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NEET - Grade 12 - Physics - Dual Nature of Radiation and Matter - Introduction and Snapshot of Dual Nature of Radiation and Matter - Study ref# 836

Introduction: The Maxwell’s equations of electromagnetism and Hertz experiments on the generation and detection of electromagnetic waves in 1887 strongly established the wave nature of light. Towards the same period at the end of 19th ... read more

NEET - Grade 12 - Physics - Atoms - Introduction and Snapshot of Atoms - Study ref# 839

Introduction: By the nineteenth century, enough evidence had accumulated in favour of atomic hypothesis of matter. In 1897, the experiments on electric discharge through gases carried out by the English physicist J.J. Thomson (1856 - 1... read more

NEET - Grade 12 - Chemistry - Biomolecules - Introduction and Snapshot of Biomolecules - Study ref# 890

Introduction: A living system grows, sustains and reproduces itself. The most amazing thing about a living system is that it is composed of non-living atoms and molecules. The pursuit of knowledge of what goes on chemically within a li... read more

NEET - Grade 12 - Chemistry - The Solid State - Introduction and Snapshot of The Solid State - Study ref# 852

Following sections must  be covered to understand The Solid State: 1. General Characteristics of Solids State 2. Amorphous and Crystalline Solids 3. Classification of Crystalline Solids 4. Crystal Lattices and Unit Cells 5. Nu... read more

NEET - Grade 12 - Chemistry - Coordination Compounds - Introduction and Snapshot of Coordination Compounds - Study ref# 875

Introduction: In the previous Unit we learnt that the transition metals form a large number of complex compounds in which the metal atoms are bound to a number of anions or neutral molecules. In modern terminology such compounds are ca... read more

NEET - Grade 11 - Chemistry - Some Basic Concepts of Chemistry - Importance and Snapshot of Basic Concepts of Chemistry - Study ref# 650

Introduction: Chemistry deals with the composition, structure and properties of matter. These aspects can be best described and understood in terms of basic constituents of matter: atoms and molecules. That is why chemistry is calle... read more

NEET - Grade 11 - Chemistry - Structure of Atom - Importance and Snapshot of Structure of Atoms - Study ref# 653

Introduction: The existence of atoms has been proposed since the time of early Indian and Greek philosophers (400 B.C.) who were of the view that atoms are the fundamental building blocks of matter. According to them, the continued sub... read more

NEET - Grade 11 - Chemistry - Structure of Atom - Importance and Snapshot of Structure of Atoms - Study ref# 654

Following sections must be covered to understand Structure of Atoms: 1. Sub-atomic Particles 2. Atomic Models 3. Development Leading to the Bohr’s Model of Atom 4. Bohr’s Model for Hydrogen Atom 5. Towards Quantum Mechanical Mode... read more

NEET - Grade 11 - Chemistry - Structure of Atom - Target Setup for Structure of Atoms - Study ref# 655

Student requires to achieve the following milestones to get better grip over Structure of Atoms. The milestones / targets are as follows:-Starting Point: Days 0Test TypeAppear on TestTarget TestsScorePractice Test000%Chapter Test000%S... read more

NEET - Grade 11 - Chemistry - Chemical Bonding and Molecular Structure - Importance and Snapshot of Chemical Bonding And Molecular Structure - Study ref# 659

Introduction: Matter is made up of one or different type of elements. Under normal conditions no other element exists as an independent atom in nature, except noble gases. However, a group of atoms is found to exist together as one spe... read more

NEET - Grade 11 - Chemistry - Chemical Bonding and Molecular Structure - Importance and Snapshot of Chemical Bonding And Molecular Structure - Study ref# 660

Following sections must be covered to understand Chemical Bonding And Molecular Structure: 1. Kossel-Lewis Approach to Chemical Bonding. 2. Ionic or Electrovalent Bond 3. Bond Parameters 4. The Valence Shell Electron Pair Repulsion(... read more

NEET - Grade 11 - Chemistry - Hydrogen - Importance and Snapshot of Hydrogen - Study ref# 674

Introduction: Hydrogen has the simplest atomic structure among all the elements around us in Nature. In atomic form it consists of only one proton and one electron. However, in elemental form it exists as a diatomic [] molecule and is ... read more

NEET - Grade 11 - Biology - Plant Kingdom - Importance and Snapshot of Plant Kingdom - Study ref# 743

Introduction: In this chapter, we will deal in detail with further classification within Kingdom Plantae popularly known as the ‘plant kingdom’. Let us look at classification within angiosperms to understand some of the concerns that i... read more

NEET - Grade 11 - Biology - Anatomy of Flowering Plants - Importance and Snapshot of Anatomy of Flowering Plants - Study ref# 752

Introduction: You can very easily see the structural similarities and variations in the external morphology of the larger living organism, both plants and animals. Similarly, if we were to study the internal structure, one also finds s... read more

NEET - Grade 11 - Biology - Transport in Plants - Importance and Snapshot of Transport In Plants - Study ref# 767

Introduction: Have you ever wondered how water reaches the top of tall trees, or for that matter how and why substances move from one cell to the other, whether all substances move in a similar way, in the same direction and whether me... read more

NEET - Grade 11 - Chemistry - Structure of Atom - Study ref# 1203

Calculate the total number of electrons present in one mole of methane. Answer: 1 molecule of  methane () contains 6+4=10 electrons                                                        ... read more

NEET - Grade 11 - Chemistry - Structure of Atom - Study ref# 1204

Find (a) the total number and (b) the total mass of neutrons in 7 mg of (Assume that mass of a neutron=1.675×kg.) Answer: (a) 1 mol =14 g=6.022× carbon atomsNumber of neutrons in 1 carbon atom     &nb... read more

NEET - Grade 11 - Chemistry - Structure of Atom - Study ref# 1205

Find (a) the total number and (b) the total mass of  protons in 34 mg of  at STP.(Mass of 1 p=kg)  Will the answer change if the temperature and pressure are changed? Answer: 1 mole of   contains protons=7+3=10 moles of protons (7 in N... read more

NEET - Grade 11 - Chemistry - Structure of Atom - Study ref# 1206

Calculate the wavelength , frequency and wave number of a light wave whose period is s. Answer: Frequency , v= 1 / Time Period                                &n... read more

NEET - Grade 11 - Chemistry - Structure of Atom - Study ref# 1207

Which of the following are isoelectronic species, i.e., those having the same number of electrons?                                       Answer: Isoelectronic species have the same number of electrons but different atomic numbers Calculat... read more

NEET - Grade 11 - Chemistry - Structure of Atom - Study ref# 1208

What is the lowest value of n that allows g orbitals to exist? (i) Value of l=0 to (n-1) (ii) l=0 means orbital, l=1 means p orbitals, l=2 means d orbitals, l=3 means f orbitals and l=4 means g orbitals Answer: For g subshell l=4 and to have... read more

NEET - Grade 11 - Chemistry - Structure of Atom - Study ref# 1209

An electron is in one of the 3d-orbitals. Give the possible values of n, l and ml for this electron. (i) For s, p, d and f orbitals, value of l is 0, 1, 2 and 3 respectively. (ii) ml =-l to +l including 0. Answer: For 3d-electron,n=3, l=... read more

NEET - Grade 11 - Chemistry - Structure of Atom - Study ref# 1210

Show that circumference of the Bohr orbit for the hydrogen atom is an integral multiple of the de-Broglie wavelength associated with the electron revolving around the orbit. Answer: According to Bohr model for H-atom, the angular momentum o... read more

NEET - Grade 11 - Chemistry - Structure of Atom - Study ref# 1211

What transition in the hydrogen spectrum would have the same wavelength as the Balmer transition n=4 to n =2 of He+ spectrum? (i) Since, the  of He+ is same as that of   of H, find the value of  of He+ spectrum f... read more

NEET - Grade 11 - Chemistry - Structure of Atom - Study ref# 1212

In Rutherford’s experiment, generally the thin foil of heavy atoms, like gold, platinum, etc., have been used to be bombarded by the ∝- particles. If the thin foil of light atoms like aluminium, etc., is used, what difference would ... read more

NEET - Grade 11 - Chemistry - Structure of Atom - Study ref# 1213

Neon gas is generally used in sign boards. If it emits strongly at 616 nm, calculate (a)the frequency of emission (b) distance travelled by this radiation in 30 s. (c) energy of quantum. (d) number of quanta present if it produces 2J o... read more

NEET - Grade 11 - Chemistry - Structure of Atom - Study ref# 1214

If the position of the electron is measured within an accuracy of ±0.002 nm, calculate the uncertainty in the momentum of the electron. Suppose the momentum of the electron is , is there any problem in defining this value. Answer: &#... read more

NEET - Grade 11 - Chemistry - Structure of Atom - Study ref# 1215

Arrange s, p and d- subshells of a shell in the increasing order of the effective nuclear charge (Zeff) experienced by the electron present in them. Answer: s-orbital is spherical in shape, it shields the electrons from the nucleus more effe... read more

NEET - Grade 11 - Chemistry - Structure of Atom - Study ref# 1216

Show the distribution of electrons in oxygen atom(atom number 8) using orbital diagram Answer: 8O= 1s2                  2s2                    2p4  ... read more

NEET - Grade 11 - Chemistry - Structure of Atom - Study ref# 1217

Which of the following orbitals are degenerate?                                           Answer: The orbitals which belong to same subshell and same shell are called degenerate orbitals. () and  are the two sets of degenerate orbitals. ... read more

NEET - Grade 11 - Chemistry - Structure of Atom - Study ref# 1218

Why was a change in the Bohr model of atom required, due to which important development(s), concept of movement of an electron in an orbit was replaced by the concept of probability of finding electron in an orbital? What is the name given t... read more

NEET - Grade 11 - Chemistry - Chemical Bonding and Molecular Structure - Study ref# 1319

Explain the formation of chemical bond. Answer: Kossel and Lewis approach to chemical bonding was based on the inertness of noble gases. Inertness of noble gases is due to the presence of 8 electrons in their outermost shell (called octet) exce... read more

NEET - Grade 11 - Chemistry - Chemical Bonding and Molecular Structure - Study ref# 1320

Write the Lewis structure for the following atoms and ions S and S-2; Al and Al3+; H and H-. Answer:                           Lewis symbol=        Lewis symbol=                              Lewis symbol=   electrons; Lewis s... read more

NEET - Grade 11 - Chemistry - Chemical Bonding and Molecular Structure - Study ref# 1322

Discuss the shape of the following molecules using the VSEPR model.  BeCl2, BCl3, SiCl4, AsF5,H2S,PH3 Answer:  According to VSEPR theory, the shape of a molecule depends upon the number of valence shell electron pairs (bonded or non-bonde... read more

NEET - Grade 11 - Chemistry - Chemical Bonding and Molecular Structure - Study ref# 1323

Explain the important aspects of resonance with reference to the  ion. Answer: When a single Lewis structure of a molecule cannot describe its all properties, a number of structures, called canonical structures, are written. The actual s... read more

NEET - Grade 11 - Chemistry - Chemical Bonding and Molecular Structure - Study ref# 1324

Write the resonance structures for SO3, NO2 and. Answer:  Sulphur trioxide, SO3   Nitrogen dioxide,NO2 Nitrate ion, NO-3   Hints: Draw the possible structures in which octet (duplet in case of H) ... read more

NEET - Grade 11 - Chemistry - Chemical Bonding and Molecular Structure - Study ref# 1325

Apart from tetrahedral geometry, another possible geometry for CH4 is square planar with the four H-atoms at the corners of the square and the C atom at its centre. Explain, why CH4 is not square planar? Answer: Electronic configuration of c... read more

NEET - Grade 11 - Chemistry - Chemical Bonding and Molecular Structure - Study ref# 1326

What is meant by hybridization of atomic orbitals? Describe the shape of sp,sp2 and sp3 hybrid orbitals. Answer: Hybridization To explain the shape of polyatomic molecules like CH4,H2O, etc., Pauling introduced the concept of hybridization. ... read more

NEET - Grade 11 - Chemistry - Chemical Bonding and Molecular Structure - Study ref# 1327

Draw diagrams showing the formation of a double bond and a triple bond between the carbon atoms in C2H4 and C2H2. Answer: Formation of C2H4(ethylene)                                                                                        ... read more

NEET - Grade 11 - Chemistry - Chemical Bonding and Molecular Structure - Study ref# 1330

In both water and dimethyl ether, oxygen atom is central atom, and has the same hybridization, yet they have different bond angles. Which one has the greater bond angle? Give reason.  Answer... read more

NEET - Grade 11 - Chemistry - Hydrocarbons - Study ref# 1746

Propanal and pentane-3-one are the ozonolysis products of an alkene? What is the structural formula of the alkene? Answer: Hints: Write the structures of the products of ozonolysis in such a way that their oxygen atoms pointing toward... read more

NEET - Grade 11 - Chemistry - Hydrocarbons - Study ref# 1747

Why is benzene extra ordinary stable though it contains three double bonds? Answer: Resonance and delocalization of electrons generally leads to the stability of benzene molecule. The dotted circle in the hybride structure represents the... read more

NEET - Grade 11 - Chemistry - Redox Reactions - Study ref# 2077

What are the oxidation numbers of the underlined elements in each of the following and how do you rationalize your result? Answer:  Therefore, the average oxidation number of C is Zero. Let us consider the structure of CH3COOH &... read more

NEET - Grade 11 - Chemistry - The p-block elements - Study ref# 2124

What are allotrops? Sketch the structure of allotrops of carbon mamely diamond and graphite. What is the impact of structure on physical properties of two allotrops? Answer: The phenomenon of existence of an element in two or more forms whic... read more

NEET - Grade 11 - Chemistry - The p-block elements - Study ref# 2129

Explain the following. CO2 is a gas whereas SiO2 is a solid. Answer: CO2 has a linear structure. Its dipole moment is zero. It is believed that CO2 molecule is a resonance hybrid of following structures                sp hybridised ... read more

NEET - Grade 11 - Biology - Plant Kingdom - Study ref# 3526

What is strobilus in plants like Selaginella? Answer: A strobilus (plural strobili) is an organ of many plants that contains the reproductive structures. Strobili are ordinarily called cones in many of these groups. Strobili are characterized by a ce... read more

NEET - Grade 11 - Biology - Anatomy of Flowering Plants - Study ref# 3889

What is trichomes? Answer: Trichomes are fine outgrowths or appendages on plants and protists. These are of diverse structure and function. Examples are hairs, glandular hairs, scales, and papillae. A common type of trichome is a hair.... read more

NEET - Grade 11 - Biology - Anatomy of Flowering Plants - Study ref# 3902

What is stomatal apparatus? Explain the structure of stomata with label diagram? Answer: The stomatal aperture, guard cells and the surrounding epidermal cells together forms stomatal apparatus.Stomata consist of an opening or stomatal pore, and two ... read more

NEET - Grade 11 - Biology - Anatomy of Flowering Plants - Study ref# 3904

What do you understand by monocotyledons and dicotyledons. Describe the structure of any one. Answer: Monocotyledons – When the embryo of a seed is made up of a radicle, an embryonal axis and only one cotyledon, then such seeds are calledmonocot... read more

NEET - Grade 12 - Chemistry - The Solid State - Study ref# 9688

Which of the following is not true about the ionic solids? (a)  Bigger  ions from the close packed structure (b) Smaller ions occupy either the tetrahedral or the octahedral voids depending upon their size (c)  Oc... read more

NEET - Grade 12 - Chemistry - The Solid State - Study ref# 9689

The number of tetrahedral voids per unit cell in NaCl crystal is……..  . (a)  4 (b) 8 (c)  Twice the number of octahedral voids (d) Four times the number of octahedral voids Answer: (b, c) NaCl as a... read more

NEET - Grade 12 - Chemistry - The Solid State - Study ref# 9696

Assertion (A) the packing efficiency is maximum for the fcc structure. Reason (R) the coordination number is 12 in fcc structures. (a)  Assertion and reason both are correct statement and reason is correct explanation for asser... read more

NEET - Grade 12 - Chemistry - The Solid State - Study ref# 9697

With the help of a labeled diagram show that there are four octahedral voids per unit cell in a cubic close packed structure. Answer: Cubic close packed structure contains one atom at each of eight corners of unit cell and one atom at eac... read more

NEET - Grade 12 - Chemistry - The p-Block Elements - Study ref# 9819

Which of the following acids form three series of salts? (a)   (b) (c) (d) read more

NEET - Grade 12 - Chemistry - Haloalkanes and Haloarenes - Study ref# 9925

Which of the following compounds can be classified as aryl halides? a)      b)      c)      d)     Hint: To solve t... read more

NEET - Grade 12 - Chemistry - Biomolecules - Study ref# 10015

Structure of disaccharide formed by glucose and fructose is given below. Identify anomeric carbon atoms in monosaccharide units. (a) ‘a’ carbon of glucose and ‘a’ carbon of fructose (b) ‘a’ carbon of glucose and ‘e’ carbon of fr... read more

NEET - Grade 12 - Biology - Evolution - Study ref# 10224

Why are analogous structures, a result of convergent evolution?                      [U][Outside Delhi set-II, 2014] Answer: Analogous structures are a result of convergent evolution because they are not anatomically similar structures th... read more

NEET - Grade 12 - Biology - Evolution - Study ref# 10229

Explain with the help of an example the type of evolution homology is based on?                      [A][Delhi set-II, Comptt.2015] Answer: Homology is based on divergent evolution. These have similar anatomical structure but perform diff... read more

NEET - Grade 12 - Biology - Evolution - Study ref# 10231

State the evolutionary relationship giving reasons between the thorn of Bougainvillea and tendril of cucurbit.          [U][Outside Delhi set-I, Comptt.2015] Answer: Divergent evolution/ Homologous organs. Similar in origin but perform di... read more

NEET - Grade 12 - Biology - Evolution - Study ref# 10236

How domologous represent divergent evolution? Explain with the help of a suitable example.                     [A][Outside Delhi set-III 2016] Answer: Organs with similar structure/same ancestry/ anatomically same/same origin developed al... read more

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