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JEE-Main - 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

JEE-Main - 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

JEE-Main - 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

JEE-Main - Grade 11 - Chemistry - Chemical Bonding and Molecular Structure - Target Setup for Basic Chemical Bonding And Molecular Structure - Study ref# 661

Student requires to achieve the following milestones to get better grip over Chemical Bonding And Molecular structure. The milestones / targets are as follows:-Starting Point: Days 0Test TypeAppear on TestTarget TestsScorePractice Tes... read more

JEE-Main - 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

JEE-Main - 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

JEE-Main - Grade 11 - Chemistry - Chemical Bonding and Molecular Structure - Study ref# 1321

Write the favourable factors for the formation of ionic bond. Answer:  The favourable conditions for forming stable ionic bond are (i) Low ionization enthalpy of element forming cation. (ii) More negative electron gain enthalpy of elemen... read more

JEE-Main - 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

JEE-Main - 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

JEE-Main - 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

JEE-Main - 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

JEE-Main - 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

JEE-Main - 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

JEE-Main - Grade 11 - Chemistry - Chemical Bonding and Molecular Structure - Study ref# 1328

Use molecular orbital theory to explain why the Be2 molecule does not exist? Answer: Electronic configuration of 4Be- 1s2,2s2 Electronic configuration of Be2 molecule (4+4=8),                          read more

JEE-Main - Grade 11 - Chemistry - Chemical Bonding and Molecular Structure - Study ref# 1329

Why does the type of overlap given in the following in the following figure not result in bond formation? Answer: In the figure (I) area of ++ overlap is equal to +- overlap, so net overlap is zero, while in figure II there is no overlap du... read more

JEE-Main - 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

JEE-Main - Grade 11 - Chemistry - Chemical Bonding and Molecular Structure - Study ref# 1331

Group the given molecules as linear and non-linear molecules.   H2O,HOCl,BeCl2,Cl2O Answer: Therefore, only BeCl2 is linear and rest of the molecules are non-linear.... read more

JEE-Main - Grade 11 - Chemistry - Chemical Bonding and Molecular Structure - Study ref# 1332

(i) X,Y and Z elements have 4,5 and 7 valence electrons. Draw the structure of XH4,YH5,YH3 and H−Z. (ii) Which of these compounds has the highest dipole moment? Answer:   (ii) Z has seven electrons in its valence shell. It is the ... read more

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