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NEET - Grade 12 - Chemistry - The p-Block Elements - Introduction and Snapshot of The p-Block Elements - Study ref# 869

Introduction: In Class XI, you have learnt that the p-block elements are placed in groups 13 and 18 of the periodic table. Their valence shell electronic configuration is  (except He ... read more

NEET - Grade 12 - Chemistry - The p-Block Elements - Introduction and Snapshot of The p-Block Elements - Study ref# 870

Following sections must be covered to understand The p-Block Elements: 1. Group 15 Elements 2. Dinitrogen 3. Ammonia 4. Oxides of Nitrogen 5. Nitric Acid 6. Phosphorus – Allotropic Forms 7. Phosphine 8. Phosphorus Halide... read more

NEET - Grade 11 - Chemistry - The p-block elements - Importance and Snapshot of P Block Element - Study ref# 680

Introduction: In p-block elements the last electron enters the outermost p orbital. As we know that the number of p orbitals is three and, therefore, the maximum number of electrons that can be accommodated in a set of p-orbitals is si... read more

NEET - Grade 11 - Chemistry - The p-block elements - Importance and Snapshot of P Block Element - Study ref# 681

Following sections must be covered to understand the p-Block Elements: 1. Group 13 Elements : The Boron Family 2. Important Trends and Anomalous Properties of Boron 3. Some Important Compounds of Boron 4. Users of Boron and Alumi... read more

NEET - Grade 11 - Chemistry - The p-block elements - Target Setup for P Block Element - Study ref# 682

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

NEET - Grade 12 - Chemistry - The p-Block Elements - Target Setup for The p-Block Elements - Study ref# 871

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

NEET - Grade 11 - Chemistry - The p-block elements - Study ref# 2115

Why does Boron trifluride behave as a Lewis acid? Answer: BF3 being electron deficient, is a strong Lewis acid. It reacts with Lewis bases easily to complete the octet around boron.   HINT: Lewis acids have a tendency to except electrons,... read more

NEET - Grade 11 - Chemistry - The p-block elements - Study ref# 2116

Explain what happens when boric acid is heated? Answer: Boric acid, on heating loses water in three different temperatures ultimately giving boron trioxide.   ... read more

NEET - Grade 11 - Chemistry - The p-block elements - Study ref# 2118

Write the reaction of justify amphoteric nature of aluminium. Answer: As dissolves both in acids and alkalies evolving dihydrogen and thus, shows amphoteric nature.                        ... read more

NEET - Grade 11 - Chemistry - The p-block elements - Study ref# 2119

Write the resonance structures of    and Answer: Resonance structure of  ion:   Resonance structure of  ion:   ... read more

NEET - Grade 11 - Chemistry - The p-block elements - Study ref# 2120

Suggest reason why the B -----F bond lengths in BF3 (130 pm) and  (143 pm) differ? Answer: In BF3, boron is sp2 hybridized. It has a vacant 2p-orbital.Each fluorine in BF3 has completely filled unutilized 2p-orbitals. Since, both of these... read more

NEET - Grade 11 - Chemistry - The p-block elements - Study ref# 2123

How would you explain the lower atomic radius of Ga as compared to aluminium? Answer: Electronic configuration of Al and Ga are as   The screening tendency of d-electrons is poor. Thus, on moving from Al to Ga, shielding effect of 10d-electr... 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# 2126

Draw the structures of BCl3. NH3 and AlCl3 (dimer). Answer:   ... read more

NEET - Grade 11 - Chemistry - The p-block elements - Study ref# 2127

Give reason for the following. CCl4 is immiscible in water, whereas SiCl4 is easily hydrolyzed. Answer: Carbon tetrachloride (CCl4) is a covalent compound while H2O is a polar compound and CCl4 does not form H - bond with water molecule. ... 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 12 - Chemistry - The p-Block Elements - Study ref# 9814

On addition of conc.to a chloride salt, colourless fumes are evolved but in case of iodide salt, violet fumes come out. This is because (a) reduces to HI to I2 (b) HI of violet colou... read more

NEET - Grade 12 - Chemistry - The p-Block Elements - Study ref# 9816

Which of the following pairs of ions are isoelectronic and isostructural? (a)   (b) (c) read more

NEET - Grade 12 - Chemistry - The p-Block Elements - Study ref# 9817

Affinity for hydrogen decreases in the group from fluorine to iodine. Which of the halogen acids should have highest bond dissociation enthalpy? (a) HF (b) HCI (c) HBr (d) HI Answer: read more

NEET - Grade 12 - Chemistry - The p-Block Elements - Study ref# 9818

On heating with concentrated NaOH solution in an inert atmosphere of CO2, white phosphorus gives a gas. Which of the following statement is incorrect about the gas? (a) It is highly poisonous and has smell like rotten fish. (b) It’solu... 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 - The p-Block Elements - Study ref# 9821

A brown ring is formed in the ring test for  ion. It is due to the formation of (a)   (b)   (c) read more

NEET - Grade 12 - Chemistry - The p-Block Elements - Study ref# 9822

Which of the following is not tetrahedral in shape? (a)   (b) (c) (d) read more

NEET - Grade 12 - Chemistry - The p-Block Elements - Study ref# 9823

In the preparation of compounds of Xe, Bartlett had taken  as a base compound. This is because   (a) both O2 and Xe have same size. (b) both O2 and Xe have same electron gain enthalpy. (c) both O2 and Xe have almost same ioni... read more

NEET - Grade 12 - Chemistry - The p-Block Elements - Study ref# 9824

Which of the following is isoelectronic pair? (a)   (b)   (c) (d) read more

NEET - Grade 12 - Chemistry - The p-Block Elements - Study ref# 9825

Which of the following statements are correct? (a) All the three N – O bond lengths in are equal. (b) All P – Cl bond lengths in PCl5 molecule in gaseous state are equal. (c) P4 molecule in white phosphorus have regular strain there... read more

NEET - Grade 12 - Chemistry - The p-Block Elements - Study ref# 9826

Which of the following statements are correct? (a) S – S bond is present in   (b) In peroxosulphuric acid Sulphur is in +6 oxidation state (c) Iron powder along with  and K2O is used as catalyst in the preparation of NH3 by Haber’s ... read more

NEET - Grade 12 - Chemistry - The p-Block Elements - Study ref# 9827

In the preparation of by contact process, why is  not absorbed directly in water to form? Answer: In contact proces... read more

NEET - Grade 12 - Chemistry - The p-Block Elements - Study ref# 9828

Write a balanced chemical equation for the reaction showing catalytic oxidation of by atmospheric oxygen. Answer: Ammonia () on catalytic by ... read more

NEET - Grade 12 - Chemistry - The p-Block Elements - Study ref# 9829

In, phosphorus is in hybridized state but all its five bonds are not equivalent. Justify your answer with reason. Answer: It has trigonal bipyramidal geometry, in which two Cl atoms occupy axi... read more

NEET - Grade 12 - Chemistry - The p-Block Elements - Study ref# 9830

Why is nitric oxide paramagnetic in gaseous state but the solid obtained on cooling it is diamagnetic? Answer: In gaseous state, NO2 exists as a monomer which has one unpaired electron but in solid state, it dimerises to N2O4 so no unpaired ... read more

NEET - Grade 12 - Chemistry - The p-Block Elements - Study ref# 9831

Give one reason to explain why exists butdoes not exist? Answer: Existence of and  can be explained on the basis of size of central atom. Because fluorine is electronegative as compared to chl... read more

NEET - Grade 12 - Chemistry - The p-Block Elements - Study ref# 9832

Out of and, which one has higher bond angle and why? Answer: Bond angle  of (H – O – H = 104.5̊) is larger than that of read more

NEET - Grade 12 - Chemistry - The p-Block Elements - Study ref# 9833

is known but is not. Why? Answer: Fluorine atom is smaller in size so, six F- ions can surround a Sulphur atom. The case is not so with chlorine atom due to its large size. So, read more

NEET - Grade 12 - Chemistry - The p-Block Elements - Study ref# 9834

In the ring test of ion, ion reduces nitrate ion to nitric oxide, which combines with (aq) ion to form brown complex. Write the reactions involved in the formation of brown ring. Answer: read more

NEET - Grade 12 - Chemistry - The p-Block Elements - Study ref# 9835

Explain why ozone is thermodynamically less stable than oxygen? Answer: Ozone is thermodynamically less stable than oxygen because its decomposition into oxygen results in the liberation of heat (is negative) and an increase in entropy (i... read more

NEET - Grade 12 - Chemistry - The p-Block Elements - Study ref# 9836

Name three oxoacids of nitrogen. Write the disproportionation reaction of that oxoacid of nitrogen in which nitrogen is in + 3 oxidation state. Answer: Three oxoacids of nitrogen having oxidation state +3 are (a) HNO2 , nitrous acid (... read more

NEET - Grade 12 - Chemistry - The p-Block Elements - Study ref# 9837

PCl5 reacts with finely divided silver on heating and a white silver salt is obtained, which dissolves on adding excess aqueous NH3 solution. Write the reactions involved to explain what happens. Answer: PCl5 reacts with finely divided si... read more

NEET - Grade 12 - Chemistry - The p-Block Elements - Study ref# 9838

Match the species given in Column I with the shape given in Column II and mark the correct option. read more

NEET - Grade 12 - Chemistry - The p-Block Elements - Study ref# 9839

Match the items in Column I and Column II and mark the correct option.   Column I... read more

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