All the N--O bonds in nitrate ion (\({ NO }_{ 3 }^{ - }\)) are of equal length. Explain why?

The density of liquid CO₂ at room temperature is 0.8 g cm^-3 .how large a cartridge of liquid CO₂ must be provided to inflate a life jacket of 4 L capacity at STP?

Assign oxidation number to the underlined elements in each of the following species - KAl(SO₄)₂.12H₂O

Classify as covalent, ionic or polymeric interstitial hydrides
GeH₄

Explain why the following compounds behave as Lewis acids?
BCl₃

Draw the resonance structures for the following compounds. Show the electron shift using curved-arrow notation.
(a) C₆H₅OH
(b) C₆H₅NO₂
(c) CH₃CH = CHCHO
(d) C₆H₅-CHO
(e) C₆H₅-CH₂
(f) CH₃CH = CHCH₂

Explain the term polymerisation with two examples.

Give some examples of the achievements of green chemistry.

Correct the following electronics configuration of the elements in the ground state.
(i) \({ 1s }^{ 2 }2s^{ 1 },{ 2p }_{ x }^{ 2 },{ 2p }_{ y }^{ 2 },{ 2p }_{ z }^{ 2 },3s^{ 2 },{ 3p }_{ x }^{ 1 }\)
(ii) \({ 1s }^{ 2 }2s^{ 1 },{ 2p }_{ x }^{ 1 },{ 2p }_{ y }^{ 1 },{ 2p }_{ z }^{ 1 }\)
(iii) \({ 1s }^{ 2 }2s^{ 2 },{ 2p }^{ 6 },3s^{ 2 },{ 3p }^{ 6 },3d^{ 5 }\)
(iv) \({ 1s }^{ 2 }2s^{ 2 },{ 2p }^{ 6 },3s^{ 2 },{ 3p }^{ 6 },3d^{ 4 },4s^{ 2 }\)

Calculate the equilibrium constant for the following reaction at 298 K and 1 atm pressure
NO(g) + \(\frac { 1 }{ 2 } \)O₂(g) \(\rightleftharpoons \) NO₂(g)
Given \(\triangle { H }_{ f }^{ o }\) at 298 K are NO(g) = 90.4 KJ mol^-1
and NO₂(g) = 33.8 KJ mol^-1 , \(\triangle \)S^o at 298 K for the
reaction = -70.0 JK^-1mol^-1, R = 8.31 JK^-1mol^-1.

An organic compound containing C, H, N and O gave the following results on analysis.
On combustion, 0.42 g of substance gave \(0.924gCO_{ 2 }\) and \(0.243gH_{ 2 }O\). On distillation with caustic soda, 0.208 g of the substance \(N{ H }_{ 3 }\) is released which requires 30 mL of 0.025 M \(H_{ 2 }S{ O }_{ 4 }\)  for neutrilisation. Calculate the percentage composition of the organic compound.

Chlorine is prepared in the laboratory by treating manganese dioxide (MnO₂) with aqueous hydrochloric acid according to the reaction, 4 HCI (aq) + MnO₂(s) \(\longrightarrow \) 2H₂O(l) + MnCI₂(aq) + CI₂(g). How many grams of HCI reacts with 5.0 g of manganese dioxide?

Which is the largest in size Cu⁺,Cu²⁺ or Cu and why?

Draw the shape of the following hybrid orbitals sp, sp² and sp³.

A gas occupying a volume of 100 litres is at 20°C under a pressure of 2 bar. What temperature will it have when it is placed in an evacuated chamber of volume 175 litres? The pressure of the gas in the chamber is one-third of its initial pressure.

An equilibrium mixture at 300K contains N₂ O₄ and NO₂ at .28 and 1.1 atm pressure respectively. If the volume of the container is doubled, calculate the new equilibrium pressure of two gases.

State as to why alkali metals are prepared by electrolysis of their fused chlorides ?