Which o the following is not hydrolysed?

Which one of the following arrangements represents the correct order of electron gain enthalpy (with negative sign) of the given atomic species?

In a cyclo tri metaphosphoric acid molecule, how many single and double bonds are present?

On heating, lead nitrate forms oxides of nitrogen and lead. The oxides formed are.......

Oleum is formed when .......... is passed through conc. H₂SO₄

Complete the following chemical equation-\(H_{ g }C1_{ 2 }+PH_{ 3 }\longrightarrow \)

In the preparation of H₂SO₄ by contact process, why is SO₃ not absorbed directly in water to form H₂SO₄?

PH₃ forms bubbles when passed slowly in water but NH₃ dissolves. Explain why?

Write the conditions to maximise the yield of sulphuric acid by Contact process.

Complete the following reaction equation:
(i) XeF₄ + H₂O \(\rightarrow\)
(ii) I₂ + H₂O + Cl₂ \(\rightarrow\) 

Assign reason for each of the following:
(a) Noble gases are mostly chemically inert.
(b) Bismuth is a strong oxidising agent in pentavalent state.

Why is nitric oxide paramagnetic in gaseous state but the solid obtained on cooling it is diamagnetic?

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.

Account for the following:
(i) BiCl₃ is less covalent than PCl₃
(ii) O₃ acts as a powerful oxidising agent.
(iii) F₂ is a stronger oxidising agent than Cl₂

Account for the following:
(i) NH₃ acts as a good ligand.
(ii) H₂S is more acidic than water.

What is the action of heat on
(i) Pyrophosphoric acid
(ii) Metaphosphoric acid

On reaction with Cl₂, phosphorus forms two types of halides 'A' and 'B'.  Halide A is yellowish-white powder but halide 'B' is colourless oily liquid.  Identify A and B and write the formulas of their hydrolysis products.

An almorphous solid "A" burns in air to form a gas "B" Which turns lime water milky.  The gas is also produced as a by-product during roasting of sulphide ore.  This gas decolourises acidified aqueous KMnO₄ solution and reduces Fe³⁺ to Fe²⁺.  Identify the soild "A" and the gas "B" and write the reactions involved.

(a) Complete the following chemical equations:
(i) Cu + HNO₃(dilute) \(\rightarrow\)
(ii) XeF₄ + O₂F₂ \(\rightarrow\)
(b) Explain the following observations:
(i) Phosphorus has greater tendency for catenation than nitrogen.
(ii) Oxygen is a gas but sulphur a solid.
(iii) The halogens are coloured.  Why?

Elemental phosphorous does not exist as \(P_{ 2 }\) like  \(N_{ 2 }\) .Why?

On heating lead (II) nitrate gives a brown gas "A".  The gas "A" on cooling changes to colourless solid "B".  Solid "B" on heating with NO changes to a blue solid 'C'.  Identify 'A', 'B' and 'C' and also write reactions involved and draw the structures of 'B' and 'C'.