Which of the following on heating does not give nitrogen gas?

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?

On addition of conc.H₂SO₄ to a chloride salt, colourless fumes are evolved but in case of iodide salt, violet fumes comes out. This is because

Which of the following elements does not show allotropy?

A black compound of manganese reacts with a halogen acid to this gas reacts with NH₃ an unstable trihalide is formed. In this process the oxidation state of nitrogen changes from.....

Which of the following statements are correct?

Which of the following properties is not shown by NO ?

How many bridging atoms are present in P₄O₁₀ ?

Roasting of sulphides gives the gas X as a byproduct. This is a colourless gas with choking smell of burnt sulphur and causes great damage to respiratory organs as a result of acid rain.  Its aqueous solution is acidic, acts as a result of acid rain.  Its aqueous solution is acidic, acts as reducing agent and its acid has never been isolated.  The gas X is

Draw the structure of XeF₂ molecule.

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

Answer the following :
(i) Which neutral molecule would be isoelectronic with CIO^-?
(ii) Of Bi(V) and Sb(V) which may be a stronger oxidising agent and why?

H₃PO₃ is diprotic (or dibasic). Why?

Explain bleaching action of chlorine.

Explain why ozone is thermodynamically less stable than oxygen.

Draw the structures of the following molecules:
(i) NF₃
(ii) H₂S₂O₈
(iii) H₃PO₃

Jusity the placement of O, S, Se, Te and Po in the same group of the periodic table in terms of electronic  configuration, oxidation state and hydride formation.

(a) Draw the structures of the following:
(i) XeF₂ (ii) BrF₃
(b) Write the structural difference between white phosphorus and red phosphorus.

White phosphorus reacts with chlorine and the product hydrolyses in the presence of water.  Calculate the mass of HCl obtained by the hydrolysis of the product formed by the reaction of 62g of white phosphorus with chlorine in the presence of water.

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?

(a) Draw the structures of the following:
(i) PCl₅(s)
(ii) SO₃^2-
(b) Explain the following observations:
(i) Ammonia has a higher boiling point than phosphine.
(ii) Helium does not form any chemical compound.
(iii) Bi(V) is a stronger oxidising agent than Sb(V).