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

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

The formation of O₂⁺[PtF₆]^- is the basis for the formation of xenon fluorides. This is because

Affinity for hydrogen decreases in the group from fluorine to iodine. Which of the halogen acids should have highest bond dissociation enthalpy?

Which of the following elements does not show allotropy?

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

Explain the following the following facts giving appropriate reason in each case:
(i) NF₃ is an exothermic compound whereas NCL₃ is not.
(ii) All the bonds in SF₄ are not equivalent.

Account the following :
(i) Thermal stability of water is much higher than that of H₂S.
(ii) White phosphorus is more reactive than red phosphorus.

Complete the following chemical reaction equations:
(i) Xe(g) + F₂(g)\(\underset { (in\ excess) }{ F_{2}(g) } \) \(\xrightarrow [7 bar]{873\ K}\)
(ii) Li + N₂  \(\rightarrow\)

Nitric acid forms an oxide of nitrogen on reaction with P₄O₁₀.  Write the reaction involved. Also wirte the resonating structure of the oxide of nitrogen formed.

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

Phosphorus has three allotropic forms -    
(i) white phosphorus    
(ii) red phosphorus and    
(iii) black phosphorus.  
Write the difference between white and red phosphorus on the basis of their structure and reactivity.

(a) Complete the following chemical reaction equations:
(i) \({ I }^{ - }(aq)+{ H }_{ 2 }O(l)+{ O }_{ 3 }(g)\) \(\rightarrow\)
(ii) P₄ (s) + NaOH (aq) + H₂O (l) \(\rightarrow\)
(b) Explain the following observations:
(i) H₂S is less acidic than H₂Te.
(ii) Fluorine is a stronger oxidising agent than chlorine.
(iii) Noble gases are the least reactive elements.

On heating compound (A) gives a gas (B) which is a constituent of air.  This gas when treated with 3 mol of hydrogen (H₂) in the presence of a catalyst gives another gas (C) Which is basic in nature.  Gas C on further oxidation in moist condition gives a compound (D) which is a part of acid rain.  Identify compound (A) to (D) and also give necessary equations of all the steps involved.