The p-Block Ele...

Reduction potentials of some ions are given below. Arrange them in decreasing order of oxidising power.

Which of the following is isoelectronic pair?

Which of the following statements are correct for \(SO_2\) gas?

(i) It acts as bleaching agent in moist conditions.

(ii) It’s molecule has linear geometry.

(iii) It’s dilute solution is used as disinfectant.

(iv) It can be prepared by the reaction of dilute \(H_2SO_4\) with metal sulphide.

Which of the following statements are correct?

(i) All the three N—O bond lengths in \(HNO_3\) are equal.

(ii) All P—Cl bond lengths in \(PCl_5\) molecule in gaseous state are equal.

(iii) \(P_4\) molecule in white phohsphorus have angular strain therefore white phosphorus is very reactive.

(iv) \(PCl_5\) is ionic in solid state in which cation is tetrahedral and anion is octahedral.

Hot conc. \(H_2SO_4\) acts as moderately strong oxidising agent. It oxidises both metals and nonmetals. Which of the following element is oxidised by conc. \(H_2SO_4\) into two gaseous products?

Which of the following orders are correct as per the properties mentioned against each?

(i) \(As_2O_3 < SiO_2 < P_2O_3 < SO_2\)  Acid strength.

(ii) \(AsH_3 < PH_3 < NH_3\)  Enthalpy of vapourisation.

(iii) S < O < Cl < F  More negative electron gain enthalpy.

(iv) \(H_2O > H_2S > H_2Se > H_2 Te\)  Thermal stability.

In which of the following reactions conc. \(H_2SO_4\) is used as an oxidising reagent?

(i) \(CaF_2 + H_2SO_4 \rightarrow CaSO_4 + 2HF \)

(ii) \(2HI + H_2SO_4 \rightarrow I_2 + SO_2 + 2H_2O \)

(iii) \(Cu + 2H_2SO_4 \rightarrow CuSO_4 + SO_2 + 2H_2O \)

(iv) \(NaCl + H_2SO_4 \rightarrow NaHSO_4 + HCl\)

Assertion : NaCl reacts with concentrated \(H_2 SO_4\) to give colourless fumes with pungent smell. But on adding \(MnO_2\) the fumes become greenish yellow.

Reason : \(MnO_2\) oxidises HCl to chlorine gas which is greenish yellow.