91Ó°ÊÓ

The acid which has a peroxy linkage is (a) Dithionic acid (b) Sulphurous acid (c) Caro's acid (d) Pyrosulphuric acid

Ammonia reacts with sodium hypochlorite to give: (a) \(\mathrm{N}_{2} \mathrm{O}\) (b) \(\mathrm{N}_{2}\) (c) \(\mathrm{NH}_{2} \mathrm{OH}\) (d) \(\mathrm{H}_{2} \mathrm{~N} \cdot \mathrm{NH}_{2}\)

Welding of magnesium can be done in an atmosphere of: (a) \(\mathrm{He}\) (b) \(\mathrm{O}_{2}\) (c) \(\mathrm{Xe}\) (d) \(\mathrm{Kr}^{2}\)

The configuration of inert gas with smallest size and highest I.E. is: (a) \(1 \mathrm{~s}^{2}\) (b) \(1 \mathrm{~s}^{2} 2 \mathrm{~s}^{2} 2 \mathrm{p}^{6}\) (c) \(1 \mathrm{~s}^{2} 2 \mathrm{~s}^{2} 2 \mathrm{p}^{5}\) (d) \(1 \mathrm{~s}^{2} 2 \mathrm{~s}^{2} 2 \mathrm{p}^{6} 3 \mathrm{~s}^{2} 3 \mathrm{p}^{6}\)

Bond dissociation energies of HF, HCl, HBr follows the order \(\ldots \ldots\) (a) \(\mathrm{HBr}>\mathrm{HCl}>\mathrm{HF}\) (b) \(\mathrm{HCl}>\mathrm{HBr}>\mathrm{HF}\) (c) \(\mathrm{HF}>\mathrm{HBr}>\mathrm{HCl}\) (d) \(\mathrm{HF}>\mathrm{HCl}>\mathrm{HBr}\)

Which of the following does not exhibit allotropy? (a) As (b) Sb (c) \(\mathrm{Bi}\) (d) \(\mathrm{P}\)

Which of the following is most stable? (a) HI (b) \(\mathrm{HCl}\) (c) \(\mathrm{HBr}\) (d) HF

Which of the following form of sulphur can be prepared by pouring liquid sulphur into cold water? (a) Colloidal (b) Plastic (c) Monoclinic (d) Rhombic

Red phosphorus is less reactive than yellow phosphorus because: (a) It is hard. (b) It is insoluble in \(\mathrm{C}_{2} \mathrm{H}_{5} \mathrm{OH}\). (c) It is red in colour. (d) It is highly polymerized.

Which one of the sixth group elements has the highest catenation power? (a) \(\mathrm{O}\) (b) \(\mathrm{S}\) (c) Se (d) \(\mathrm{Te}\)