Which of the following is used in estimation of carbon monoxide?

• I₂O₄

• BrO₃

• Cl₂O₇

• I₂O₅

Which one ofthe following statements is not correct?

• In CO₂ molecule, carbon hybridisation is sp

• Fullerenes are made by heating graphite in an electric are in the presence of argon gas

• Both [SiF₆]^2- and [SiCl₆]^2- ions are known

• In CO molecule, there are one 'sigma' and two "pi" bonds

Which of the following is the anhydride of nitric acid?

• NO

• NO₂

• N₂O₃

• N₂O₅

Chlorine atom differs from chloride in the number of which of the following?

• Protons

• Neutrons

• Electrons

• Both (a) and (c)

In the following reaction,

P₄ + 3NaOH + 3H₂O → PH₃ + 3NaH₂PO₂

• phosphorus is oxidised

• phosphorus is oxidised and reduced

• phosphorus is reduced

• sodium is oxidised

956.

Which of the following does not have the hydrogen bond?

• Phenol

• Liquid NH₃

• Water

• Liquid HCl

Fluorine forms chemical compounds with

• He

• Ne

• Ar

• Xe

The passivity of iron in concentrated nitric acid is due to

• ferric nitrate coating on the metal

• ammonium nitrate coating on the metal

• a thin oxide layer coating on the metal

• a hydride coating on the metal

Phosgene is common name of

• carbon dioxide and phosphene

• phosphoryl chloride

• carbonyl chloride

• carbon tetrachloride

Which of the following inert gas is soluble in water?

• He

• Ne

• Ar

• Xe