Which of the following elements exhibits the most basic properties?

• F

• Cl

• Br

• I

Which of the following sulphate is insoluble in water?

• CuSO₄

• CdSO₄

• PbSO₄

• Bi₂(SO₄)₃

A deep brown gas is formed by mixing two colourless gases which are

• NO₂ and O₂

• N₂O and NO

• NO and O₂

• NH₃ and HCl

In the nitrogen family the H-M-H bond angle in the hydrides (MH₃ ) gradually becomes closer to 90° on going from N to Sb. This shows that

• the basic strength of hydrides increases

• the bond energies of M-H bonds increases

• almost pure p-orbitals are used for M-H bonding

• the bond pairs of electrons come nearer to the central atom

Which of the following, on heating with ammonia gives urotropin?

• Formaldehyde

• Acetaldehyde

• Acetone

• Benzaldehyde

196.

Which one of the following will give a white precipitate with AgNO₃ in aqueous medium?

• [Co(NH₃)₂Cl] (NO₂)₂

• [Pt(NH₃)₂Cl₂]

• [Pt(en) Cl₂]

• [Pt(NH₃)₄]Cl₂

Which one of the following sulphide is yellow?

• Zinc sulphide

• Cadmium sulphide

• Nickel sulphide

• Lead sulphide

In the mixture of conc. H₂SO₄ and HNO₃ the nitration species is

• N₂O₄

• NO₂⁺

• NO₂

• NO₂^-

A mixture containing Cu²⁺ and Ni²⁺ can be separated for identification by

• passing H₂S in acid medium

• passing H₂S in alkaline medium

• passing H₂S in neutral medium

• passing H₂S in dry mixture

Chlorine cannot displace

• fluorine from NaF

• iodine from NaI

• bromine from NaBr

• None of the above