A silver iodide sol has been prepared by adding slight excess of KI solution to AgNO₃ solution having the same concentration as that of KI solution. The silver iodide sol particles are

• positively charged

• negatively charged

• neutral

• partially positively and partially negatively charged

P₄O₁₀ on reacting with water does not form

• tetrametaphosphoric acid

• phosphorus acid

• orthophosphoric acid

• pyrophosphoric acid

Chlorine reacts with carbon disulphide in presence of I₂ catalyst to form

• CHCl₃

• CHI₃

• CCl₄

• C₂H₅Cl

Aqueous solution of Na₂SO₃ on reaction with Cl₂ gives

• Na₂S₄O₆

• NaOH

• NaHSO₄

• NaCl

The electronic configuration of P in H₃PO₄

• 1s² 2s², 2p⁶, 3s² 3p⁶

• 1s², 2s², 2p⁶ 3s²

• 1s², 2s² 2p⁶

• 1s², 2s², 2p⁶,3s² 3p³

216.

In which one of the following reactions, nitrogen is not reduced?

• NO₂ → NO${}_2^{-}$

• ${\mathrm{NO}}_3^{-} \to \mathrm{NO}$

• ${\mathrm{NO}}_3^{-} \to {\mathrm{NH}}_4^{+}$

• ${\mathrm{NH}}_4^{+} \to {\mathrm{N}}_2$

Which of the following metal is leached by cyanide process?

• Na

• Cu

• Ag

• Fe

The correct order of electron gain enthalpy with negative sign is

• S <O <Cl < F

• O <S < F < Cl

• Cl <F <S <O

• F <Cl <O < S

Which gas behaves abnormally when liquified?

• Xenon

• Krypton

• Helium

• Argon

Which statement is false for white phosphorus (P₄)?

• It has six P-P single bonds

• It has four P-P single bonds

• It has four lone pairs of electrons

• It has PPP angle 60°