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

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

405.

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°

Match List I (species) with List II (hybridization) and select the correct code given below

• A    B    C    D

  (iii) (ii)  (iv) (i)

• A    B    C    D

  (i)  (iv) (ii)  (iii)

• A    B    C    D

  (iii) (iv) (ii)  (i)

• A    B    C    D

  (i)  (ii)  (iv) (iii)

Which of the following statment is true?

• SnCl₄ is more stable than SnCl₂

• PbCl₂ is more stable than PbCl₄

• GeCl_4, is more stable than GeCl₂

• TICl₃ is more stable than TICl

Microcosmic salt when heated strongly, a transparent bead is formed which is used in the identification of

• ZnO

• Al₂O₃

• MgO

• SiO₂