21.

Certain electric current for half an hour can collect 11.2 L of hydrogen at NTP. Same current when passed through an electrolytic solution for one hour, can deposite how much silver?

• 216g

• 108 g

• 47 g

• 60 g

Which of the following complexes is an outer orbital complex?

• [Co(NH₃)₆]³⁺

• [Fe(CN)₆]^4-

• [Ni(NH₃)₆]²⁺

• [Mn(CN)₆]^4-

IUPAC name for the complex compound K₃[Fe(CN₆)] is

• Potassium hexacyanoferrate [II]

• Potassium cynohexaferrate [II]

• Potassium hexaoyanoferrate [Ill]

• Potassium ferrocyanide iron [III]

The rate of a reaction doubles when the initial concentration of the reactant is made four fold. If the initial concentration is made 400 fold, then the rate will become

• 400 times

• 200 times

• 40 times

• 20 times

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

Correct order of paramagnetism is

• Mn>Cr> Zn

• Fe> Zn> Cr

• Cr> Fe> Zn

• Zn >Mn> Fe

The rate constant of a reaction is given by $\frac{{\mathrm{N}}_{\mathrm{t}}}{{\mathrm{N}}_{\circ }}= {\mathrm{e}}^{-\mathrm{Kt}}$ . This represents for reaction of

• zero order

• second order

• first order

• None of these

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)

In acidic medium, the equivalent weight of  K₂Cr₂O₇ (Mol. wt. = M) is

• M

• M/2

• M/3

• M/6