Which metal is used for extraction of Au and Ag and also for galvanisation of iron objects?

(a)

Mg

(b)

Zn

(c)

Cr

(d)

Co

Lewis acid character of boron trihalides is as a follows _______.

(a)

BF₃ > BCl₃ > BBr₃ > BI₃

(b)

BCI₃ > BF₃ > BBr₃ > BI₃

(c)

BI₃ > BBr₃ > BCl₃ > BF₃

(d)

BI₃ > BF₃ > BCl₃ > BBr₃

Which of the following is correct?

(a)

H₃PO₃ is dibasic and reducing

(b)

H₃PO₃ is dibasic and non-reducing

(c)

H₃PO₄ is tribasic and reducing

(d)

H₃PO₃ is tribasic and non-reducing

The catalytic activity of transition metals is due to ________.

(a)

the formation of a variety of oxidation states

(b)

the formation of intermediate products

(c)

the capability of forming interstitial compounds.

(d)

all the above

Which of the following defects decreases the density of the crystal?

(a)

Interstitial defect

(b)

Vacancy defect

(c)

Frankel defect

(d)

None of these above

2N₂O₅ ⟶ NO₂ + O₂, \(\frac { d\left[ { N }_{ 2 }{ O }_{ 5 } \right] }{ dt } \) = k₁[N₂O₅], \(\frac { d\left[ { NO }_{ 2 } \right] }{ dt } \)= k₂[N₂O₅] and \(\frac { d{ O }_{ 2 } }{ dt } \) = k ₃[N₂O₅], the relation between k₁, k₂ and k₃ is _____.

(a)

2k₁ = 4k₂ = k₃

(b)

k₁ = k₂ = k₃

(c)

2k₁ = k₂ = 4k₃

(d)

2k₁ = k₂ = k₃

Which one among the following in the strongest Bronsted base.

(a)

\({ ClO }_{ 4 }^{ - }\)

(b)

\({ ClO }_{ 3 }^{ - }\)

(c)

\({ ClO }_{ 2 }^{ - }\)

(d)

\({ ClO }^{ - }\)

Which one of the following solution has highest equivalent conductance?

(a)

0.1 M NaCI

(b)

0.05 M NaCI

(c)

0.005 M NaCI

(d)

0.25 M NaCI

Which among the following true regarding adsorption?
(i) Adsorption is a spontaneous process
(ii) Adsorption is always accompanied by increase in free energy.
(iii) Adsorption is an endothermic process
(iv) Adsorption can occur in all interfacial surfaces.

(a)

only (ii)

(b)

(ii) and (iii)

(c)

only (i)

(d)

(i) and (iv)

Which among the following alkene on acid hydration will produce tertiary butyl alcohol?

(a)

\({ CH }_{ 3 }-\underset { \overset { | }{ { CH }_{ 3 } } }{ C } ={ CH }_{ 2 }\)

(b)

CH₃-CH=CH₂

(c)

\({ CH }_{ 3 }-\underset { \overset { || }{ { CH }_{ 2 } } }{ CH } \)

(d)

CH₃-CH₂-CH=CH-CH₃