Chemistry Test-3

Question 1
4 / -1

Adsorption of gases on solid surface is exothermic because:

A
Enthalpy is positive

B
Entropy decreases

C
Entropy increases

D
Free energy increases

Question 2
4 / -1

Which of the following metal evolves hydrogen on reacting with cold dilute \(\mathrm{HNO}_3\)?

A
\(\mathrm{Mg}\)

B
\(\mathrm{Al}\)

C
\(\mathrm{Fe}\)

D
\(\mathrm{Cu}\)

Question 3
4 / -1

Benzene is a polymer of:

A
Methane

B
Acetylene

C
Ethane

D
Ethyne

Question 4
4 / -1

The equilibrium constants at \(1140 K\) for these two reactions are

\(2 C O(g)\rightleftharpoons C(s)+C O_{2}(g) ; K_{p_{1}}=10^{-12} a t m^{-1} \)

\(C O(g)+C l_{2}(g) \rightleftharpoons COCl_{2}(g) ; K_{p_{2}}=3 \times 10^{-3} atm ^{-1}\)

What will be equilibrium constant \(K_{c}\) for the following reaction at \(1140 K\) ?

\(C(s)+C_{2}(g)+2 C l_{2}(g) \rightleftharpoons 2COCl_{2}(g)\)

A
\(8.42 \times 10^{8} M^{-1}\)

B
\(8.42 \times 10^{4} M^{-1}\)

C
\(4.21 \times 10^{4} M^{-1}\)

D
\(4.21 \times 10^{8} M^{-1}\)

Question 5
4 / -1

The primary valence of the metal ion in the co-ordination compound \(K _{2}\left[ N i ( C N )_{4}\right]\) is:

A
Four

B
Zero

C
Two

D
Six

Question 6
4 / -1

Which of the following is nota greenhouse gas?

A
\(\text{CO}_2\)

B
\(\text{CH}_4\)

C
\(\text{O}_3\)

D
\(\text{N}_2\)

Question 7
4 / -1

In Rutherford's alpha-particle scattering experiment, the particles are directed towards a thin ___________ foil.

A
lead

B
gold

C
aluminium

D
silver

Question 8
4 / -1

A compound contains \(4.07 \%\) hydrogen, \(24.27 \%\) carbon and \(71.65 \%\) chlorine. Its molar mass is \(98.96 \mathrm{~g} .\) What are its empirical and molecular formulas?

A
\(\mathrm{CH}_{2} \mathrm{Cl}\)

B
\(\mathrm{CH} \mathrm{Cl}_{2}\)

C
\(\mathrm{CH} \mathrm{Cl}\)

D
\(\mathrm{C}_2 H \mathrm{Cl}_{2}\)

Question 9
4 / -1

The enthalpy and entropy change for the reaction:

\(\mathrm{Br}_{2}(l)+\mathrm{Cl}_{2}(\mathrm{~g}) \rightarrow 2 \mathrm{BrCl}(\mathrm{g})\) are \(30 \mathrm{kJ} \mathrm{mol}^{-1}\) and \(105 \mathrm{JK}^{-1} \mathrm{mol}^{-1}\) respectively.

The temperature at which the reaction will be in equilibrium is:

A
\(273 \mathrm K\)

B
\(450 \mathrm K\)

C
\(300 \mathrm K\)

D
\(285.7 \mathrm K\)

Question 10
4 / -1

Which one of the following species does not exist under normal conditions?

A
\(\mathrm{Be}_{2}^{+}\)

B
\(\mathrm{Be}_{2}\)

C
\(\mathrm{B}_{2}\)

D
\(\mathrm{Li}_{2}\)

Submit Test

Chemistry Test-...

Question 1

Enthalpy is positive

Entropy decreases

Entropy increases

Free energy increases

Question 2

\(\mathrm{Mg}\)

\(\mathrm{Al}\)

\(\mathrm{Fe}\)

\(\mathrm{Cu}\)

Question 3

Methane

Acetylene

Ethane

Ethyne

Question 4

\(8.42 \times 10^{8} M^{-1}\)

\(8.42 \times 10^{4} M^{-1}\)

\(4.21 \times 10^{4} M^{-1}\)

\(4.21 \times 10^{8} M^{-1}\)

Question 5

Four

Zero

Two

Six

Question 6

\(\text{CO}_2\)

\(\text{CH}_4\)

\(\text{O}_3\)

\(\text{N}_2\)

Question 7

lead

gold

aluminium

silver

Question 8

\(\mathrm{CH}_{2} \mathrm{Cl}\)

\(\mathrm{CH} \mathrm{Cl}_{2}\)

\(\mathrm{CH} \mathrm{Cl}\)

\(\mathrm{C}_2 H \mathrm{Cl}_{2}\)

Question 9

\(273 \mathrm K\)

\(450 \mathrm K\)

\(300 \mathrm K\)

\(285.7 \mathrm K\)

Question 10

\(\mathrm{Be}_{2}^{+}\)

\(\mathrm{Be}_{2}\)

\(\mathrm{B}_{2}\)

\(\mathrm{Li}_{2}\)

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