11
MCQ (Single Correct Answer)
Which of the following will produce a buffer solution when mixed i equal volumes?
A
$0.1 \mathrm{~mol} \mathrm{~dm}^{-3} \mathrm{NH}_4 \mathrm{OH}$ and $0.1 \mathrm{~mol} \mathrm{~dm}^{-3} \mathrm{HCl}$
B
$0.05 \mathrm{~mol} \mathrm{~dm}^{-3} \mathrm{NH}_4 \mathrm{OH}$ and $0.1 \mathrm{~mol} \mathrm{~dm}^{-3} \mathrm{HCl}$
C
$0.1 \mathrm{~mol} \mathrm{~dm}^{-3} \mathrm{NH}_4 \mathrm{OH}$ and $0.05 \mathrm{~mol} \mathrm{~dm}^{-3} \mathrm{HCl}$
D
$0.1 \mathrm{~mol} \mathrm{~dm}^{-3} \mathrm{CH}_4 \mathrm{COONa}$ and $0.1 \mathrm{~mol} \mathrm{~dm}^{-3} \mathrm{NaOH}$
12
MCQ (Single Correct Answer)
In which of the following solvents is silver chloride most soluble?
A
$0.1 \mathrm{~mol} \mathrm{~dm}^{-3} \mathrm{AgNO}_3$ solution
B
$0.1 \mathrm{~mol} \mathrm{~dm}^{-3} \mathrm{HCl}$ solution
C
$\mathrm{H}_2 \mathrm{O}$
D
Aqueous ammonia
13
MCQ (Single Correct Answer)
What will be the value of pH of $0.01 \mathrm{~mol} \mathrm{dm}^{-3} \mathrm{CH}_3 \mathrm{COOH}$ $\left(K_a=1.74 \times 10^{-5}\right) ?$
A
3.4
B
3.6
C
3.9
D
3.0
14
MCQ (Single Correct Answer)
$\mathrm{K}_{\mathrm{a}}$ for $\mathrm{CH}_3 \mathrm{COOH}$ is $1.8 \times 10^{-5}$ and $\mathrm{K}_{\mathrm{b}}$ for $\mathrm{NH}_4 \mathrm{OH}$ is $1.8 \times 10^{-5}$. The pH of ammonium acetate will be
A
7.005
B
4.75
C
7.0
D
Between 6 and 7
15
MCQ (Single Correct Answer)
Which of the following options will be correct for the stage of half completion of the reaction $\mathrm{A} \rightleftharpoons \mathrm{B}$ ?
A
$\Delta G^{\ominus}=0$
B
$\Delta G^{\ominus}>0$
C
$\Delta \mathrm{G}^{\ominus}<0$
D
$\Delta G^{\ominus}=-R T \ln K$