7
MCQ (Single Correct Answer)
What will be the molality of the solution containing 18.25 g of HCl gas in 500 g of water?
A
0.1 m
B
1 M
C
0.5 m
D
1 m
8
MCQ (Single Correct Answer)
One mole of any substance contains $6.022 \times 10^{23}$ atoms/molecules. Number of molecules of $\mathrm{~H}_2 \mathrm{SO}_4$ present in 100 mL of $0.02 \mathrm{~M} \mathrm{~H}_2 \mathrm{SO}_4$ solution is ............. .
A
$12.044 \times 10^{20}$ molecules
B
$6.022 \times 10^{23}$ molecules
C
$1 \times 10^{23}$ molecules
D
$12.044 \times 10^{23}$ molecules
9
MCQ (Single Correct Answer)
What is the mass per cent of carbon in carbon dioxide?
A
$0.034 \%$
B
$27.27 \%$
C
$3.4 \%$
D
$28.7 \%$
10
MCQ (Single Correct Answer)
The empirical formula and molecular mass of a compound are $\mathrm{CH}_2 \mathrm{O}$ and 180 g respectively. What will be the molecular formula of the compound?
A
$\mathrm{C}_9 \mathrm{H}_{18} \mathrm{O}_9$
B
$\mathrm{CH}_2 \mathrm{O}$
C
$\mathrm{C}_6 \mathrm{H}_{12} \mathrm{O}_6$
D
$\mathrm{C}_2 \mathrm{H}_4 \mathrm{O}_2$
11
MCQ (Single Correct Answer)
If the density of a solution is $3.12 \mathrm{~g} \mathrm{~mL}^{-1}$, the mass of 1.5 mL solution in significant figures is ............. .
A
4.7 g
B
$4680 \times 10^{-3} \mathrm{~g}$
C
4.680 g
D
46.80 g