Some Basic Concepts of Chemistry Set-3

Practice Important MCQs for Some Basic Concepts of Chemistry — Chemistry, Class 11.

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Q1. The total number of electrons present in one molecule of methane is;

(A)

(B)

(C)

(D)

Q2. Calculate the number of moles for each case respectively;
I. $22g$ $\text{CO}_2$
II. $N_A/4$ Molecule of $\text{CO}_2$
III. $22.4$ $\text{L}$ $\text{CO}_2$ at STP

(A)

0.25, 0.25, 0.25

(B)

0.25, 0.05, 0.05

(C)

0.05, 0.25, 0.25

(D)

0.5, 0.25, 1

Q3. How many moles of carbon present in $88$ $g$ of $\text{CO}_2$ [Atomic mass of $C = 12$ $amu$ and $O = 16$ $amu$ ]

(A)

(B)

(C)

(D)

Q4. The number of molecules in $4.25gm$ ammonia is

(A)

$1.0 \times 10^{23}$

(B)

$1.5 \times 10^{23}$

(C)

$2.0 \times 10^{23}$

(D)

$2.5 \times 10^{23}$

Q5. How many atoms are present in $28\text{ grams of } \text{N}_2$ ?

(A)

$1\text{ N}_A$

(B)

$2\text{ N}_A$

(C)

$3\text{ N}_A$

(D)

$4\text{ N}_A$

Q6. How many atoms are present in $0.046$ $g$ of ethanol?

(A)

$6 \times 10^{20}$

(B)

$1.2 \times 10^{21}$

(C)

$3 \times 10^{21}$

(D)

$3.6 \times 10^{21}$

Q7. Number of g-atom of S present in $49$ $g$ $H_2SO_4$ are:

(A)

0.5

(B)

(C)

0.2

(D)

0.3

Q8. Which of the following pair of gases contain the same number of molecules?

(A)

$16$ $g$ $\text{O}_2$ , $14$ $g$ $\text{N}_2$

(B)

$8$ $g$ $\text{O}_2$ , $22$ $g$ $\text{N}_2$

(C)

$28$ $g$ $\text{N}_2$ , $22$ $g$ $\text{CO}_2$

(D)

$32$ $g$ $\text{O}_2$ , $32$ $g$ $\text{N}_2$

Q9. The mass of a molecule of water is

(A)

$3 \times 10^{-25}$ $kg$

(B)

$3 \times 10^{-26}$ $kg$

(C)

$1.5 \times 10^{-26}$ $kg$

(D)

$2.5 \times 10^{-26}$ $kg$

Q10. How many moles of hydrogen atoms present in $34$ $g$ of $NH_3$ ?

(A)

(B)

(C)

(D)

Q11. Calculate mole fraction of ethyl alcohol and water in a solution containing $46 g$ ethyl alcohol and $36 g$ water.

(A)

$\chi_{C_2H_5OH} = \frac{1}{3}$ , $\chi_{H_2O} = \frac{2}{3}$

(B)

$\chi_{C_2H_5OH} = \frac{1}{2}$ , $\chi_{H_2O} = \frac{1}{2}$

(C)

$\chi_{C_2H_5OH} = \frac{1}{4}$ , $\chi_{H_2O} = \frac{3}{4}$

(D)

$\chi_{C_2H_5OH} = \frac{3}{4}$ , $\chi_{H_2O} = \frac{1}{4}$

Q12. A solution of $FeCl_3$ is $\frac{M}{30}$ its molarity for $Cl^-$ ion will be

(A)

$\frac{M}{90}$

(B)

$\frac{M}{30}$

(C)

$\frac{M}{10}$

(D)

$\frac{M}{5}$

Q13. Which of the following has no units?

(A)

Molarity

(B)

Normality

(C)

Molality

(D)

Mole fraction

Q14. Which of the following concentration term does not depend on temperature?

(A)

Molarity

(B)

Mass/volume

(C)

Molality

(D)

Normality

Q15. The molarity of the solution containing 2.8% mass by volume solution of KOH (Given: atomic mass of $K = 39$ ) is:

(A)

$0.1 M$

(B)

$0.5 M$

(C)

$0.2 M$

(D)

$1 M$

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