Some Basic Concepts of Chemistry Set-3

Test your knowledge on Some Basic Concepts of Chemistry from Chemistry, Class 11.

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Questions in this Quiz

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

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

0.25, 0.25, 0.25
0.25, 0.05, 0.05
0.05, 0.25, 0.25
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 $O = 16$ $amu$]

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

$1.0 \times 10^{23}$
$1.5 \times 10^{23}$
$2.0 \times 10^{23}$
$2.5 \times 10^{23}$

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

$1\text{ N}_A$
$2\text{ N}_A$
$3\text{ N}_A$
$4\text{ N}_A$

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

$6 \times 10^{20}$
$1.2 \times 10^{21}$
$3 \times 10^{21}$
$3.6 \times 10^{21}$

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

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

$16$ $g$ $\text{O}_2$, $14$ $g$ $\text{N}_2$
$8$ $g$ $\text{O}_2$, $22$ $g$ $\text{N}_2$
$28$ $g$ $\text{N}_2$, $22$ $g$ $\text{CO}_2$
$32$ $g$ $\text{O}_2$, $32$ $g$ $\text{N}_2$

Q9: The mass of a molecule of water is

$3 \times 10^{-25}$ $kg$
$3 \times 10^{-26}$ $kg$
$1.5 \times 10^{-26}$ $kg$
$2.5 \times 10^{-26}$ $kg$

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

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

$\chi_{C_2H_5OH} = \frac{1}{3}$, $\chi_{H_2O} = \frac{2}{3}$
$\chi_{C_2H_5OH} = \frac{1}{2}$, $\chi_{H_2O} = \frac{1}{2}$
$\chi_{C_2H_5OH} = \frac{1}{4}$, $\chi_{H_2O} = \frac{3}{4}$
$\chi_{C_2H_5OH} = \frac{3}{4}$, $\chi_{H_2O} = \frac{1}{4}$

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

$\frac{M}{90}$
$\frac{M}{30}$
$\frac{M}{10}$
$\frac{M}{5}$

Q13: Which of the following has no units?

Molarity
Normality
Molality
Mole fraction

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

Molarity
Mass/volume
Molality
Normality

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

$0.1 M$
$0.5 M$
$0.2 M$
$1 M$

Q16: The number of moles of solute present in $2.0$ litres of $0.5M NaOH$ solution is:

$2$
$1$
$4$
$0.1$

Q17: Mass of $NaCl$ required to prepare $0.01 m$ aqueous solution in $1 kg$ water is

$0.01 g$
$0.585 g$
$58.8 g$
$5.88 g$

Q18: $9.8 g$ of $H_2SO_4$ is present in $2$ litres of a solution. The molarity of the solution is:

$0.1 M$
$0.05 M$
$0.2 M$
$0.01 M$

Q19: In one molal solution that contains $0.5$ mole of a solute, there is:

$1000 g$ of solvent
$400 mL$ of solvent
$500 g$ of solvent
$100 mL$ of solvent

Q20: Number of moles of solute dissolved in $1000g$ of the solvent is called:

Molarity
Molality
Formality
Normality

Q21: $N_2(g) + 3H_2(g) \rightleftharpoons 2NH_3(g)$
$20 g$ $5 g$
Consider the above reaction, the limiting reagent of the reaction and number of moles of $NH_3$ formed respectively are:

$H_2$, $1.42$ moles
$H_2$, $0.71$ moles
$N_2$, $1.42$ moles
$N_2$, $0.71$ moles

Q22: $3$ mol of $N_2$ and $2$ mol of $H_2$ were heated in a closed vessel. Maximum amount of $NH_3$ produced by their reaction is:

$18.52 g$
$22.66 g$
$20.57 g$
$24.31 g$

Q23: Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R):
Assertion (A): The mass of the products formed in a reaction depends upon the limiting reactant.
Reason (R): Limiting reactant reacts completely in the reaction.
In the light of the above statements, choose the correct answer from the options given below:

A is true but R is false
A is false but R is true
Both A and R are true and R is the correct explanation of A
Both A and R are true but R is not the correct explanation of A

Q24: $\frac{A}{2 \text{mole}} + \frac{5B}{10 \text{moles}} + \frac{8C}{4 \text{mole}} \rightarrow 6D + 7F$, in this reaction which is a limiting reagent?

A
B
C
None of these

Q25: $2$ mole of $X$ (At. Wt. $= 36$) and $3$ mole of $Y$ (At. wt. $= 24$) are reacted to form the compound $X_3Y_2$. Then:

X is the limiting reagent
Y is the limiting reagent
No reactant is left over
$1$ mole $Y$ is left over

Q26: $2 g$ of reactant A, $6 g$ of reactant C and $8 g$ of reactant D reacts to form product B. Find the limiting reagent. (Given; Molar mass (in gm/mol) of A $= 28$, B $= 34$, C $= 66$, D $= 16$)
Reaction: $2A + 4C + 3D = 8B$

D
C
A
Cannot be determined

Q27: The number of atoms present in one mole of an element is equal to Avogadro number. Which of the following contains the greatest number of atoms?

$4\text{g He}$
$46\text{g Na}$
$0.40\text{g Ca}$
$12\text{g He}$

Q28: How many atoms are present in $16\text{ grams of } \text{O}_2$?

$0.5\text{ N}_A$
$1\text{ N}_A$
$2\text{ N}_A$
$4\text{ N}_A$

Q29: How many atoms are present in $4\text{ grams of } \text{H}_2$?

$1\text{ N}_A$
$2\text{ N}_A$
$3\text{ N}_A$
$4\text{ N}_A$

Q30: How many atoms are present in $44\text{ grams of } \text{CO}_2$?

$1\text{ N}_A$
$2\text{ N}_A$
$3\text{ N}_A$
$4\text{ N}_A$