Some Basic Concepts of Chemistry Set-1

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

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Q1. What will be the molarity of a solution, which contains $5.85\text{g of } \text{NaCl}(\text{s}) \text{ per } 500\text{mL}$ ?

(A)

$4\text{ mol L}^{-1}$

(B)

$20\text{ mol L}^{-1}$

(C)

$0.2\text{ mol L}^{-1}$

(D)

$2\text{ mol L}^{-1}$

Q2. Zinc sulphate contains $22.65\%$ zinc and $43.9\%$ water of crystallisation. If the law of constant proportions is true, then the weight of zinc required to produce $20\text{g}$ of the zinc sulphate crystals will be:

(A)

$45.3\text{g}$ .

(B)

$4.53\text{g}$ .

(C)

$0.453\text{g}$ .

(D)

$453\text{g}$ .

Q3. What will be the molality of the solution made by dissolving $10\text{g of } \text{NaOH} \text{ in } 100\text{g of water}$ ?

(A)

$2.5\text{m}$ .

(B)

$5\text{m}$ .

(C)

$10\text{m}$ .

(D)

$1.25\text{m}$ .

Q4. Which of the following statements is/ are incorrect?

(A)

The weight of a substance can be determined very accurately by using an analytical balance.

(B)

Volume is denoted in $\text{dm}$ units.

(C)

Density of a substance is its amount present per unit volume.

(D)

Candela is the luminous intensity, that emits monochromatic radiation of frequency, $540 \times 10^{12}\text{ Hz}$ .

Q5. One mole of oxygen gas at $\text{STP}$ is equal to:

(A)

$6.022 \times 10^{23}$ molecules of oxygen.

(B)

$6.022 \times 10^{23}$ atoms of oxygen.

(C)

$16\text{g}$ of oxygen.

(D)

$32\text{g}$ of oxygen.

Q6. The result reported in the following multiplication of significant figures, $2.5 \times 1.25 = 3.125$ should be:

(A)

$3.125$

(B)

$3.1$

(C)

$3.12$

(D)

$3.10$

Q7. How many number of aluminium ions are present in $0.051\text{g of aluminium oxide } (\text{Al}_2\text{O}_3)$ ?

(A)

$6.023 \times 10^{23} \text{ ions}$ .

(B)

$3 \text{ ions}$ .

(C)

$6.023 \times 10^{20} \text{ ions}$ .

(D)

$9 \text{ ions}$ .

Q8. The solution of A and B are $0.1$ and $0.2$ molar in a substance. If $100\text{mL of ‘A’}$ are mixed with $25\text{mL of B}$ and there is no change in volume, then the final molarity of solution is:

(A)

$0.15\text{M}$

(B)

$0.18\text{M}$

(C)

$0.12\text{M}$

(D)

$0.30\text{M}$

Q9. One of the statements of Dalton’s atomic theory is given below: “Compounds are formed when atoms of different elements combine in a fixed ratio.” Which of the following laws is not related to this statement?

(A)

Law of conservation of mass.

(B)

Law of definite proportions.

(C)

Law of multiple proportions.

(D)

Avogadro law.

Q10. The weight of iron which will be converted into its oxide $(\text{Fe}_3\text{O}_4)$ by the action of $18\text{g of steam}$ on it will be (Atomic weight of $\text{Fe} = 56$ ):

(A)

$168\text{g}$ .

(B)

$84\text{g}$ .

(C)

$42\text{g}$ .

(D)

$21\text{g}$ .

Q11. How many number of molecules and atoms respectively are present in $2.8\text{L of a diatomic gas at STP}$ ?

(A)

$6.023 \times 10^{23} , 7.5 \times 10^{23}$

(B)

$6.023 \times 10^{23} , 15 \times 10^{22}$

(C)

$7.5 \times 10^{22} , 15 \times 10^{22}$

(D)

$15 \times 10^{22} , 7.5 \times 10^{23}$

Q12. A gas is found to have the formula $(\text{CO})_x$ . Its vapour density is $70$ . The value of $x$ will be:

(A)

$7$

(B)

$4$

(C)

$5$

(D)

$6$

Q13. The mass of one mole of a chloride formed by metal ‘ $\text{X}$ ’ is $111.0\text{g}$ . Which one could be the formula of the chloride?

(A)

$\text{XCl}$

(B)

$\text{XCl}_2$

(C)

$\text{XCl}_3$

(D)

$\text{XCl}_4$

Q14. Which law states that if two elements can combine to form more than one compound, the masses of one element that combine with a fixed mass of other element, are in the ratio of small whole numbers?

(A)

Avogadro’s law.

(B)

Law of definite composition.

(C)

Law of multiple proportions.

(D)

Gay Lussac’s law of gaseous volumes.

Q15. Which set of figures will be obtained after rounding up to three significant figures $1.386, 4.334, 2.808$ ?

(A)

$1.39, 4.34, 2.809$

(B)

$1.39, 4.33, 2.81$

(C)

$1.38, 4.34, 2.800$

(D)

$1.39, 4.34, 2.80$

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