# One mole of oxygen gas at STP is equal to: (a) 6 .022× 1023 molecules of oxygen (b) 6.022 × 1023 atoms of oxygen (c) 16 g of oxygen molecule (d) 32 g of oxygen 1. (a) and (b) 2. (a) and (c) 3. (a) and (d) 4. (c) and (d)

Subtopic:  Moles, Atoms & Electrons |
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Sulphuric acid reacts with sodium hydroxide as follows

${\mathrm{H}}_{2}{\mathrm{SO}}_{4}+2\mathrm{NaOH}\to {\mathrm{Na}}_{2}{\mathrm{SO}}_{4}+2{\mathrm{H}}_{2}\mathrm{O}$

When 1L of 0.1 M sulphuric acid solution is allowed to react with 1 L of 0.1 M sodium hydroxide solution, the amount of sodium sulphate formed and its molarity in the solution obtained are respectively-

1. 0.1 M, 7.10 g

2. 7.10 g, 0.025 M

3. 0.025 M, 3.55 g

4. 3.55 g, 0.25 M

Subtopic:  Concentration Based Problem |
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Which of the following pairs have the same number of atoms?

 (a) 16 g of O2(g) and 4 g of H2(g) (b) 16 g of O2 and 44 g of CO2 (c) 28 g of N2 and 32 g of O2 (d) 12 g of C(s) and 23 g of Na(s)

1. (a), (b)

2. (b), (c)

3. (c), (d)

4. (b), (d)

Subtopic:  Moles, Atoms & Electrons |
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Which of the following solutions have the same concentration?

 1 20 g of NaOH in 200 mL of solution 2 0.5 mol of KCl in 200 mL of solution 3 40 g of NaOH in 100 mL of solution 4 20 g of KOH in 200 mL of solution

1. (a), (b)

2. (b), (c)

3. (c), (d)

4. (b), (d)

Subtopic:  Concentration Based Problem |
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16 g of oxygen has the same number of molecules as in:

(a) 16 g of CO

(b) 28 g of N2

(c) 14 g of N2

(d) 1.0 g of H2

1. (a), (b)

2. (b), (c)

3. (c), (d)

4. (b), (d)

Subtopic:  Moles, Atoms & Electrons |
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Unitless term among the following is/are-

(a) Molality

(b) Molarity

(c) Mole fraction

(d) Mass percent

1. (a), (b)

2. (b), (c)

3. (c), (d)

4. (b), (d)

Subtopic:  Concentration Based Problem |
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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

1. (a), (d)

2. (b), (c)

3. (c), (d)

4. (b), (d)

Subtopic:  Introduction |
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(a) 16 g of gas

(b) 22.7 L of gas

(c) $6.022×{10}^{23}$ dioxygen molecules

(d) 11.2 L of gas

The incorrect statements regarding 1 mole of dioxygen gas at STP from the above four statements are:

1. (a, b, c)
2. (a, b, d)
3. (b, c, d)
4. (a, c, d)

Subtopic:  Moles, Atoms & Electrons |
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 Assertion (A): The combustion of 16 g of methane gives 18 g of water. Reason (R): In the combustion of methane, water is one of the products.

 1 Both (A) and (R) are True and (R) is the correct explanation of (A). 2 Both (A) and (R) are True but (R) is not the correct explanation of (A). 3 (A) is True but (R) is False. 4 (A) is False but (R) is True.
Subtopic:  Moles, Atoms & Electrons |
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 Assertion (A): The significant figure for 0.200 is 3, whereas the significant figure for 200 is 1. Reason (R): Zero at the end or right of a number is significant, provided it is not on the right side of the decimal point.

 1 Both (A) and (R) are true and (R) is the correct explanation of (A). 2 Both (A) and (R) are true but (R) is not the correct explanation of (A). 3 (A) is true but (R) is false. 4 (A) is false but (R) is true.

Subtopic:  Introduction |
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