Chemistry XII - Some Basic Concepts in Chemistry 04

Question : 1

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The mass of CO₂ which contains the same number of molecules as are contained in 40 g of oxygen are

Options:

	50 g
	55 g
	60 g
	65 g

Solution :

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Question : 2

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The mass of a molecule of CO₂ is

Options:

	7.3 × 10–23 g
	8.2 × 10–23 g
	7.3 × 10–24 g
	7.0 × 10–24 g

Solution :

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Question : 3

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The number of molecules of sulphur present in 64.0 g of sulphur (S8) are

Options:

	1.2 × 1024
	1.5 × 1025
	1.5 × 1023
	1.9 × 1023

Solution :

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Question : 4

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The volume at STP occupied by 14 g of nitrogen is

Options:

	11.2 L
	22.4 L
	44.8 L
	36.2 L

Solution :

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Question : 5

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The mass of 0.1 mole of KNO₃ is

Options:

	10.1 g
	9.8 g
	4.2 g
	5.6 g

Solution :

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Question : 6

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The volume occupied by 1021 molecules of oxygen is

Options:

	45.0 mL at STP
	37.2 mL at STP
	50.2 mL at STP
	60.0 mL at STP

Solution :

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Question : 7

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The mass of carbon present in 0.5 mole of K₄[Fe(CN)₆] is

Options:

	40 g
	30 g
	45 g
	36 g

Solution :

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Question : 8

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Options:

Solution :

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Question : 9

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The mass of 350 cm³ of a diatomic gas at 273 K at 2 atm pressure is one gram. Then the mass of one atom of the gas is

Options:

	2.0 × 10–24 g
	2.6 × 10–23 g
	3.9 × 10–23 g
	4.2 × 10–23 g

Solution :

 

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Question : 10

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Which of the following is smallest number of molecules?

Options:

	11.2 L of O2 at STP
	8.0 g of O2
	0.1 mole of O2
	2.24 × 104 mL of O2

Solution :