Some Basic Concepts of Chemistry Test

Result

Some Basic Concepts of Chemistry Test - 18

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Weekly Quiz Competition

Question 1
4 / -1

Number of atoms of He in 100 u of He (atomic weight of He is 4) are

A
25

B
100

C
50

D
100 x 6 x 10^-23

Solution
Question 2
4 / -1

The number of gram molecules of chlorine in 6.02 x 10²⁵ hydrogen chloride molecules is

A
10

B
100

C
50

D
5

Solution
Question 3
4 / -1

Which one of the following has maximum number of atoms of oxygen

A
2 g of carbon monoxide

B
2 g of carbon dioxide

C
2 g of sulphur dioxide

D
2 g of water

Solution
Question 4
4 / -1

Gram molecular volume of oxygen at STP is

A
3200 cm³

B
5600 cm³

C
22400 cm³

D
11200 cm³

Solution
Question 5
4 / -1

Which has maximum number of atoms?

A
24 g of C

B
56 g of Fe

C
26 g of Al

D
108 g of Ag

Solution
Question 6
4 / -1

Which of the following has the smallest number of molecules ?

A
0.1 mole of CO₂ gas

B
11.2 L of CO₂ gas at STP

C
22 g of CO₂ gas

D
22.4 X 10³ mL of CO₂ gas at STP

Solution
Question 7
4 / -1

4.6 x 10²² atoms of an element weigh 13.8 g. The atomic weight of that element is

A
290

B
180

C
34.4

D
10.4

Solution
Question 8
4 / -1

Law of constant composition is same as the law of

A
conservation of mass

B
conservation of energy

C
multiple proportion

D
definite proportion

Solution
Question 9
4 / -1

The maximum number of molecules are present in

A
15 L of H₂ gas at STP

B
5 L of N₂ gas at STP

C
0.5 g of H₂ gas

D
10 g of O₂ gas

Solution
Question 10
4 / -1

Assertion (A) Equal moles of different substances contain same number of constituent particles.
Reason (R) Equal weights of different substances contain the same number of constituent particles.
The correct answer is

A
Both A and R are correct and R is the correct explanation of A

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

C
A is correct, but R is incorrect

D
A is incorrect, but R is correct