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Chemistry Fsc Part 1 Chapter 1 Online Test MCQs With Answers

Question # 1

Which of the following compound has the highest % o f oxygen by weight

Choose an answer

CH₃- OH

C₂H₅OH

HCOOH

H₂O

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Question # 2

The number of moles of hydrogen atoms in 3.2 g of methane CH4.

Choose an answer

0.2

0.4

0.6

0.8

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Question # 3

12.04 x 10²³atoms of nitrogen gas is equal to.

Choose an answer

1 mol

2 mol

3 mol

4 mol

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Question # 4

One mole of Carbon -12 has mass

Choose an answer

0.012 kg

1 kg

0.022 kg

12 kg

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Question # 5

the number of Al³⁺ ion sin AlCl₃is 2.007 x 10²³. The number of Cl- ions are.

Choose an answer

6.02 x 10²³

3.01 x 10²³

1.5 x 10²³

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Question # 6

The ration of number of molecules of 2 g H2 g to number of molecules of 64 g gaseous oxygen is.

Choose an answer

1:1

1:2

1:32

1:4

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Question # 7

27g of Al will react completely with how much mass of O2, to produce Al2O3.

Choose an answer

8 g of oxygen

16 g of oxygen

32 g of oxygen

24 g of oxygen

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Question # 8

The Avogadro constant is the number of.

Choose an answer

Atoms in 1 g of helium ga

Molecules in 35.5 g of chlorine gas

Atoms in 6 h graphite

Atoms in 24 g of magnesium

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Question # 9

A glass is full of water and contains 6.02 x 10²³molecules of H2O The mass of water molecules is.

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18 gm

90 g

120 g

180 g

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