Question # 1

Which statement about a molecule is incorrect.

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It exist independently

Molecules of a substances are similar

Hemoglobin is a homoatomic molecules

Oxygen molecule is a macromolecule

Ascorbic acid is vitamin.

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A

B

C

D

The smallest collection of ions in an ionic compound is called.

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Formula unit

Chemical formula

Formula mass

Molecular formula

How many atoms are present in half mol of oxygen gas. Gas exist in diatomic state.

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3.01 x 10²³

6.02 x 10²³

2 x 10²³

1.003 x 10²³

The volume occupied by 16 g of CH4 at S.T.P.

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224.14 dm3

22.4 dm3

1.12 dm3

2.24 dm3

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

Calcium has isotopes

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7

9

1

6

The element nickel has isotopes.

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3

2

5

7

The mass of one mole of electrons is.

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1.008 mg

0.55 mg

0.184 mg

1.673 mg

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