Question # 1

Which is not a molecular ion.

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He+

CH3+

NH3-

CO+

I molar volume of a gas at S.T.P is occupied by

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1 g of gas

6 x 10²³g of gas

22.4 m³of gas

1 gram molecular mass of gas

The volume occupied by 1.4 g of N2 at S.T.P is

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2.24 dm3

22.4 dm3

1.12 dm3

112 cm3

The mass of one mole of electrons is

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1.008 mg

0.55 mg

0.184 mg

1.673 mg

Nickel has isotopes

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3

5

6

11

The number of moles of CO₂which contain 8.0 g of oxygen

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0.25

0.50

1.0

1.50

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

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Formula unit

Chemical formula

Formula mass

Molecular formula

The number of electrons in one mole of hydrogen gas is.

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6.02 x 10²³

12.04 x 10²³

Only two

Indefinite

How many moles of water results by burning 4 mole of H2 with excess of oxygen.

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1 mol

2 mol

3 mol

4 mol

The volume occupied by 1.6 g of O₂at STP is

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22.4 dm³

2.24 dm³

1.12 dm³

112 dm³

Cadmium has isotopes.

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3

4

5

9

The mass of one mole of electrons is.

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1.008 mg

0.55 mg

0.184 mg

1.673 mg

What has a mass equal to that of one mole of water.

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22.4 dm3 of water

One mole of steam

One molecule of water

Two moles of hydrogen molecules and one mole of oxygen molecules.

Tin has Isotopes

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7

9

11

5

In mass spectrometry, ions are separated on the basis of.

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Masses only

Charge only

Change to mass ratio

Mass to charge ratio

Which one of the following substances is used as water absorber in combustion analysis.

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Mg(CIO4)2

50% KOH

Lime water

Dilute solution of NaOH

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

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6.02 x 10²³

3.01 x 10²³

1.5 x 10²³

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