Question # 1

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

What is the mass of aluminium is 204 g of the aluminum oxide Al2O3.

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26 g

27 g

54 g

108 g

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

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CH₃- OH

C₂H₅OH

HCOOH

H₂O

Which statement is incorrect about Dempster's mass spectrometer.

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Solid sample can be used in this mass spectrometer

Ions are detected on the basis of mass to charge ratio

Atoms or molecules are ionized with beam of electron.

This spectrometer work at one atmospheric pressure.

Calcium has isotopes

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7

9

1

6

Bromine has isotopes

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2

4

8

6

The separation of the different isotopes in the mass spectrometer is done on the basis of

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Different amounts of positive changes

Charge e/m value different amounts of negative changes

Different m/e value

Velocities of the ions

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

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

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1:1

1:2

1:32

1:4

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

CO+ is an example of.

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Free radical

Cationic molecular ion

Anionic molecular ion

Stable molecule

The mass of two moles of electrons is

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1.10 mg

1.008 mg

0.184 mg

1.673 mg

Nickel has isotopes

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3

5

6

11

Chlorine atom and chloride ions.

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Are chemically identical

Are allotropes of chlroin

Have same number of electrons

Have same number of protons

One mole of CH₃OH and one mole of C₂H₅OH have

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Equal number of atoms

Equal number of molecules

Equal number of electrons

Equal number of protons

Many element have fractional atomic masses. This is because.

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the mass of the atom is itself fractional

Atomic masses are average mases of Isobars

Atomic masses are average masses Isotopes

Atomic masses are average masses of Isotopes proportional to their relative abundance.

One molecule of hemoglobin in heavier than one atom of hydrogen.

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680 times

6800 times

68000 times

680000 times

If the empirical formula of compound is CH2 and its molecular mass is 56 than what is the actual molecular formula of this compound.

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CH2

C2H4

C3H6

C4H8

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