Question # 1

The Avogadro constant is the number of.

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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

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

12.04 x 10²³atoms of nitrogen gas is equal to.

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1 mol

2 mol

3 mol

4 mol

The Number of moles of CO2 which contain 8.0 of oxygen.

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0.25

0.15

0.35

1.45

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

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 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

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

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

CO+ is an example of.

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Free radical

Cationic molecular ion

Anionic molecular ion

Stable molecule

Haemoglobin is a Macro molecule and consists of approximately atoms.

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5000

10,000

68000

15000

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.

The largest number of molecule are present.

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3.6 g of H2O

4.6 g of C2H5OH

2.8 g of CO

5.4 g of N2O5

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

Which statement is incorrect about 64 g of SO2.

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It is one mole SO2

The number of SO2 molecule are 6.02 x 10²³

The number of oxygen atoms are 6.02 x 10²³

The number sulphur atom are 6.02 x 10²³

The volume occupied by 1.4 g on N₂at S.T.P is

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2.24 dm³

22.4 dm³

1.12 dm³

112 cm³

The total number of protons and neutrons present in the nucleus of an atom is called.

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Mass number

Atomic number

Molecular mass

Relative atomic mass

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