Question # 1

Haemoglobin is a Macro molecule and consists of approximately atoms.

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5000

10,000

68000

15000

The mass of one mole of electrons is

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1.008 mg

0.55 mg

0.184 mg

1.673 mg

Calcium has isotopes

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7

9

1

6

More abundant isotope of an element is the one with.

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Even atomic number

Odd atomic number

Even mass number

Odd mass number

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.

The mass of one mole of electrons is.

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1.008 mg

0.55 mg

0.184 mg

1.673 mg

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

If four moles of sulphur dioxide are oxidized to sulphur trioxide, how many moles of oxygen are needed.

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0.5

1.0

1.5

2.0

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

The element nickel has isotopes.

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3

2

5

7

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

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2.24 dm3

22.4 dm3

1.12 dm3

112 cm3

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

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

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0.2

0.4

0.6

0.8

Tin has isotopes.

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9

10

11

12

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

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