Question # 1

Stoichiometric calculations cannot applied to reversible reactions because.

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Product again changes to reactant

Less product is formed

Reaction goes only in one direction

Products do not disappear.

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

In Al2O3, the ratio between the ions is

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1 :2

2:1

2:3

3:2

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.

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

Which is not a molecular ion.

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He+

CH3+

NH3-

CO+

One mole of Carbon -12 has mass

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0.012 kg

1 kg

0.022 kg

12 kg

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

One mole of SO2 contains

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6.02 x 10²³atoms of oxygen

18.1 x 10²³atoms of SO2

6.02 x 10²³atoms of Sulphur

4 g atoms of SO2

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 smallest collection of ions in an ionic compound is called.

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Formula unit

Chemical formula

Formula mass

Molecular formula

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 Number of moles of CO2 which contain 8.0 of oxygen.

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0.25

0.15

0.35

1.45

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

Nickel has isotopes

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3

5

6

11

Actual yield is mostly less than the theoretical yield due to the reason that

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Rates of reactions are slow

Loss of the product during handling

Reactions are never completed 100%

Law of conservation of mass is not true

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