Question # 1

The number of subatomic particles in atoms sidcovered is more than:

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110

100

125

90

The relative abundance of Pb isotopes is 1.5% Pb²⁰⁴, 23.6% Pb²⁰⁶, 22.6% Pb²⁰⁷, 52.3% Pb²⁰⁸The relative atomic mass of Pb is

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207.94

208.24

206.94

207.24

Which one of the following statements is not correct

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A molecule is the smallest particle of an element which can exist independently

He is a molecule of helium

S₈is a molecule of sulphur

O₃is a molecule of oxygen

Where energy is released during a reaction it is

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Exothermic reaction

Endothermic reaction

A free radical reaction

A bond breaking reaction

Which has greater number of moles

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0.1 g sodium

6.02 x 10²⁰atoms of magnesium

20 cm³0.1mole per dm³of NaOH

12.2 dm³of nitrogen at standard

[A_rNa = 23, Mg = 24, O = 16]

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84.84 %

89.89%

81.81%

90.90%

Hemoglobin is 68000 times heavier than:

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Oxygen atom

Nitrogen atom

Carbon atom

Hydrogen atom

NH₃, HCL, H₂O, HL are:

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Diatomic molecules

Poly-atomic molecules

Mono-atomic molecules

Hetero atomic molecules

Covalent compound s mostly exist in the form of:

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Protons

Atoms

Neutrons

Molecules

X-ray work has shown that the diameters of atom are of the order of

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8 x 10^-10m

2 x 10^-10m

8 x 10^-8m

2 x 10^-8m

1.12 dm³of N₂gas at S.T.P. has mass of N₂gas

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2.8 g

2.4 g

1.4 g

14 g

The quantitative relationship between the substances according to balanced equation describes

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Reversible reactions

Stoichiometry

Limiting reacting

Percentage composition

Which of the following statements is not true?

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Isotopes with even atomic masses are comparatively abundant

Isotopes with even atomic masses and even atomic numbers are comparatively abundant

Isotopes with even atomic masses and odd atomic number are comparatively abundant

A balloon contains 0.02 gram of H₂gas, it contains H₂molecules

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6.02 x 10²³

3.01 x 10²²

6.02 x 10²¹

3.01 x 10²¹

When nitrogen is 5.6 grams in NO₂. then number of moles of NO₂is

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0.5

0.4

0.04

0.05

Determination of atomic masses and invention of system of writing symbols was made by:

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J. Berzelius

Democritus

Dalton

None of above

The amount of products obtained from the balanced chemical equation is regarded as

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Theoretical yield

Actual yield

% yield

Experimental yield

Benzene is stable to:

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Oxidation

Nitration

KMnO₄

SULPHONATION

The phenomenon of isotropy was first discovered by

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Soddy

Rutherford

Bohr

Dalton

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300 cm³

200 cm³

150 cm³

100 cm³

Mass spectrometer measures the

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Exact mass of an element

Average mass of an element

The number of elements present in a molecule

m/e value of a positive ion

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99.2%

99.5%

90.5%

96.2%

The mass of sulphur which combines with 24 grams oxygen to form SO₂

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32 gram

24 gram

8 gram

12 gram

A beaker contains 9 grams of water. The number of H atoms is

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6.02 x 10²³

3.01 x 10²³

6.02 x 10²⁴

3.01 x 10²⁴

Ascorbic acid contains 40.92% carbon, 4.58%, hydrogen and 54.4% oxygen. The empirical formula is

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C₃H₄O₃

C₂H₄O₃

C₃H₅O₄

C₂H₃O₁

Isotopes differ in the

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Number of neutrons

Number of protons

Number of electrons

Number of atoms

The relative atomic mass of chlorine is 35.5. What is the mass of 2 mol of chlorine gas

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142 g

71 g

35.5 g

18.75 g

Macromolecules are

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organic molecules

High molecular mass molecules

Natural compounds

Rarely occurring molecules

One mole of C₂H₅OH contains the number of H-atoms

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6.02 x 10²³

3.61 x 10²⁴

1.81 x 10²⁴

6.02 x 10²⁴

He Ar and Ne are:

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Mono-atomic molecules

Hetero atomic molecules

Poly-atomic molecules

Diatomic molecules

Relative atomic mass of an element is the mass of the element relative to

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1/12 mass of carbon-12

1/12 mass of carbon

1 mass of hydrogen atom

1/16 mass of oxygen

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