Question # 1

In molecules kinetic and potential energies are:

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Definite

Moderate

Indefinite

None of above

The percentage of which element in the organic compound is determined by the difference method

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Carbon

Hydrogen

Nitrogen

Oxygen

Formation of a cation is:

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Exothermic process

Non-endothermic process

Endothermic process

None of above

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

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110

100

125

90

The atom of an element is

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The smallest particle

The fundamental particle

The independent particle

The charged particle

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N₂O₄is limiting reactant

N₂H₄is the limiting reactant

Reactants are completely converted to the products

Reactions is reversible

Macromolecules are

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organic molecules

High molecular mass molecules

Natural compounds

Rarely occurring molecules

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

The mass of one mole of proton is

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1.008 g

0.184 g

1.673 g

1.008 mg

Atoms and molecules can either gain or lose electrons, forming charge particles called:

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Positrons

Photons

Ions

Electrons

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8 g

16 g

32 g

24 g

One of the following statements is incorrect

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Actual yeild is always less than the theoretical yield

The formula of a compound is not definite

Law of conservation of mass is applied in stoictiometry

Boyles law is applied in stoichiometry

The branch of science dealing with structure, composition and changes in matter and laws and principles which govern these changes is called as

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chesmistry

Geology

Physics

Mechanics

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

Which of the sub-atomic particles is not charged

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Electron

Proton

Neutron

All of them

The percentage of H is the highest in

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CH₄

NH₃

H₂SO₄

C₆H₁₂O₆

If four moles of sulpur dioxide are oxidised to sulphur trioxide, how many moles of oxygen molecules are required

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0.5

1.0

1.5

2.0

Isotopes of an element differ in

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Number of protons

Number of electrons

Number of neutrons

Number of electrons and protons

A compound contains one atom of oxygen and % of O 34.78, then molecular mass of compound is

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46

78

110

180

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