Question # 1

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

The atom of an element is

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The smallest particle

The fundamental particle

The independent particle

The charged particle

The pressure of vapours when sent to the ionization chamber in mass spectrometer is

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10^-5to 10^-6torr

10^-6to 10^-7torr

10^-7to 10^-8torr

10^-3to 10^-4torr

Benzene is stable to:

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Oxidation

Nitration

KMnO₄

SULPHONATION

In molecules kinetic and potential energies are:

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Definite

Moderate

Indefinite

None of above

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300 cm³

200 cm³

150 cm³

100 cm³

The phenomenon of isotropy was first discovered by

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Soddy

Rutherford

Bohr

Dalton

Who one mole of each of the following is completely burned in oxygen, which gives the largest mass of carbon dioxide?

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Carbon monoxide

Diamond

Ethane

Methane

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84.84 %

89.89%

81.81%

90.90%

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8 g

16 g

32 g

24 g

Hemoglobin is 68000 times heavier than:

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Oxygen atom

Nitrogen atom

Carbon atom

Hydrogen atom

C₆H₁₂O₆and C₁₂H₂₂O₁₁ are:

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Mono-atomic molecules

Diatomic molecules

Poly-atomic molecules

Hetero atomic molecules

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

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Carbon

Hydrogen

Nitrogen

Oxygen

Covalent compound s mostly exist in the form of:

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Protons

Atoms

Neutrons

Molecules

First atomic theory was put forward by an English school teacher:

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Maxewell

Newton

Sanger

John Dalton

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

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

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

CL₂, N₂ and O_{2 are:}

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Diatomic molecules

Hetero atomic molecules

Poly-atomic molecules

Mono-atomic molecules

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

An ion bearing positive charge is called:

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Cation

Positron

Anion

None of above

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

A molecule of haemoglobin is made up if nearly

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10,000 atoms

50,000 atoms

2500 atoms

1500 atoms

He Ar and Ne are:

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Mono-atomic molecules

Hetero atomic molecules

Poly-atomic molecules

Diatomic molecules

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 following statement is correct for a chemical reaction to occur molecules of substances must

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Collide with each other

Collide with energy more than activation energy

Collide with energy less than activation energy

Collide with high frequency

The empirical formula of a liquid compound is known to be C₂H₄O. What other information is needed to work out its molecular formula?

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The percentage composition of the compound

The relative molecular mass of the compound

The density of the compound

The volume occupied by one mole of the compound

A molecular ion is formed by

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Passing a high energy electron beam through gaseous molecule

Dissolving a salt i dilute acid

Passing electric current through molten salt

Passing electricity through aqueous solutions

Which one of the following step is not involved in determination of empirical formula

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Determination % of each element

Determination of gram atom of each element

Determination of isotopes of each element

Determination of atomic ratio of element

The relative abundance of the ions with a definite m/e value is measured by

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High pressure of vapours

Strength of electric current measured

Quantity of fast moving electrons

Electron gas

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