Question # 1

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

Al³⁺is a symbol for aluminium

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Atom

Ion

Cation

Anion

A molecule of haemoglobin is made up if nearly

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10,000 atoms

50,000 atoms

2500 atoms

1500 atoms

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84.84 %

89.89%

81.81%

90.90%

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

He Ar and Ne are:

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Mono-atomic molecules

Hetero atomic molecules

Poly-atomic molecules

Diatomic molecules

Objects of the size of an atom can be observed in

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An electron microscope

An x-ray spectrum

Atomic absorption spectrum

A visible spectrum

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

In molecules kinetic and potential energies are:

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Definite

Moderate

Indefinite

None of above

Benzene is stable to:

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Oxidation

Nitration

KMnO₄

SULPHONATION

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

What is the maximum mass of aluminium which can be obtained from 240g of aluminium oxide Al₂O₃?

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26 g

127 g

51 g

108 g

Smallest particle of an element which may or may not have independent existence is known as:

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A molecule

An ion

An atom

An electron

The negatively charged particles are called

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Cation

Radical

Anion

Positron

A compound X contains 50% sulphur and 50% oxygen by mass. What is the empirical formula of compound X?

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SO

SO₂

SO₃

SO₄

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

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 value of R(General Gas Constant) is

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8.3134 JK^-1mole^-1

1.987 Cal K^-1Mole^-1

Both a and b

1.987 JK^-1mole^-1

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

The wave length of visible light is 500 nm. In S.I. unit this value is

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5 x 10^-8m

5 x 10^-9m

500 x 10^-7m

500 x 10^-9m

A limiting reactant is one which according to the stoichiometric equation

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Has excess mass

Has least mass

Has excess number of moles

Has least number of moles

The isotopes of an element

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Possess same mass number

Possess same number of protons

Do not possess same chemical properties

May or may not possess same chemical properties

The atomic mass is measured in atomic mass unit (a.m.u.) which is equal to

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1.661 x 10^{-27- Kg}

1.661 x 10^-24Kg

1.661 x 10^{-27- g}

1.661 x 10^-24mg

A ring contains 3 gram diamond. The number of C-atoms which a ring contains is

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3.01 x 10²³

1.5 x 10²³

6.02 x 10²⁴

3.01 x 10²⁴

Isotopes differ in the

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Number of neutrons

Number of protons

Number of electrons

Number of atoms

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

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Carbon

Hydrogen

Nitrogen

Oxygen

One mole of ethanol and one mole of ethane have an equal

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Mass

Number of atoms

Number of electrons

Number of molecules

The empirical formula of a compound is CH₂O. What may be the compound

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C₂H₅OH

C₆H₅OH

HCOOH

Hemoglobin is 68000 times heavier than:

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Oxygen atom

Nitrogen atom

Carbon atom

Hydrogen atom

Atoms can be evident by use of electron microscope, field ionization microscope and:

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x-rays

Video camera

Telescope

Compound microscope

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