Question # 1

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

C₆H₁₂O₆and C₁₂H₂₂O₁₁ are:

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Mono-atomic molecules

Diatomic molecules

Poly-atomic molecules

Hetero atomic molecules

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

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99.2%

99.5%

90.5%

96.2%

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]

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

Metal tend to lose electrons, becoming:

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Metals

Positively charged

Negatively charged

(a)And (c)

The atom of an element is

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The smallest particle

The fundamental particle

The independent particle

The charged particle

When an electron is added to a uni positive ion we get:

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Cation

Molecule

Neutral atom

Anion

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

Hemoglobin contains nearly:

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10,000 atoms

100 atoms

1000 atoms

1 atom

He Ar and Ne are:

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Mono-atomic molecules

Hetero atomic molecules

Poly-atomic molecules

Diatomic molecules

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

The volume occupied by 1.4 g of N₂at S.T.P is

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2.24 dm³

22.4 dm³

1.12 dm³

112 cm³

The phenomenon of isotropy was first discovered by

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Soddy

Rutherford

Bohr

Dalton

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

The mass of one mole of proton is

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1.008 g

0.184 g

1.673 g

1.008 mg

Which of the following compounds contains the highest percentage by mass of nitrogen?

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Ammonia, NH₃

Ammonium carbamate, NH₂CO₂NH₄

Ammonium carbonate, (NH₄)₂CO₃

Hydrazine, N₂H₄

0.5 mole of CH₄and 0.5 mole of SO₂gases have equal

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Volume

Mass is gram

Total number of atoms

Number of molecules

How many moles of hydrogen atoms does 3.2 g of methane, CH₄, contain?

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0.02

0.2

0.4

0.8

CO+ is an example of

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Stable molecule

Anionic molecule ion

Cationic molecular ion

Free radical

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

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C₂H₅OH

C₆H₅OH

HCOOH

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

Which statement about an atom is true ?

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The number of neutrons is not equal to number of electrons

Mass number is less than atomic number

All the elements have only one mass number

Mass number can be equal to atomic number

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

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 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

Benzene is stable to:

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Oxidation

Nitration

KMnO₄

SULPHONATION

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

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

Matter is defined as any thing which occupies space and:

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Molecules

Mass

Compound

Molecules

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