Question # 1

There are _________ types of bonds.

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1

2

3

4

The solubility of which salt increases in heating?

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Li₂SO₄

Ce₂(SO₄)₃

NaCI

KCI

When U-235 breaks up, it produces?

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electrons

neutrons

protons

nothing

____________ solids are arranged in 3 dimension.

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Crystalline

Amorphous

Both

None

Gases produced in Nelson's cell are:

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H₂ and O₂

H₂ and CI₂

H₂ and N₂

CI₂ and O₂

"Atoms" means _________

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Divisible

Indivisible

Break

Nil

During the formation of water from hydrogen and oxygen, which of the following does not occur?

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Hydrogen has oxidized

oxygen has reduced

oxygen gains electrons

hydrogen behaves as oxidizing agent

Which one of the following halogen has lowest electronegative?

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fluorine

chlorine

bromine

iodine

Scientist used ___________ method.

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Scientific

Non-scientific

Bot

Non

CO2 the oxidation number of C =.

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+1

+2

+3

+4

The symbol of lead us

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As

Pb

Sb

Na

Who was prepared acetic acid in laboratory?

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Berzelius

Wohler

Kolbe

Dalton

Which gas is used to prepare ammonia?

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N₂

O₂

Cl₂

S

How many percentage to water contains oceans?

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67%

77%

87%

97%

Coal is blackish complex mixture of compounds of

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Carbon

Hydrogen

oxygen

All

Percentage of carbon in peat is.

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50%

60%

70%

80%

Which of the following in insoluble in water.

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Benzene

NaCl

KCl

All of them

Active mass is expressed as:

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{ }

[ ]

( )

l l

Mesosphere has a temperature range.

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17 ^oC - 58^oC

58^oC - 2^oC

2^oC - 93^oC

- 93^oC

Acid rain affects the aquatic life by clogging fish gills because of:

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Lead metal

Chromium metal

Mercury metal

Aluminium metal

The most important oligosaccharide is:

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Sucrose

Glucose

Fractose

Maltose

At equilibrium state, when reaction cases to proceed, it is called:

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equilibrium constant

dynamic equilibrium

static equilibrium

simple equilibrium

Select the correct answer out of the following alternative suggestions London dispersion forces are the only forces present among the.

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Molecules of water in liquid state

Atoms of helium is gaseous state at high temperature.

Molecules of solid I2

Molecule of H-Cl gas

The molar volume of CO₂is maximum at

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STP (0°C and 1 atm)

127° C and 1 atm

0°C and 2 atm

273°C and 2 atm

If 2 mol of an ideal gas at 546 K occupy a volume of 44.8 dm3, the pressure must be.

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1 atm

2 atm

3 atm

4 atm

Depression in the F.P is directly proportional to

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Molarity of solution

Molarity of solvent

Molality of solvent

Molality of solution

How many molecules of CO2 are formed by burning 12 g carbon with excess of oxygen.

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3.01 x 10²³

1 x 10²³

6.02 x 10²³

1.03x 10²³

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Fe is reduced

Fe is oxidized

CI₂is oxidized

None of these

That cell in which electrical energy is converted into chemical energy is called

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Galvanic cell

Electrolytic cell

Fuel cell

Daniel cell

Which of the following species has unpaired electrons in antibonding molecular orbitals.

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O2⁺²

N2^-2

B2

F2

At constant volume of a system remains constant and the heat is absorbed by the system, them amount of heat absorbed is called

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Enthaply change of the system

Internal energy change of the system

Total enthalphy of the system

Total internal energy of the system

Which one of the following molecules is paramagnetic.

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H2

He

N2

O2

Boiling point of a liquid is high when

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There is no hydrogen bonding

Dipole moment is zero

Inter molecular forces are weak

Hydrogen bonding is present

Which of the following derivative cannot be prepared directly from acetic acid

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Acetamide

Acetyl choride

Acetic anhydride

Ethyl acetate

The nitrogen present to some fertilizers helps plants to

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Fight against diseases

Produce fat

Undergo photosynthesis

Produce protein

Which chemicals used for detection of amino acids.

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NaOH + I2

Phenyl hydrazine

Ninhydrin

Benedict's solution

In which reactions alkane is not produced

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Subatier's and Sendern reaction

Koibe's reaction

Wolf -Kishner's reduction

Dow's process

Which one of the following elements burns in air to form an oxide which, when shaken with water, give a solution with a pH greater than 7.

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Carbon

Magnesium

sulphur

Hydrogen

Which one of the following is not a nucleophile.

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H2O

H2S

BF3

NH3

Which are correct oxidation states for lead

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+1, +2

+3 , +5

+2 ,+4

+4 only

Arsenic impurities in contact process are removed.

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By prolong heating the gases

By treatment with Fe(OH)3

In scrubbing tower

In absorption tower

Which property of triglycerides is used to determine its molecular mass.

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acid number

Saponification number

Iodine number

gold number

Which is used in the leather industry

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Borax

Boric acid

Boric oxide

Tetra Boric acid

Which is an aromatic compound

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Anthracene

Naphthalene

Toluene

All of the these