Question # 1

The osmotic pressure of solution increases if

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Temperature is decreased

Solution constant is increased

Number of solute molecules are increased

Volume is increased

The active part in a molecule is called

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Homologous series

Functional group

Chemical bonding

Ionic complex

When acetamide reacts with Br₂and caustic soda, then we get

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Acetic acid

Bromoacetic acid

Methyl amine

Ethylamine

Crystalline form of sulphur stable at room temperature is

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Rhombic sulphur

Monoclinic sulphur

Plastic sulphur

Prismatic sulphur

Macromolecules or polymers are large molecules built up from small molecules called monomers. This hypothesis put forward by

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Schrodixger

Standinger

Lewis

Newton

Alkyne is :

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CH_3-CH₃

CH₄

CH₂₌CH₂

C₂H₂

Which is liquid among the following alkenes?

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Ethane

Propene

Butene

Pentene

The third line of the Balmer series, in the emission spectrum of the hydrogen atom,is due to the transition from the

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Fourth Bohr orbit to the first Bohr orbit

Fifth Bohr orbit to the second Bohr orbit

Sixth Bohr orbit to the third Bohr orbit

Seventh Bohr orbit to the third Bohr orbit

The number of isotopes of gold is

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3

1

2

4

The electron releasing effect of methyl group is significant and it makes ring a good

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Electrophilic

Nucleophilic

Nucleophobic

Hydrophobic

Potassium chromate has formula

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KClO₃

K₂CO₃

K₂CrO₄

K₂Cr₂O₇

Which of the following salts mixed with ice to make the freezing mixture used in ice cream machine

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KNO₃

NH₄NO₃

AgNO₃

Mg(NO₃)₂

Sulphuric acid reacts with PCl₅to give

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Thionyl chloride

Sulphur monochloride

Sulphuryl chloride

Sulphur tetrachloride

The heat energy change during a chemical reaction at constant pressure and at a given temperature is called

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Change in internal energy

Enthaply change

Temperature change

Work done by the system

In a hydrogen-oxygen fuel cell, combustion of hydrogen occurs to

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Generate heat

Remove adsorbed oxygen from electrode surfaces

Produce High purity water

Create potential difference between two electrodes

The process in which orbitals of different energies and shapes mix up with each other to give equivalent is called,

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Hybridization

Polymerization

Isomerisation

Carbonization

An oil or fat with no double bond have iodine number:

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Zero

100%

50%

Minimum

Which one of the followings is a heterocyclic compound

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Cyclohexanol

Phenol

Pyridine

Anthracene

In an exothermic reaction, a 10° rise in temperature will

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Decrease the value of equilibrium constant

Double the value of K_c

Not produce any change in K_c

Produce some increase in K_c

Which statement explains the observation that magnesium hydroxide dissolve in aqueous ammonium chloride, but not in aqueous sodium chloride

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The ionic radius of the NH₄⁺ion is similar to that of Mg²⁺but not that of Na⁺

NH₄Cl dissociates less fully than NaCl

The ions Na⁺and Mg²⁺are isoelectronic (have the same number of electrons)

The ion NH⁺₄acts as an acid

When aqueous solution of NaOH is electrolysed useing graphite electrodes, the product obtained at anode is

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O₂gas

H₂gas

Na metal

Na₂O

The charge of an electron is determined by

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J.J. Thomson

Crooks

Perrin

R.A.Millikan

At certain temperature, 50% of HI is dissociated into H₂and I₂the equilibrium constant is

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1.0

3.0

0.5

0.25

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

The order of reactivity of halogen acids for reaction with C₂H₅OH is

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HCl > HBr > HI

HI > HBr > HCl

HBr > HI > HCl

HBr > HCl > HI

(A) is one molar NaCl solution and (b) is 1 molal NaCl solutin :

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A and B are of same strength.

A is more Concentrate than B.

b is more Concentrate than A.

None of above.

Which one of the following substance is no used as drying agent in desiccators

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Silica gel

CaCl₂

Phosphorous

NaCL(50%)

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

DDT is

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Biodegradable pollutant

Nondegradable pollutant

Not a pollutant

An antibiotic

In aldol condensation reaction, a double bond is formed between ______ and ______ carbon atoms

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αandβ

αandα

αand Y

None of these

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Moles per dm³

Partial pressures

Number of moles

Mole fractions

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