Question # 1

which one of the following is not a nucleophile?

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H₂O

H₂S

BF₃

NH₃

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Temperature is increased

Pressure is increased

HCl is added

HCl is removed

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Non polar R group

Polar R group

Acidic R group

Metallic R group

A reaction is reversible because :

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Products are stable.

Reactants are reactive.

Products are reactive.

Reactants re stable.

Which one of the following reagents will distinguish between C₆H₅CHO and C₆H₅COCH₃

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Aqueous bromine

Phosphorus pentachloride

2, 4 DNPH

Tollen's reagent

Subsidiary quantum number specifies

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size of orbital

shape of orbital

orientations of orbitals

Nuclear stability

Depletion of ozone layer is due to

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Oxides of nitrogen

Oxides of carbon

Oxides of sulphur

None of the above

The addition of unsymmetrical reagent to unsymmetrical alkene is in accordance with the rule:

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Hund's rule

Markownikov's rule

Pauli's Exclusion Principle

Auf bau Principle

Which of the following species participate in sulphonation of benzene ring?

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H2SO4

HSO4

SO3

SO^-₂

When the 6d orbital is completed the entering electron goes into

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7f

7 s

7 p

7 d

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0 dm³

3 dm³

2 dm³

3 dm³

For the representative elements from left to right across a period in the periodic table, the electron effinity of the atom generally

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Increases

Remains constant

Decreases

Not clear

The toxic organic compounds and heavy metals and metalloids results in contamination of

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Surface water

Ground water

Both surface and ground water

Neither surface nor ground waters

The digestion of fats in the intestines is aided by

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Diffusion

Protection

Peptization

Emulsification

E₁mechanism is generally shown by

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1° - RX

2° - RX

3° - RX

None of these

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

Bessemer converter is used in the manufacture of

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Pig iron

Steel

Wrought iron

Cast iron

CFCs undergo homolytic fission by uv light in the stratosphere which radical could result from this irradiations of CHCICF₂Cl.

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CHF Cl C FCl

CH Cl CF₂Cl

CHF CF₂Cl

C FCl CF₂Cl

Which colour is imparted by sodium

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Yellow

Violet

Red

Crimson

Analytical chemistry is the science of

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Chemical characterization

Physical characterization

Biological characterization

Biochemical characterization

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2, 2, 4-trimethylpentane

2, 4, 4-trimethylpentane

2, 4, 4-methyepentane

2, 2, 4-methylpentane

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di(4-bormophenyl) method

Methanol

Propan-1-ol

Propan-2-ol

Lead accumulator stops discharging current when

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Lead at anode converted to PbO₂

PbO₂at cathode converted to Pb

Both electrodes are completely covered with PbSO₄

Both electrodes are completely covered with Pb(OH)₂

A nucleoside may be

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Ribonuleoside

Deoxyribonucleoside

Both a and b

None

Which of the following compounds is explosive in nature?

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Phosphorus trichloride

Nitrogen trichloride

Hyponitrous acid

Nitrosyl chloride

Alkanes are soluble in all except

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Benzene

Ether

Water

Carbon tetra chloride

Which of the following is not an example of addition polymer?

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Polyethene

Polystyrene

Neoprene

Terylene

When quantity of electricity passed is one faraday then the mass deposited at the electrode is equal to

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One gm, atomic weight

One gm, Equivalent

Eletrochemical equivalent

None of the above

Density of aluminium is (g cm^-3):

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B

Al

Si

Ge

Which of the following favours the reverse reaction in chemical equilibrium?

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Increasing the concentration of the reactant

Removal of the least one of the products at regular intervals

Increasing the concentration of one or more of the products

None of these

Which heavy metals do not have any safe limits

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As

Hg

Cr

All of these

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