Question # 1

During electrolysis, the reaction that takes place at cathode is :

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Reduction

Both (a) and (c)

Oxidation

No reaction occurs

Which of the statements given below concerning properties of solution, describe a colligative effect?

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Boiling point of pure water decreases by the addition of ethanol

Vapour pressure of pure water decreases by the addition of nitric acid

Vapour pressure of pure benzene decreases by the addition of naphthalene

Boiling point of pure benzene increases by the addition of toluene

The radius of first orbit of hydrogen atom

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0.329 A°

0.429 A°

0.529 A°

0.229 A°

Macromolecules are

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organic molecules

High molecular mass molecules

Natural compounds

Rarely occurring molecules

The total number of orbitals possible for the quantum number n is

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n

n²

2n

2n²

Keeping in view the size of atoms, which order is the correct one

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Mg > Sr

Ba > Mg

Lu > Ce

Cl > l

When electrically is passed through molten Al₂O₃+ Na₃AlF₆and 13.5 gms of Al are deposited, the number of farady must be

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0.5

1.0

1.5

2.0

When a compound X is passed through a dilute alkaline solution of KMnO₄the pink colour of solution is discharged. The compound X is possbibly

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Methane

Ethane

Ethene

Benzene

Ecosystem is a smaller unit of

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Hydrosphere

Lithosphere

Biosphere

Atmosphere

Formula of chloroform is:

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CH₃Cl

CCl₄

CH₂Cl₂

CHCl₃

If the rate of reaction is independent of the concentration of the reactant, the reaction is of

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Zero order

First order

Second order

Third order

Which of the following is not aromatic hydrogencarbon

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Benzene

Naphthalene

Toluene

Cyclohexene

Direct conversion of solid into vapors is called :

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Crystallization

Sublimation

Obligation

Vaporization.

Commercial common salt becomes slight damp on storing because

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Common salt is hygroscope

Common salt contains some impurity, which is hygroscopic

Salt in efflorescent

Salt is crystalline

The open chain compounds are also called

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Aliphatic

Alicylic

Aromatic

Both a and b

Which of the sub-atomic particles is not charged

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Electron

Proton

Neutron

All of them

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Electrophilic addition

Electrophilic substitution

Free radical substitution

Nuclophilic addition

Catalyst in the reaction ROH + SOCl₂-------> RCL+SO₂+HCl is:

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ZnCl₂

Pyridine

H₂SO₄

Either

Which of the followings is not a nulceophile

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OH^-

NH₃

C₂H₅O^-

Br₂

Which one of the following is not air pollutant gas

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CO

CO₂

NO

SO₂

The prosthetic group in glycoprotein is

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Carbohydrate

Fat

Vitamin

Nucleic acid

Oxidation reduction is done by

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Oxidoreductase

Lipases

Lyase

None of these

Sintered glass is porous material used for:

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Absorption

Decoration

Filtration

All of above

A single benzene ring can have ______ ortho position maximally

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One

Two

Three

Four

Any other aldehyde except formaldehyde on reaction with Grignard's will produce

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Secondary alcohol

Primary alcohol

Tertiary alcohol

Aromatic alcohol

In the reaction of oxalic acid with KMnO₄and H₂SO₄is slow at the beginning but after sometimes the reaction becomes faster due to

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Formation of MnSO₄which acts as 'Auto catalyst

Formation of CO₂which acts as 'Auto catalyst

Formation of K₂SO₄which acts as 'Auto catalyst

Evolution of O₂gas which acts as 'Auto catalyst

F₂, Cl₂, Br₂and l₂lie below SHE is the Electro chemical series that is why these

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Undergo reduction

Undergo oxidation

Liberate H₂gas with steam

None of these

An electron has principal quantum number 3. The number of its 1 subshell and 2 orbitals would be respectively

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3 and 5

3 and 7

3 and 9

2 and 5

0.5 M of H₂SO₄is diluted from 1 litre to 10 litre, normality of resulting solution is

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1 N

0.1 N

10 N

11 N

The rate of reaction :

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Remain same as reaction proceeds.

May decrease or increase as reaction proceeds .

Increase as reaction proceeds.

Decreases as reaction proceeds.

NaHCO₃is prepared by

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Down's process

Solvay's process

Nelson's process

None of these

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