Question # 1

Density of water becomes maximum at

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10°C

4°C

5°C

12°C

Total number of valence electrons in CH4

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8

9

10

12

The proteins which give an amino acid and non-protein group on hydrolysis are known as

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Derived protein

Albumins

Conjugated simple protein

Conjugated protein

An alkyl halide reacts with NH3 to give

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Amide

Cyanide

Amine

Aniline

99.5% mass of lithosphere is made of

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03 elements

8 elements

11 elements

15 elements

The working condition/s for SHE

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1atm pressure

1M H-solution

298K temperature

All of these

What is the formula of talc or soapstone?

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Na2B4O7.10H2O

H2Mg3(SiO3)4

Cu2S

NaNO3

Amorphous solids:

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have sharp melting point

undergo clean cleavage when cut with knife

have prefect arrangement of atoms

can possesses small regions of orderly arrangement

The morality of the solution containing x grams ammonium sulfate in 500cm3 of the solution is 0.6 what is x?

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39.6

40.5

42.7

45.1

Formic acid is given name from Latin word a "formic" which means:

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Red out

Vinegar

Butter

Milk

Zwitter ion are

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Basic

Acidic

Neutral

Carry both -ve and +ve charges

Clemensen's reduction of ketones is carried out in

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H₂with Pd catalyst

Glycol with KOH

LiAIH₄in water

Zn-Hg with conc. HCl

Which of the following reagents is used to distinguish between methanoic acid and ethanoic acid?

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Amm. silver nitrate solution

Neutral ferric chloride

Sodium hydroxide solution

Sodium carbonate solution

Which one of the following does not belong to alkaline earth metals

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Be

Ra

Ba

Rn

The natural fertilizers consist of

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Plants

Animals

Both plants and animals

Microorganisms

Which of the following salt is soluble in water

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CaCO₃

CaSO₄

MgSO₄

BaSO₄

Benzene is stable to:

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Oxidation

Nitration

KMnO₄

SULPHONATION

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

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Reduction

Both (a) and (c)

Oxidation

No reaction occurs

Heat,. work and internal energy of the system and surroundings are related into an equation which is called

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First law of thermodynamics

Hess's law

Henry's law

Born-haber cycle

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

General formula of alkyl halide is:

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R----X

R----OH

R------COH

R------COOH

Plastics are a pollution problem because many plastics

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Are made from petroleum

Are very inflammable

Burn to produce toxic fumes

Decompose to produce toxic products

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