Question # 1

Non-metals are generally soft, but which one of the following is extremely hard?

Choose an answer

Graphite

Phosphorus

Iodine

Diamond

The branch of chemistry which deals with inter conversion of electrical & chemical energy is:

Choose an answer

Biochemistry

Electrochemistry

Organic chemistry

None of these

Which one of the following does not affect the boiling point?

Choose an answer

intermolecular forces

external pressure

nature of liquid

initial temperature of liquid

Mark the incorrect statement about ionization energy:

Choose an answer

it is measured in Kjmol^-1

it is absorption of energy

it decreases in period

it decreases in a group

NaOH is prepared by ____________ of NaCL (aqueous).

Choose an answer

Electrolysis

Decomposition

A & B

Nil

Energy of a shell is ________________

Choose an answer

Variable

Constant

Cannot be changed

Nil

L shell can accommodate ________________ electrons.

Choose an answer

2

8

18

32

CO2 the oxidation number of C =.

Choose an answer

+1

+2

+3

+4

Hydrogen has ________________ isotopes.

Choose an answer

1

2

3

4

Which one is least reactive non-metal?

Choose an answer

P

C

CI

F

Which one of the following is an electron deficient molecule?

Choose an answer

HN₃

BF₃

N₂

O₂

Which one of the following is not the characteristics of monosaccharide?

Choose an answer

White crystalline solids

Soluble in water

Hydrolysable

Reducing is nature

Which base is more corrosive?

Choose an answer

NH₄OH

NaOH

Ca(OH)₂

AL(OH)₂

The dynamic equilibrium in irreversible reaction.

Choose an answer

Never establishes

Establishes after completion of reaction

Establishes before completion of reaction

Establishes very soon

Grease stains from clothes are removed by sing.

Choose an answer

Ammonium nitrate

Aluminium hydroxide

Ammonium hydroxide

Aluminum chloride

The depletion of which gas results in the death of aquatic life.

Choose an answer

Oxygen

Carbon di oxide

Boath of them

Nome of them

Incomplete combustion of alkanes produce.

Choose an answer

Carbon dixoide only

Carbon monoxide only

Carbon monoxide carbon black and water

Carbon dioxide and carbon black

Which one of the following does ot contain protein

Choose an answer

Pulses

Potatoes

Beans

eggs

Organic compounds contain:

Choose an answer

ionic bond

Covalent bond

Metallic bond

Co-ordinate covalent

A group of gases that maintains temperature of atmosphere is.

Choose an answer

Carbon dioxide and water vapours

Nitrogen and carbon dioxide

Thermosphere

Troposphere

In forth flotation process the ore particles are preferentially wetted by:

Choose an answer

water

oil

benzene

petrole

Freezing point of water is:

Choose an answer

-4°C

0°C

-36°C

-58°C

One of the following substances is not used as a drying reagent in a desiccator

Choose an answer

Cons. H₂SO₄

P₂O₅

Silica gel

50% KOH

Which one of the following inter molecular forces are present in neon gas molecules.

Choose an answer

Hydrogen bond

dipole -Dipole attraction

London dispersion force

Hydrogen bonding and London dispersion force

Solubility of which substance decreases by incressing temperature.

Choose an answer

NaNO3

KNO2

NaCl

Ce2(SO4)3

If the empirical formula of compound is CH2 and its molecular mass is 56 than what is the actual molecular formula of this compound.

Choose an answer

CH2

C2H4

C3H6

C4H8

Molal boiling point elevation depends upon

Choose an answer

Nature of solvent

Natrue of solute

Vapour pressure of solution

None of these

Two solutions of NaCl and KCl are prepared separately by dissolving same amount of the solute in water. Which of the following statements is true for these solution.

Choose an answer

KCl solution will have higher boiling pint than NaCl solution

Both the solutions have different boiling point

KCl and NaCl solutions possess same vapour pressure

KCl solution possesses lower freezing point than NaCl solution

Chromatography involves the distribution of a solute between.

Choose an answer

Two stationary phases

Two mobile phases

A stationary phase and a mobile phase

Two stationary and two mobile phase.

An azeotropic mixture of two liquids boils at lower temperature than either of them when.

Choose an answer

It is saturated

It shows positive deviation from Raoult's law

It shows negative deviation from Raoult's law

It is metastable

If temperature of one mole of ideal gas at 273 K and one atmospheric pressure is increased by 1 K, amount of energy absorbed is.

Choose an answer

0.082 dm3 atm

1.987 cal.

8.313 J

All are correct.

What is the oxidation state of sulphur in SO3^2-

Choose an answer

-4

-2

+2

+4

Heat of solution of an ionic compound is equal to.

Choose an answer

Hydration energy

Lattice energy

Slum of both 'a' and 'b'

Difference of both a and b

In which substance phosphorus is not present.

Choose an answer

Yolk of egg

Bones

Apatite

Galena

Which one the following a dihydric alcohol

Choose an answer

Ethanol

Cyclo hexanol

Glycerol

Glycol

Water is disinfected by a substance to avoid toxification

Choose an answer

KMnO₄

Alums

O₃

Cl₂

Which substance reacts with sodium nitroprusside.

Choose an answer

Ethanol

Acetaldehyde

Dimethyl ketone

Methanol

Which one of the following does not react with dilute sulphuric acid.

Choose an answer

Mg (OH)2

Mg

MgO

Mg(NO3)2

The macro nutrients are required in ranging from

Choose an answer

5 kg to 200 kg

5 kg to 200 g

6g to 200 g

1 kg to 100 kg

Which compound is the most reactive

Choose an answer

Benzene

Ethene

Ethane

Ethyne

Methyl alcohol can be represented by all of the following words or symbols except.

Choose an answer

CH3OH

Wood spirit

Methanol

Grain alcohol

Which one of the following is not use of chlorine.

Choose an answer

Formation PVC

Formation of mustard gas

Disinfectant and bleaching agent

Formation of sodium chloride

Boric acid cannot be used

Choose an answer

As antiseptic in medicine

For washing eyes

In soda bottles

For Enamals and Glazes

Wohler synthesized first organic compound in laboratory from

Choose an answer

Heating cyanogen's

Cyanogen and ammonium chloride solution

Cyanogen and HNO2

Heating ammonium cyanate