Question # 1

Which has metallic bond?

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H

Na

HCI

P

Gases are the lightest form of mater and their densities are expressed in terms of:

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mg cm^-3

g cm^-3

g dm^-3

kg dm^-3

H° - H° has ________________ energy.

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Lower

Higher

Medium

Nil

Which one of the following is liquid in solid solution?

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sugar in water

butter

opal

fog

Metals are ________________

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Liquid

Solid

Gas

Malleable

How many number of electrons take part in triple covalent bond?

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2

4

6

8

The mass of one molecule of water is:

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18 amu

18g

18mg

18kg

Every system in the universe tends to lower its energy to attain ________________

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Freedom

Flow

Stability

Nil

________________ elements were discovered in year 1800.

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34

35

36

37

All are noble metals except:

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Silver

Gold

Hydrogen

Platinum

First energy level is denoted by:

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K

L

M

N

A pollutant is a waste material that pollutes.

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Air

Water

Soil

All of them

According to Bronsted and Lowry concept an acid is a substance that can donate.

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Proton

Electron pair

Neutron

Electron

Which factor determines the severity of a pollutant?

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Chemical nature

concentration

Persistence

All of them

Temporary hardness is removed by adding.

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Quick lime

Slaked lime

Lime stone

Lime water.

Functional group of Alcohols is

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-COOH

-C=0

C-O-C

-OH

Permanent hardness is removed by adding.

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Na₂ zeolite.

Soda lime

Lime water

Quick lime

The coal in which the percentage of carbon is 60%

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Peat

Lignite

Bituminous

Anthracit

When the rate of a the forward reaction takes place at the rate of reverse reaction the composition of the reaction mixture remains constant it is called.

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Chemical equilibrium

Dynamic equilibrium

Static equilibrium

All

When a system is at equilibrium states?

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The concentration of reactants and products becomes equal

The opposing reactions

The rate of the reverse reaction becomes very low

The rates of the forward and reverse reactions becomes equal.

Depending upon temperature variation, atmosphere ins divided into how many regions?

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1

2

3

4

Plants produces by the photosynthesis process.

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Glucose

Fructose

Sucrose

Maltose

Which one of the following substances is not sublime material.

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Iodine

Benzoic acid

Ammonium chloride

Potash alum

The deviation of a gas from ideal behavior is maximum at.

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-10 ^oC and 5.0 atm

-10^oC and 2 atm

0^oC and 2 atm

100^oC and 2 atm

In a solution 7.8 g of benzene and 46 g of toluene is present The mole fraction of benzene is.

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1/2

1/3

1/5

1/6

Repeated extraction using small portions of solvent are more.

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Accurate

efficient

Slow

Rapid

In endothermic reactions, the heat content of the

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Products is more then that of reactants

Reactants is more than that of products

Both a and b

Reactant and products is equal

The total kinetic energy of one mole of an ideal gas is given by

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3/2 RT

1/2 KT

1/2 RT

3/2 KT

Standard enthalpy change when one mole of compound is formed from their elements at standard state is.

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Heat of formation

Standard heat of formation

Heat of combustion

Standard Heat of neutralization

Ionic compound do nto show the phenomenon of Isomerism because bond are.

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Directional and rigid

Non directional and rigid

Non directional and non rigid

All above

A pressure cooker reduces cooking time because.

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Heat is uniformly distributed

Boiling point of water rises

A large flame is used

Vapour pressure of liquid reduces

Which of the following will have the same number of molecules at STP

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280 cm³of CO₂and 280 cm³of N₂O

11.2 dm³of O₂and 32 g of O₂

44 g of CO₂and 11.2 dm³of CO

28 g of N₂and 5.6 dm³of oxygen

When a non-spontaneous redox reaction is carried out by using the electrical current, then the process is called

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Decomposition of the substances

Cracking

Hydrolysis

Electroiysis

Which one of the following compounds is a heterocyclic.

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Anthracene

Phenol

Pyridine

Aniline

Disinfection of water by chlorine is done by the production of.

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NH2Cl

NCl2

HOCl

NHCl2

In aqua regia, the ratio of conc. HCl to Conc. HNO3 is

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1 : 1

2 :1

1:2

3 : 1

Which one of the following is calcareous material

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Marine shells

clay

Shale

Blast furnace slag

The solution of which acid is used for seasoning of food

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Benzoic acid

Butanoic acid

Formic acid

Acetic acid

Prilling is a process in which

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Concentration of urea is increased

Water is removed from urea

Molten urea is converted to solid drop

Some other ingredients are added to urea

When carbon di oxide is bubbled through lime water, white precipitate is formed This precipitate is.

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COCl2

H2CO3

CaO

CaCO3

The region of earth capable of supposing life is called.

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Atmosphere

Bisphere

Dithosphere

Hydrosphere

Alkyl halides are considered to be very reactive compounds towards nucleophile because

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They have an electrophilic carbon

They have an electrophilic carbon and a good leaving group

They have an electrophilic carbon and a bed leaving group

They have a nucleophilic carbon and a good leaving group

The total number of translation elements is

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10

14

40

65

When Cu reacts with conc. HNO3 , which one of the following gases is evolved

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N2O

NO

NO2

N2O5