Question # 1

The colour of hydrated cobalt(II) chloride solid is

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White

Black

Blue

Pink

The unit of ionization energy is

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nm and pm

kJ mol-1

Pascal

Newton

Which types of attractive forces are presentin ionic compounds.

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Covalent bonds

Electrostatic forces of attraction

Mtallic bonds

Coordinate covalent bonds

Example of heterogeneious mixture is

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Soil

Gasoline

AIR

Ice Cream

All the elements of Group II A are less reactive than alkali metals. This is because these elements have.

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Decreased nuclear charge

Similar electronci configuration

High ionization energies

Relatively greatr atomic size.

Activation energy of a chemical reaction must be....... the everage kinetic energy of reacting molecules.

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Equal to

Grether than

Lower than

None of these

N-shell contains number of subshells.

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1

3

4

2

Which one of the following is heterogeneious mixture.

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Milk

Ink

Sugar solution

Milk of magnesia

Triple covalent bond involves how many electrons.

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Six

Four

Eight

Three

Metals lose their elecrons easily because.

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They are elecrnegativity

They have electron affinity

They are electropositive

Good conductors of heat

What is the mass of AI in 204 g of aluminium oxide Al₂O₃

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26 g

54 g

108 g

27 g

For which reaction Kf is the rate constant?

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Forward reaction

Backward reaction

Upward reaction

Downward reaction

Maltose is commonly found in .

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Cereal

Milk

Cotton

Honey

Soda time is a mixture of:

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CaO and NaOH

CaCI2 and NaOH

CaO and ca(OH)2

CaCI2 and KOH

Catalyst used in Haber's process is:

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Ni

Fe

Cu

Zn

Chloroform is used for

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Anesthesia

Fever

Link

Toys

Coal tar contains compounds

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Benzene

Phenol

Toluene

All

Blast furnace usually used for the metallurgy of.

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Iron

Copper

Aluminum

Both a and b

The percentage of water in human body is about:

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60%

50%

70%

80%

All water soluble metallic oxides have characteristic of:

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acidic

basic

neutral

amphoteric

Cholera is caused by

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Protozoa

Virus

Bacteria

Fungi

Which one the following is more reactive?

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Methane

Ethane

Ethene

Acetylene

Bromine has isotopes

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2

4

8

6

the volume occupied by 1.4 of N2 at S.T.P is

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2.24 dm3

22.4 dm3

1.12 dm3

112 cm3

In which of the following Paris, do the elements form a compound by sharing electrons.

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carbon and chlorine

Lithium and iodine

Neon and oxygen

Potassium ad bromine

Some impurities of MgCl2 are present in NaCl which separation technique can be used to separate the impurities.

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Filtration

Crystallization

Common ion effect

Chromatography

Whenever a reaction is endothermic, then it means that

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Heat is transferred from surrounding to the system

Heat is transferred system to the surrounding

Heat content of the product is greater than that of reactants

Heat content of the reactants is greater than the products

The concept of distribution of velocities among the gas molecules was given by.

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Clausius

Mexwell

Boltzmann

Vander waal

Orbitals having same energy are called

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Hybird orbitals

Valence orbitals

Degenerate orbitals

D-orbitals

Positive rays were discovered by.

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J.J.Thomson

Goldstein

Ruther ford

William Crookes

Salt of weak acid with strong base when dissolved in water gives.

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Acidic solution

Basic solution

Neutral solution

None of above

The cathodic reaction in the electrolysis of dil H2SO4, with pt electrode sis.

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Reduction

Oxidation

Both oxidation and reduction

Neither oxidation nor reduction

Which one of the following molecule have angle of 120 ^o

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Be Cl2

BF3

CH4

NH3

The composition of oleum is.

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H2SO4

H2S2O3

H2S2O7

H2S3O7

The nitrogen present in some fertilizers helps plants

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to fight against diseases

to produce fat

to undergo photosynthesis

to produce protien

Which of the following lipids does not have glycerol backbone.

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Fat

Oil

Cholesterol

Phospholipid

The percentage of carbon in different types of iron products is in the order of

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cast iron > wrought iron > steel

wrought iron > steel > cast iron

cast iron > steel > wrought iron

cast iron = steel > wrought iron

What is the function of Head box in paper making machine.

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It reduces the thickness of paper

It dry the paper

It discharge teh pulp at the screen of fourdrinier table

Web structure is consolidated

The reaction between concentrated H2SO4 and glucose give carbon and water. In this reaction H2SO4 acts as.

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An acid

An oxidising agent

Dehydrating agent

A reducing agent

Number of elements in the first period of the periodic table is

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2

8

14

18

Which class of compounds can not show positional isomerism.

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Alkanes

Alkene

Alkynes

Alcohol

Which one is primary pollutant.

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Peroxyacetyl nitrate

Sulphuric acid

Carbonic acid

Carbon monoxide

Which acid is used in the manufacture of synthetic fibre

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Formic acid

Oxalic acid

Carbonic acid

Acetic acid

To prevent corrosion, Iron pipes carrying drinking water are covered with zinc by

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alley formation

Electroplating

Galvanizing

Soldering