Question # 1

The oxidation number of chromium in K₂Cr₂O₇ is:

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+2

+6

+7

+14

1 torr = ?

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1 mm of Hg

1 atm

760 mm of Hg

1 pascal

_________ which occupies space and have mass.

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Matter

Atom

Molecule

All of above

Intermolecular forces are of three types and are collectively called ____________

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Nelson' forces

Vander Waal's forces

Neurons

Nil

Mixture has _________ types.

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3

2

1

No types

Sodium is exterminate reactive metal, but it does not react with:

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Hydrogen

Nitrogen

Sulphur

Phosphorus

Addition of OXYGEN is called.

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Reduction

Conduction

Oxidation

Nil

Potassium's atomic no. is :

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17

18

19

20

Air is an example of:

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Gas in gas

Solid in gas

Liquid in gas

Gas in ;iquid

................. can be decomposed into simpler substanmce.

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Compound

Element

Solution

Mixture

Gases have ____________ shape.

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Fixed

Not Fixed

Nil

Both a & b

High concentration of which metal clogs the fish gills.

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Zinc

Aluminium

Sodium

Copper

Gelatin protein is found in.

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Blood

Skin

Heart

Bones

Which chemical is called king of chemicals?

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KNO₃

H₂SO₄

HCl

NHO₃

Dehydration means removal of.

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Water

Halogen

Hydrogen

All above.

_______ is the king of chemicals.

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Hydrochloric acid

Nitric Acid

Sulphuric acid

Phosphoric acid

Formic acid is present in

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String of bees

Sour milk

Apple

Fats

Fossil fuel means.

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Coal

Petroleum

Natural gas

All of them

Which pollutant is responsible for changing weather?

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Air pollutant

Water pollutant

Soil pollutant

All of them

Which one of the following species is not amphoteric?

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H₂O

NH₃

HCO₃

SO₄

50% dextrose contains approximate amount of energy.

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250 calories

16 Calories

170 calories

120 calories

Basic solution have pH value.

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Less than 7

Greater than 7

equal to 7

None of these

The free expansion of the gas from high pressure towards the low pressure causes

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Increase of temperature

Decrease of temperature

Grater number of collisions among the molecules

Decrease of velocity of gas molecules

The partial pressure of oxygen in lungs is

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760 torr

320 torr

159 torr

116 torr

London dispersion forces are the only forces present among the

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Molecules of water in liquid state

Atoms of helium in gaseous state at high temperature

Molecules of solid iodine

Molecules of hydrogen chloride gas

An aqueous solution of ethanol is water has vaporu pressure.

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Equal to the of water

Equal to that of ethanol

More than that of H2O

Less than that of water

During the process of crystallization, the hot saturated solution.

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Is cooled very slowly to get large sized crystals.

Is cooled at a moderate rate to get medium sized crystals

Is evaporated to get the crystals of the product.

Is mixed with an immiscible liquid to get the pure crystals of the product.

The electrode reaction of a voltaic cell can be reversed when

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Concentrations of solutions are changed

Temperature is increased

Electrodes are interchanged

Electric circuit is employed to supply the source of electricity

Ascorbic acid is vitamin.

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A

B

C

D

The number of moles of acid or base required by one dm³of buffer to alter its pH by one unit is called

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Buffer efficiency

Buffer capacity

Buffer action

None

The molecules of CO₂in dry ice form the

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Ionic crystal

Covalent crystals

Molecular crystals

Any type of crystals

The long chains of amino acids are coiled about one another onto a spiral by

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Ionic bond

Van der walls forces

Hydrogen bonding

Overlapping of orbitals

The law of mass action was given by

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D.C. down and P wage

Gay Lussic and C.M

C.M Goldberg and P. Waage

Hendeson and Le Chateller's

Which of the following is a typical transition metal

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Sc

Y

Ra

Co

Which of these polymers is a synthetic polymer

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Animal fat

Starch

Cellulose

Polyester

Which noble gas is used in radiotherapy

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Neon

Argon

Krypta

Radon

Peroxyacetyl nitrate is an irritant to humab beings and it affects

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Eyes

Ears

Stomach

Nose

Secondary alkyl halides are those in which halogen atom is attached with a carbon atom which is further attached to.

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One beta carbon

Two beta carbon

Three beta carbon

Four beta carbon

A solution of borax in water is.

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Acidic

Alkaline

Neutral

None of these

In Pakistan, the total consumption of paper per person per year is.

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2 kg

5 kg

7 kg

10 kg

Water will be considered polluted if it has dissolved oxygen.

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3ppm

4ppm

5ppm

6 ppm

Which one of the following set of raw material is most suitable for manufacture of urea.

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CH4, N2 and CO2

H2, N2 and CO

H2,CO2 and H2O

H2O, N2 and H2

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

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CH3OH

Wood spirit

Methanol

Grain alcohol

Which one of the following gases is used welding purpose usualy.

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Methane

Ethane

Ethene

Acetylene