Question # 1

Oxygen is ___________

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Metals

Non-metals

Gas

b & c

The transition temperature of sulphur is:

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96 °C

250 °C

18 °C

218 °C

Carbon exists in ________________ allotropic forms.

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1

2

3

4

Which one of the following is heterogeneous mixture?

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milk

ink

milk of magnesia

sugar solution

The number of isotopes of carbon are

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1

2

3

5

Cathode rays are actually

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Electrons

Protons

Neutrons

Photons

"×" & "." Represent:

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Shells

Neutrons

Electrons

Atoms

Which one of the following halogen has lowest electronegative?

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fluorine

chlorine

bromine

iodine

Pure alkali metals can be cut simply by knife but iron cannot because of alkali metals have:

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Strong metallic bonding.

Weak metallic bonding

Non- metallic bonding

Moderate metallic bonding

____________ Is drawn in wires.

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Gold

Silver

Helium

Nil

The bond in the product of lewis acid base reaction.

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Ionic

Covalent

Metallic

Coordinate covalent

Which is the essential sugar found in milk?

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Maltose

Lactose

Galactose

Starch

The % age of carbon in peat is :

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60%

70%

80%

90%

Which one of the following is not a fraction of petroleum?

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Kerosene oil

Diesel oil

Alcohol

Petrol

Which one of the properties of water is responsible for rising of water plants?.

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Specific heat capacity

Surface tension

Excellent solvent action

Capillary action.

Which one of the following statements about glucose and sucrose is incorrect.

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Soluble in water

Naturally occuring.

Carbohydrates

Disaccharides

The coal in which the percentage of carbon is 60%

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Peat

Lignite

Bituminous

Anthracit

Alkanes are also called:

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olefins

Paraffins

aliphatic compound

cyclic compounds

When copper pyrite (CuFeS2) is strongly heated in excess of airit converted into mixture of:

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Cu2S + Cu2O

Cu2O +FeS

Cu2S + FeS

FeO + SO2 + Cu2S

At equilibrium state, when reaction cases to proceed, it is called:

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equilibrium constant

dynamic equilibrium

static equilibrium

simple equilibrium

Which one of the following expressions is for ideal gas equation.

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PM= nRT

PV = nRT

PV = dRT

PV= nTP

Gases exert pressure on the walls of the container becasue the gas molecules.

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Collide with each other

Collide with walls of container

Have definite volume

Obey the gas laws

Conduction of electricity through gases under reduced pressure is due to the transportation of.

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positive charge

Negative charge

Both types of charges

None of these

The pH of 10^-3mol dm^-3of an aqueous solution of H₂SO₄is

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3.0

2.7

2.0

1.5

The rate of reaction

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Increases

Decreases

Remains the same

May decrease of increase

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dm⁺⁶mole^-2

mole²dm^-6

Mole dm^-3

Having no units

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

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It is saturated

It shows positive deviation from Raoult's law

It shows negative deviation from Raoult's law

It is metastable

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

Azeotropic mixture

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Obey Raoult's law

Do not obey Raoult's law

Boils at low temperature only

Boils at high temperature only

Which mixture of gases is used by the deep sea divers.

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Oxygen and nitrogen

Oxygen and helium

Oxygen and carbon di oxide

Oxygen and water vapours

Which one is alcohol in the following

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CH₃.CH₂.OH

CH₃.O.CH₃

CH₃COOH

CH₃.CH₂.Br

The pH of truly acidic rain is

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7-6.8

6.5-6

6-5.6

less than 5

In which group of periodic table is the element which has atomic number 14.

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II

IV

III

VI

Which condition are not suitable for the growth of enzymes.

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Temperature between 25 ^oC to 37 ^oC

Solution must be dilute

Environment must be aerated

Some preservative should be present in solution

SN2 reactions can be best carried out with

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Primary alkyl halides

Secondary alkyl halides

Tertiary alkyl halides

All the three

Phosphorous helps the growth of

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root

leave

stem

seed

Which compound is more soluble of water

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C2H5OH

C6H5OH

CH3OCH3

n- Hexanol

In which ore carbon is present

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Magnesite

Epsom salt

Barite

Sylvite

Micro-nutrient is required in quantity for plant growth ranging from

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4-40 gm

6-200 gm

6-200 kg

4-40 kg

What is Glacial acetic acid

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Pure acetic acid

95% acetic acid

a mixture of acetic acid and glycerol

Vinegar