Question # 1

Which molecules is donor in nature?

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H₂

NH₃

O₂

HF

O3, Ozone is _________ molecules.

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Homoatomic

Hetroatomic

Monoatomic

Nil

Hydrogen is a ____________

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Metal

Non metal

Metalloids

Nil

The escape of gaseous molecules one by one is called ____________.

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Diffusion

Effusion

A & b

Nil

Which of the following does not affect solubility?

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Temperature

Pressure

Nature OF SOLVENT

Area

Br2 + H2S __ 2HBr + S, which one is oxidizing agent:

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H2S

Br2

S

2HBr

The bond in covalent compound is ________________

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Covalent

Ionic

Dative

Couple

Mobility is property of ____________

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Liquid

Gases

A & b

Nil

The reverse of evaporation is:

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Boiling

Diffusion

Condensation

Freezing

biology bis classified as ___________ science.

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Engineering

Physical

Natural

Chemical

Metals from a ____________ part of earth on which we live.

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Smaller

Larger

Medium

Nil

Which is used for cleaning agent for domestic and commercial purpose?

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NaCl

Na₂CO₃

NaHCO₃

Na₂SiO₃

Normal rain water is:

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weakly acidic

strongly acidic

weakly basic

strongly basic

___________ is not green house effect.

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Increase of food chain

increase atmospheric pressure

Increase of sea level

Increase of flood risks

Which one gas is liberated when alkalies react with ammonium salts?

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O₂

CO₂

H₂

NH3

Which protect our muscles from cramping?

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Carbohydrats

Vitamins

Lipids

Proteins

Equilibrium constant value "K" is equal to:

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Kt / Kr

Ki / Kr

Kc / Qc

Qc /Kc

How many percent of natural gas is consisted of methane.

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60%

70%

80%

85%

Which one is not a characteristic of an acid:

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it turns red litmus blue

it reacts with base to form salt and water

Its aqueous solution conduct electric current

it has sour taste

The order or reactivity of hydrogen halides with alkenes is.

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HI/Br

HBr > HI

HCl > HBr

HBr>HCl

Which one of the following salts makes the water permanent hard.

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NaCO₃

NaHCO₃

Ca(HCO₃)₂

CaSO₄

Which salt cause permanent hardness in water is:

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Ca(HCO₃)₂

Mg(HCO₃)₂

CaCl₂

KCl

Which of the following elements in its crystalline form will have the lowest enthalpy change of vaporization

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Chlorine

Argon

Phosphorus

Silicon

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

Conductivity of metal decreases by increasing temperature because.

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Atoms are converted to ions

Atoms oscillates and hinder the movement of free electrons.

Ions are converted into atoms

Velocity of mobile electrons increases

Which substance have delta E = Delta H and no pressure - volume work.

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Liquids only

Solids only

Gases only

Liquids and solids

Depression in the F.P is directly proportional to

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Molarity of solution

Molarity of solvent

Molality of solvent

Molality of solution

Which gas has highest e/m ratio

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Hydrogen

Helium

Nitrogen

Oxygen

Weak intermolecular forces are present in.

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Only gases

Only liquid

Only solids

gases, liquids and solids

An aqueous solution of ethanol in water has vapour pressure

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Equal to that water

Equal to that of ethanol

More than that of H₂O

less than that of water

The change in heat energy of a chemical reaction at constant temperature and pressure is called.

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Enthalpy change

Bond energy

Heat of sublimation

Internal energy change

The pK_avalue of CH₃COOH is 4.74 when we mix CH₃COOH and CH₃COONa in the ratio of 10:1, tehn the pH of the buffer is

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4.74

5.74

3.74

7.00

Which of the following statement is contrary to the first law of thermodynamics

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An equivalent amount of heart energy can neither be created nor destroyed

One form of energy can be transferred into an equivalent amount of other kinds of energy

In an adiabatic process, the work done is independent of its path

Continuous production of mechanical work without supplying an equivalent is amount of heat possible

Which products is not formed when ethyl alcohol reacts with SOCl2 in the presence of pyridine.

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Ethyl chloride

Hydrogen chloride

Sulphur di oxide

Sulphur tri oxide

The degree of unsaturation of fat is measured by

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Iodine number

Oxidation number

Reduction number

Saponification value

In purification of potable water the coagulant used is

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Nickel sulphate

Copper sulphate

Barium sulphate

Alum

The general formula for Alkene having one double bond is

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C_nH_2n+1

C_nH_2n

C_nH_2n-2

C_nH_2n+2

Geometrical shape of [CO(NH3)6Cl3

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linear

square planar

Octahedral

Trigonal hypyramid

Refrigeration capacity of liquid neon is greater than liquid helium by

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80 times

50 times

40 times

10 times

Vinyl acetlylene reach with HCl to form

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Polycetylene

Benzene

Chloroprene

Divinylacetylene

Which of the following is not an amino acid

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Aspartic acid

Lysin

Alanine

Aniline

The reaction between Cu and conc. H2SO4 produces

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SO3

SO2

H2

Cu + ions

Which isomerism is not found in alkenes.

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Chain isomerism

Positional isomerism

Geometrical isomerism

Metamerism

Which one of the following gases is prepared by heating a mixture of sodium acetate and sodium hydrozide.

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CH4

CH2-CH3

CO2

CO