Question # 1

Water pollution is mainly due to

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Sulphure dioxide

Carbon dioxide

Oxygen

Industrial discharges

The hydration energy is the heat evolved when one mole of gaseous ion is dissolved in water. The hydration energy of an ion

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Increases with increase of charge to mass ratio

Decreases with increase of charge to mass ratio

Depends on sign of charge +ve or -ve

Depends upon the solvent

The example of a photo chemical reaction is photosynthesis has order of reaction :

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1

2

0

3

Which gasses are produced from landfills

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NH₃

H₂S

N₂

All of these

Fe can displace Cu form CuSO4solution because

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Fe is ferromagnetic

Fe is below Cu in electrochemical series

Fe is above Cu in electrochemical series

Fe exists in divalent oxidation state

Halogens on treating with silver salts of acids give

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Alcohol

Ester

Phenol

Alkyl halide

Antibonding MO is formed by

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Addition of atomic orbitals

Substraction of atomic orbitals

Multiplication of atomic orbitals

None of these

Sterols, vitamin D and terpenese belong to

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Simple lipids

Complex lipids

Derived lipids

None

In a period, melting points of elements

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Increases

Decreases

Remain constant

First increases then decreases

Pure water does not conduct electricity because it

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Has low boiling point

Is almost unionized

Is neutral

Is readily decomposed

Which of the following elements is most metallic?

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P

As

Sb

Bi

A nuclophile must

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Be an atom

A group of atoms

Have a lone pair

Be negatively charged

A polymer may be

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Linear

Branched

Cross linked

All of these

Which one of the following substances is used to decolourizing agent

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Abestos

Animal charcoal

conc. H2SO4

Silica gel

For which one of the following pairs of compounds can the members be distinguished by means of Tollen's test

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HCHO and CH₃CHO

CH₃CHO and CH₃COCH

CH₃COCH₃and C₆H₅COCH₃

CH₃COOH and CH₃COOCH₃

Which is not true about acetophenone?

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Reacts to form 2,4-dintrophenyl hydrazine

Reacts with Tollen's reagent to form silver mirror

Reacts with I₂/NaOH to form iodoform

On oxidation with alkaline KMnO₄followed by hydrolysis gives benzoic acid

Which of the following compound is obtained on passing ethanol vapours on heated Al₂O₃?

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Ethylether

Acetone

Ethane

Ethanol

K_bfor NH₄OH is 1.81 x 10^-5, then K_avalue of its conjugate base is

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1.81 x 10⁺⁵

1.81 x 10^-9

5.5 x 10^-9

5.5 x 10^-10

B.O.D is connected with

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Organic matter

Microbes

Mircrobes and organic matter

None of the above

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

Which statement about Arrhenius equation is incorrect

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Factor 'A' called Arrhenius constant depends upon collision frequency of reactants

Rate of reaction increase by increasing temperature

Rate constant k is increased

Activation energy Ea is decreased by rise in temperature

Which of the following compounds is explosive in nature?

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Phosphorus trichloride

Nitrogen trichloride

Hyponitrous acid

Nitrosyl chloride

The substance which contains the water of crystallization is called

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Hydrated

Solvated

Crystal

None

When cathode rays strike the anode metal X-rays are emitted and not the positive rays because

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Cathode rays are material particles

Cathode rays knock out electrons from anode, which emit X-rays when outer electron take their place

Cathode rays are absorbed by the nucleus

Cathode rays become heated

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Br_2(aq)

2, 4-dinitrophenylhydrazine

NaBH

Tollen's reagent

Choose the correct answer of transition elements?

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Transition elements have low melting points

Transition elements do not have catalytic activity

Transition elements exhibit variable oxidation states

Transition elements exhibit inert pair effect

Maximum hydrogen bonds in water are

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4

3

2

8

AgCl is soluble is

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Aqua regia

H₂SO₄

HCl

NH₃

Which of the following elements is not present in all proteins?

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Carbon

Hydrogen

Nitrogen

Sulphur

Hydrocarbans, SO₂, CO, NH₃, nitrogen oxides and compounds of fluorine are called

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Primary pollutant

Secondary pollutant

Tertiary pollutant

None of these

Which technique is used to determine the absorption of radiations?

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Dilatometer method

Optical rotation method

Spectrometry

Refractometric method

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