Question # 1

Gypsum is a common mineral of

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Magnesium

Strontium

Calcium

Barium

Rusting can be avoided by :

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Making alloys

Tin or Zinc plating

Use of enamel

All of these

During dehydration of alcohols to alkenes by heating with conc. H₂SO₄, the initial step is

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Formation of an ester

Protonation of alcohol molecule

Formation of carbocation

Elimination of water

The arrangement of subshells in the ascending order of their energy on complete filing of 4f subshell the entering electrons goes to

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5s

5p

5d

5f

Surfactants are organic compounds, used in detergents which reduce the

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Viscosity of water

Surface tension of water

Boiling point of water

Wetting ability of water

Which is not the condition for the formation of smog

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There must be sufficient NO gas

There must be sunlight to help photo chemical reaction to take place

Air must be blowing swiftly

There must be SO₂in the air

The geometry of 4 sp³hybrid orbitals on an atom is

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Square planar

Tetrahedral

Trigonal planar

Linear

The reaction-method that does not give an alkane is

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Catalytic hydrogenation of alkanes

Wurtz reaction

Hydrolysis of alkyl magnesium bromide

Dehydrohalogenation of an alkyl halide

Coal is used to bake bricks in lime kiln:

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40%

60%

80%

None of these

C- X bond is strong in

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CH₃Cl

CH₃Br

CH₃F

CH₃I

denaturing of alcohol is done by adding methanol in ethanol:

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10%

20%

30%

40%

Aromatic aldehydes undergo disproportionation in presence of sodium or potassium hydroxide to give corresponding alcohol and acid. The reaction is known as

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Wurtz reaction

Cannizzaro reaction

Friedel Craft reaction

Claisen reaction

Propanone is the product obtained by dehydrogenation of

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2-Propanol

1-Propanol

Isobutyl alcohol

Propanethoil

n + l value for 4f will

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2

5

7

9

Which statement is not correct

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Enzymes catalyst a specific reaction

Enzymes show catalytic activity at a specific temperature

The catalytic activity of enzymes is stopped if optimum pH is changed

The catalytic activity is poisoned by a co-enzymes

The number of bonds in nitrogen molecule is

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Oneφ and one π

Oneφ and two π

three sigma only

Two φ and one π

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Condensation

Dehydration

Dehydrogenation

Hydrogenation

Chromium (VI) is highly toxic and can cause

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Blindness

Cancer

Liver problems

Blood problems

In a reversible reaction, two substances are in equilibrium. If the concentration of each one is reduced to half, the equilibrium constant will be

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Reduced to half of its original value

Doubled

Same

Reduced to one fourth its original value

How many g of dibasic acid (mol. wt. 200) should be present in 100 ml of the aqueous solution to give 0.1 Normality?

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1 g

2 g

10 g

20 g

What is the maximum mass of aluminium which can be obtained from 240g of aluminium oxide Al₂O₃?

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26 g

127 g

51 g

108 g

Soil remediation means

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To make it suitable for cultivation of crops

To make it acidic

To make it alkeline

To add manure into it

N₂O₄⇌ 2NO₂

For the above reaction, which of the Following expression of K_c correct :

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Kc = [ N₂O₄]/[ NO₂]²

Kc = [ N₂O₄]/ [NO₂]

Kc = [ N₂O]²/[ N₂O₄]

Kc = [ N₂O₄]/[ N O₂]

Which of the following will have the highest boiling point at 1 atm pressure?

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0.1 M NaCl

0.1 M Sucrose

0.1 M BaCl₂

0.1 M Glucose

Which is in differnet phase form other metals

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Ni

Hg

Cd

Na

Treatment of a secondary alcohol with a suitable oxidizing agent (K₂Cr₂O₇) results in the formation of

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Ketone

Aidehyde

Ether

Alkyl halide

The addition of unsymmetrical reagent to unsymmetrical alkene is in accordance with the rule:

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Hund's rule

Markownikov's rule

Pauli's Exclusion Principle

Auf bau Principle

Gasoline is a mixture of hydrocarbons containing carbon atoms

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5 to 10

5 to 8

5 to 12

5 to 11

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Zero

253 sec

150 sec

500 sec

In a Galvanic cell, the electrons flow from

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A node to cathode through the solution

Cathode to anode through the external circuit

Anode to cathode through the external circuit

An alkynes having Carbon count of 20 is

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gas

liquid

Solid

None

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