Question # 1

Which one of the following reacts immediately with conc. HCI in the presence of ZnCI₂

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Primary alcohol

Secondary alcohol

Tertiary alcohol

Ether

The major reaction occurring in the engines of automobiles is

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Oxidation

Reducing

Combustion

Decomposition

Meta directing group decreased the ----------- of benzene ring

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Physical activity

Chemical reactivity

Density

None

The energy required to break one mole of bonds to form neutral atoms is called

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Bond length

Bond strength

Bond energy

None of these

A carbon atom carrying a postitive charge and attached to three other atoms of groups is called

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Caronium ion

Carbanion

Oconium ion

Carba ion

The colour of transition metal complexes is due to

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d-d transitions of electrons

Para magnetic nature of transition elements

Ionization

Loss of s-electrons

Among O, C, F, Cl, Br, the correct order of increasing radii is

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F O C Cl Br

F C O Cl Br

F Cl Br O C

C O F Cl Br

A reaction in which heat is given out is

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An endothermic reaction

An exothermic reaction

A thermochemical reaction

An energetic reaction

Which of the following species participate in sulphonation of benzene ring?

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H2SO4

HSO4

SO3

SO^-₂

Selection of filter paper depends upon sizes of particles to be:

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Tested

^Filtered

Checked

All of above

Which reagent will distinguish a ketone from an aldehyde

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Br₂

2, 4-dinitrophenylhydrazine

NaBH₄

Tollen's reagent

Two or more similar monomers combine to form:

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Homopolymer

Copolymer

Ter polymer

Thermoplastic polymers

Which one of the following will have the maximum dipole moment

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CH₃F

CH₃Cl

CH₃Br

CH₃l

The total number of transition elements is:

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10

14

40

50

Hydrocarbons are divided into aliphatic, alicyclic and aromatic which structure among the following show an alicyclic hydrocarbon

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Aldehyde and small methyl ketones form crystalline ______ ppts with saturated sodium bisulphate solution

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White

Red

Yellow

None of these

If liquids A and B form an ideal solution

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The enthalpy of mixing is zero

The entropy of mixing is zero

The free energy of mixing is zero

The free energy as well as the entropy of mixing are each zero

Nylon 6, 6 is prepared by the reaction of nexamethylene with

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Formic acid

Acetic acid

Adipic acid

None of these

Which one of the following reagents will distinguish between C₆H₅CHO and C₆H₅COCH₃

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Aqueous bromine

Phosphorus pentachloride

2, 4 DNPH

Tollen's reagent

Elements combine together due to inherent tendency to stabilize themselves by:

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Losing electron.

Sharing electrons.

Gain in electrons.

All of above.

Maximum potential energy that an electron can have within the atom is:

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Equal to zero.

Less than zero.

Greater than zero.

Infinite

The boiling point of heavy water is

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108°C

101.4°C

99°C

110°C

Phosphorus helps the growth of

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Root

Leave

Stem

Seed

Macromolecules are

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organic molecules

High molecular mass molecules

Natural compounds

Rarely occurring molecules

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

The structure of benzene is

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Hexagonal

Pyramidal

Square planer

Tetrahedral

When acetamide is hydrolysed by boiling with acid the product obtained is

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Ethyl amine

Ethyl alcohol

Acetic acid

Acetaldehyde

In which one of the following compound rings are not fused together at ortho positions

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Phenanthrene

Naphthalene

Diphenyemethane

Anthracene

A single chlorine free radical can destroy how many ozone molecules

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100

100000

10000

10

When the rate of reaction is entirely independent of the conc. of reaction molecules then order of reaction is

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Zero

First

Second

Third

Metallic conduction is due to the

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Movement of electrons

Movement of ions

Both a and b

None of these

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