Question # 1

The empirical formula of a compound is CH₂O. What may be the compound

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C₂H₅OH

C₆H₅OH

HCOOH

Catalytic oxidation of alkanes is used for the preparation of

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Adehydes

Fatty acid

Carbonyylic acids

Ketones

Which of the following solutions has the highest boiling point ?

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5.85% solution of sodium chloride.

18.0% solution of glucose.

6.0% solution of urea.

All have same boiling points.

Mark the correct statement

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Na⁺is smaller than Na atom

Na⁺is larger than Na atom

Cl^-is the smaller than Cl atom

Cl^-(ion) and Cl (atom) are equal in size

Which of the following is a transition element

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Sr

Sn

Cr

Pb

In the electronic configuration of Cr one electron from 4s sub-shell is transfered to 3d sub-shell because

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The 3rd orbital is of lower energy than 4s

The 4s orbital is of equal energy to 3d orbital

The half filled d-subshell is more stable than incomplete d-sub shell

6 unpaired electrons make Cr more paramagnetic

The ionic product of H⁺ions and OH^-in water is called ionization constant of water Kw. The value of Kw at 25°C is

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0.11 x 10^-14

0.30 x 10^-14

1.0 x 10^-14

3 x 10^-14

Product of concentration of ions raised to the power equal to the co-efficient of ions in balanced equation for saturated solution of a salt is called

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Ionic product

Equilibrium constant K_c

K_w

Solubility product (K_sp)

The oxidation number of Ni in [Ni(CO)₄] is

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+1

0

+4

-4

The self linking property of carbon is called as

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Linking polymerization

Addition

Catenation

Elimination

Carboxylic acids are more acidic than pehnol and alcohol because of

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Intermolecular hydrogen bonding

Formation of dimmers

Highly acidic hydrogen

Resonance stabilization of their conjugate base

If 5.85 of NaCI are dissolved in 90g of water the mole fraction of NaCI is

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0.1

0.01

0.2

0.0196

The natural fertilizers consist of

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Plants

Animals

Both plants and animals

Microorganisms

In preparation medhod of carboxylic acids from alkyl halides always carboxylic acid formed which have carbon atoms:

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One less than in R----X

One more than in R---X

Equal to R---X

Double to R----X

Which of the following is the hardest metal among following

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Li

Na

Rb

K

A fibre which is made from acrylonitrile as monomer

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PVC

Rayon fibre

Acrylic fibre

Polyester fibre

According to the SI-system heat contents are measured in units of

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Calorie

Joules

Ergs

Watts

In a Galvanic cell

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Chemical energy is converted into electricity

Chemical energy is converted into heat

Electrical energy is converted into heat

Electrical energy is converted into chemical energy

The amount of energy required to remove an electron from an atom of an element in the gaseous state is called

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Electron affinity

Electronegatively

Ionization energy

None of these

Hydrolysis of Grignard's reagent gives:

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Alkane

Alkyl

Halide

Alcohol

Which of the following has greatest tendency to lose electron?

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F

Fr

S

Be

Ethyl alcohol is industrially prepared from ethylene by

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permanganate oxidation

Catalytic reduction

Absorbing in H₂SO₄followed by hydrolysis

Fermentation

Which of the following expressions show a heterolytic bond fission

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The sp²hybird orbitals are oriented in space at one angle

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180°

109.5°

100°

120°

In which of these processes are smell organic molecules made into macromolecules?

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The cracking of petroleum fractions

The fractional distillation of crude oil

The polymerization of ethane

The hydrolysis of proteins

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+712 KJ mol^-1

+492 KJ mol^-1

-932 KJ mol^-1

-960 KJ mol^-1

An artificial smell of banana is produced in many articles y using esters which of the following is that

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Amyl acetate

Isoamyl valerate

Octyl acetate

Methyl butyrate

The limiting line of Blamer series in hydrogen spectrum lies in

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Visible regions

Ultraviolet region

Infrared region

x-rays region

Which of the following has unchanged valency?

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H

Na

Fe

Oxygen

Which compound is more soluble in water

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C₂H₅OH

Benzene

CH₃OCH₃

Hexane

Rusting can be avoided by :

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Making alloys

Tin or Zinc plating

Use of enamel

All of these

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