Question # 1

In sp²hybridization bond angle is _____

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120°

180°

109.5°

None

A single chlorine free radical can destroy how many ozone molecules

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100

100000

10000

10

A common industrial solvent is a mixture of propanone; CH₃COCH₃, and pentyl ethanoate CH₃CO₂(CH₂)₄CH₃. Which reagent would have no effect on this solvent

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Na_(s)

NaBH₄

NaOH_(aq)

2,4-dinitrophenylhydrazine reagent

The correct set of quantum numbers (n,l and m) respectively of the unpaired electron of chlorine atom is

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2,1,0

2,1,1

3,1,1

3,2,1

Synthesis of rubber is made by polymerization of

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Chloroform

Acetylene

Divinylacetylene

Butene

Which of the following is a typical transition metal?

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Sc

Y

Ra

Co

Paraffins are also called

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Alkanes

Alkynes

Alkenes

None of these

A pseudo uni-molecular reaction has order of reaction :

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3

2

1

0

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Le-chatlier's principle

Only adding catalyst

Decreasing pressure

Decreasing temperature

The element which has a simple cubic lattice in solid state is

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Se

Te

Po

None of these

The unit of specific conductivity is

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Ohm cm^-1

Ohm cm^-2

Ohm^-1cm

Ohm^-1cm^-1

According to Lewis concept ethers behave as:

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Acid

Base

Acid as well as a base

None of them

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

Rutherford's planetary like picture of the atomic modal was defective because

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It did not describe the quantity of positive charge

It did not explain the repulsion of protons within the nucleus

No empty space between nucleus and the electrons

Moving electron should radiate energy

Ethanal may be converted into a three-carbon acid in a two-step process.

Which compound is the intermediate

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CH₃CO₂H

CH₃CN

CH₃CH₂CN

CH₃CH(OH)CN

Which reaction is too vigorous to control

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Chlorination

Bromination

Iodination

Fluorination

The heat contents of all the elements in their standard states are taken to be

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1

2

0

None

Which of the following is not a sub-atomic particle

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Electron

Proton

Neutron

Deuteron

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

The total number of possible values of magnetic quantum number for the value of l=3 is

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3

1

5

7

The polymers which can not be re-softened again and again are called

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Thermoplastic

Thermosetting

Both a and b

None

Acetic anhydride is obtained form acetyl chloride by the reaction of

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P₂O₅

H₂SO₄

CH₃COONa

CH₃COCH₃

Which one of the following does not belong to alkaline earth metals

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Be

Ra

Ba

Rn

Toluene can be oxidized to benzoic acid by

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KMnO₄(alk)

K₂Cr₂O₇(acidic)

Both

None

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0.5

4.0

2.5

0.25

Which of the following has the maximum number of unpaired d-electrons?

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Zn

Fe²⁺

Ni³⁺

Cu⁺

To purify water which has mud dissolved in it, A substance which coagulates the suspended particles is used. The coagulant may be

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Ag⁺

Cu²⁺

Al³⁺

Si⁴⁺

The equivalent weight of KMnO₄(formula weight = M) when it is used as an oxidant in neutral medium is

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M

M/2

M/3

M/5

Alkenes combine readily with electrophillic reagents such as halogens giving

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Haloalkanes

Gem-dihalides

Vicinal dihalides

Vinyl halides

Source of organic compounds primarily is:

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Plants

Animals

Minerals

A & B

The relative lowering of vapour pressure is equal to the mole fraction of the solute, This law is called

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Henry's law

Raoult's law

Ostwald's law

Arrhenius law

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