Question # 1

If allowed to expand, the gases suddenly

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heat up

move randomly

react

cool down

Acetone reacts with HCN to form a cyanohydrin. It is an example of

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Nucleophilic addition

Electrophilic substitution

Electrophilic addition

Nucleophilic substitution

Metallic bonds have been explained by many theories. Luis Pauling has proposed a theory called

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molecular orbital theory

electron gas theory

band theory

valence bond theory

Which is the chemical formula of calcium super phosphate:

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CaH₂PO₄

CaHPO₄

Ca(H₂PO₄)₂

none of above

Metals are good conductor of electricity, but their conductivity decreases by increase in temperature because

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electrons attracted strongly by the nuclei which resists their free motion

atoms form ionic bond and no free electrons

electrons go to the iocalized orbital not free

positive metal ions begin to oscillate and their motion hinders the free movement of electrons

It is very much difficult to cook food at Mount Everest, because

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temperature of atmosphere is very low

the boiling point of water is 69°C

water becomes heavier

the boiling point of water is increased

Wt. of 112 ml of oxygen at NTP on liquifaction would be

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0.32 g

0.64 g

0.16 g

0.96 g

Which one of the following is not air pollutant gas

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CO

CO₂

NO

SO₂

The Catalyst used in the contact tower for the manufacture of H₂SO₄ is easily poisoned by:

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Nitrous oxide

Nitrogen gas

Arsenic oxide

Carbon dioxide

C₆H₁₂O₆is molecular formula of:

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Glucose

Dextrose

Fructose

All of these

In SO-²4 the oxidation number of sulphur is

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-8

-6

+8

+6

The temp. and pressure used for PVC polymerization is

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10°C and 10 atm

20°C and 20 atm

52°C and 9 atm

100°C and 10 atm

Ozone hole is maximum over

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Europe

Antarctica

Asia

Africa

Clemensen's reduction of ketones is carried out in

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H₂with Pd catalyst

Glycol with KOH

LiAIH₄in water

Zn-Hg with conc. HCl

The correct order of electron affinity among the following is

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F > Cl > Br

Br > Cl > F

Cl > F > Br

F > Br > Cl

How many mole of acidfied FeSO₄solution can be completely oxidized by one mole of KMNO₄?

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10

5

6

2

Which of the following reacts with chloroform and base to form phenyl isocynaide?

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Nitrobenzene

Phenol

Chlorobenzene

Aniline

Which one of the following pentafluorides cannot be formed?

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PF₅

AsF₅

SbF₅

BiF₅

Which of the following is weakly acidic in nature

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Alcohol

Phenol

Aidehyde

Amide

The wave length of visible light is 500 nm. In S.I. unit this value is

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5 x 10^-8m

5 x 10^-9m

500 x 10^-7m

500 x 10^-9m

What is the packet of energy called?

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Electron

Photon

Positron

Proton

A compound of the formula C₄H₁₀O_{reacts with sodium and undergoes oxidation to give a carbonyl compound which does not reduce Tollen's reagent, the original compound is}

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Diethyl ether

n-Butyl alcohol

Isobutyl alcohol

sec-Butyl alcohol

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