Question # 1

The reverse of evaporation is:

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Boiling

Diffusion

Condensation

Freezing

All metals are solid at ________________ temperature.

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Room

High

Low

None

According to Bohr, electrons can revolve only in this orbits whose angular momentum is

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h/2π

n 2h/π

n h2/2π

n h/2π

There are _________ types of bonds.

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1

2

3

4

Which one of the following gas diffuses faster?

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hydrogen

helium

fluorine

chlorine

Solids are fixed ____________

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Shape

Velocity

Mass

Atoms

Which one of the following halogen has lowest electronegative?

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fluorine

chlorine

bromine

iodine

Amadeo Avogadro was a _______________ scientist.

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Italian

English

Greek

Russian

When temperature of water drops to ____________ °C it convert onto ice.

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0

-2

-1

1

In diamonds, carbon are ____________ bonded.

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Tetrahedrally

Single

Double

None

Oxygen is ___________

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Metals

Non-metals

Gas

b & c

A base is a substance which neutralizes an acid which of these substances is not a base?

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Aqueous ammonia

Sodium chloride

Sodium Hydroxide

Calcium Hydroxide

The functional group- COOH is found in

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Carboxylic acid

aldehydes

alcohals

easter

The accumulation of which vitamin causes bone like deposits in the kidney.

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Vitamin D

Vitamin E

Vitamin B

Vitamin A

Which one of the following is gas at room temperature:

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C2H6

C6H14

C6H6

C8H18

Alkalis react with ammonium salt to liberate.

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SO₂

CO₂

NH₃

H₂

Ammonia is prepared by the process .

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Ostwald

Haber

Clark

All

The earth atmosphere is getting hotter because of :

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SO₂

O₃

CO₂

CO

A strange bitter smell noticed near photo copier machine is of.

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H₂S

SO₂

O₂

O₃

Which one of the following is not a greenhouse Effect?

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Increasing atmosphere temperature.

Increasing food chains

increasing flood risks

Increasing sea-level

Such reactions which continue in both directions are called.

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Irreversible

Reversible

Nonreactive

Dynamic

Which gas is in involved in ozone depletion?

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Nitrogen

CFC's

Chlorine

All of them

A negative deviation from Raoult's law in solution means, the solution has

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High boiling point and high vapour pressure

High boiling point and low vapour pressure

Low boiling point and low vapour pressure

Low boiling point and high vapour pressure

The comparative rates at which the solutes move in paper chromatography depend on.

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The size of paper used

Rf values of solutes

Temperature of the experiment

Size of the chromatographic tank used

If the electron in a hydrogen atom drops from n = 6 to n =4 level, the radiation emitted is in which series of lines in the spectrum of atomic hydrogen.

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Lyman

Balmer

Paschen

Brackett

Which one of the following salts dissolved in water to form a solution with a pH greater than 7

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NaCl

CuSO4

Na2CO3

NH4Cl

Which one of the following substances is used as water absorber in combustion analysis.

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Mg(CIO4)2

50% KOH

Lime water

Dilute solution of NaOH

The drying agent used in a desiccator.

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Agcl

NH4Cl

P2O5

AlCl3

Which one of the following has the same number of electrons as an alpha particle.

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H

He

H+

Li+

Alkali and alkaline earth metal are usually obtained by

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Decomposition of their carbonates

By heating their hydroxide

electrolysis of molten metal oxides

Electrolysis of molten metal halides

The molar volume of CO2 is maximum at.

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STP

127 ^oC and 1 atm

0 ^oC and 2 atm

273 ^oC and 2 atm

The number of Na, ions which surround each CI^1-ion the NaCI crystal lattice is

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8

12

6

4

Which substance is nto a dehydrating agent.

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CaCl3

CdCl2

Silica gel

P2O5

Alkali metal whose carbonate is is relatively less stable and decomposes giving its oxides is.

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Li

Ba

K

Rb

Which one of the followings is not a pollutant.

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CO2

NO2

CO

SO2

Common names of aldehydes are derived from the common names of.

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Alcohol

Ketones

Carboxylic acids

Alkenes

Which of the following is a reddish brown gas

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N₂O₃

NO₂

N₂O₃

N₂O₅

Which can produce ketone

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Sec alcohol

Calcium acetate

Propyne

All of these

Oxide of Alkaline earth metal are

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Acid

Basic

Neutral

Amphoteric

The chemist who synthesized urea from ammonium cyanate was

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Berzelius

Kolbe

Wholer

Lavoisier

Which reaction is disproportionate reaction

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Aldol Condensation

Cannizzaros's reaction

Haloform reactions

Acid Catalyzed reactions

One of following is argillaceous material

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Marble

Clay

Lime

Marine Shell

Maximum number of unpaired electrons is in

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O₂

O₂⁺

O₂^-

O₂^2-

The most electronegative element of group V-A is

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N

P

Sb

Bi