Question # 1

Which has lowest density?

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liquids

Solids

Gases

Plasma

The component of solution in larger amount is .

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Solute

Solvent

A & B

nIL

............... periodic table consist of group & periods.

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Bohr

Rutherford

Mendeleev's

Nil

Solid particles possess which one of the following motions?

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rotational motions

vibrational motions

translation motions

both translational and vibrational motions

The practical unit of concentration is

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%v/v

%v/m

%m/m

M

By electrolytic refining of copper , it is ____________ % pure.

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98

99

99.99

100

Protons carry _________ charge.

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+

_

No

Neutral

Which molecule has single covalent bond?

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O₂

N₂

CI₂

CO₂

The no. of electrons in the valence shell of alkali metals is

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1

2

4

7

The branch of chemistry which deals with inter conversion of electrical & chemical energy is:

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Biochemistry

Electrochemistry

Organic chemistry

None of these

Every system in the universe tends to lower its energy to attain ________________

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Freedom

Flow

Stability

Nil

Malic acid founds in:

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Apple

Fats

Rancid Butter

Oranges

The word acid is derived from the.

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Greek word

Latin word

English word

Arabic word.

When the magnitude of Kc is very large in indicates.

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Reaction never go to completion

Reaction is in equilibrium state

Reaction will complete after some time

Reaction has almost to completion

A strange bitter smell noticed near photocopiers is of:

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SO2

H2S

O2

O3

How many percentage of sunlight is absorbed by atmosphere gases.

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12%

18%

24%

30%

The order or reactivity of hydrogen halides with alkenes is.

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HI/Br

HBr > HI

HCl > HBr

HBr>HCl

Temporary hardness is because of.

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Ca(HCO₃)₂

CaCO₃

MgCO₃

MgSO₄

Reaction which have comparable amount of reactants and products at equilibrium state have.

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Very small Kc value

Very large Kc value

Moderate Kc value

None of these

The pH of water containing CO₂ is

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4-6

5.6-6

6-7

7-8

What gas is the major constituent of troposphere?

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Nitrogen

Oxygen

Hydrogen

Both a and b

The meaning of latin word acidus is.

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Sweet

Tasteless

Salty

Sour

One mole of Carbon -12 has mass

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0.012 kg

1 kg

0.022 kg

12 kg

The unit of rate constant is same as that of rate of reaction in

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first order reaction

Second order reaction

Third order reaction

Zero order reaction

The sum of pH and pOH is

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0

7

14

10

Borax has the chemical formula.

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KNO3

Na2B3O7.10H2O

Na2CO3

NaNO3

Some impurities of MgCl2 are present in NaCl which separation technique can be used to separate the impurities.

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Filtration

Crystallization

Common ion effect

Chromatography

From which quantum number is the shape of an orbital determined.

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Principal

Magnetic

Azimuthal

Spin

A glass is full of water and contains 6.02 x 10²³molecules of H2O The mass of water molecules is.

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18 gm

90 g

120 g

180 g

Optimum pressure in Haber's process for synthesis of Ammonia is

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100 -150 atm

200- 300 atm

350 - 450 atm

500 - 600 atm

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 mass of one mole of electrons is.

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1.008 mg

0.55 mg

0.184 mg

1.673 mg

The process in which liquid can be made to boil at low temperature in known as .........distillation

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Simple

Thermal

Steam

Vacuum

Which halogen will react spontaneously with Au to produce Au3+

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Br2

F2

I2

Cl2

In group VA elements the most electronegative elements is.

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Sb

N

P

As

Woody raw material for paper pulp is obtained from

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Cotton

Bagasse

Poplar

Rice straw

Which is not a calcarious material.

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Lime

Clay

Marble

Marine shell

SN1 reaction usually occurs in

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Primary alkyl halides

Secondary alkyl halides

Tertiary alkyl halides

All of these

Paraldehyde is polymer of.

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HCHO

CH3CHO

CH3COCH3

CH3CH2-CH2OH

The oxidation of NO in air produces

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N₂O₃

NO₂

N₂O₃

N₂O₄

Which one of the following is an amide

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(NH₂)₂CO

NH₂.CH₃

C₆H₅NH₂

N(CH₃)₃

The benzene molecule contains

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three double bonds

two double bonds

one double bond

delocalized pie-electron charge

The number of acidic hydrogen present in 1- Propyne is

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1

2

3

4

The correct name of CH3-CH= CH2-OH is

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2-buten -4 -ol

3-buten-I-ol

2-Buten -I-ol

Ethylene glycol