Question # 1

Number of isotopes of hydrogen is

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2

5

4

3

How many electrons are involved in the formation of signle covalent bond

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One

Two

Three

Four

Period nuebr tells abou the

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No. of valance electrons

No. of electronic shells

Both a and b

None of the above

A covalent bond formed by two similar stoms is known as.

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Polar Covalent bond

Metallic bond

Double covalent bond

Non-polar covalent bond

1- gram atom of carbon contain hwo many moles.

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1 mole

2 mole

6 moles

12 moles

Which branch of chemistry deals with the study of stars, planets, comets and interstellar space.

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Physical chemistry

Medcinal chemistry

Astrochemistry

Geochemistry

When the rate of the forward reaction takes place at the rate of reverse reaction the composition of the reaction mixgure remains consant. It is called.

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Chemical Equilibrium

Static equilirbirum

Both a and b

None of the above

How many moles are there in 25 g of H₂SO₄?

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0.765 Moles

0.255 moles

0.4 moles

0.51 moles

Which form of carbon is used as a lubricant?

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Coal

Diamond

Charcoal

Graphite

Silicon belongs to Grou IVA . It has ....electons in the valence shell

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2

6

3

4

At what temperature , rate of ammonia formation and decomposition is the highest.

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200 ^oC

300^oC

400 ^oC

500 ^oC

Which base is more corrosive?

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NH₄OH

NaOH

Ca(OH)₂

AL(OH)₂

The % age of carbon in peat is :

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60%

70%

80%

90%

Formula of Methyl alcohol

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CH₅-OH

CH₃-CH₂-OH

All of them

None of these

Inland water includes.

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River

Lakes

Streams

All of them

Chemical formula for urea is:

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NH4CNO

NH4CH

NH2CONH2

NH4CI

Which hydrocarbon has no effect on an aqueous solution of bromine.

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CH₄

C₁₀H₂₀

C₂H₂

C₂H₄

The major components of Atmosphere are:

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Carbon and Nitrogen

Nitrogen and Oxygen

Oxygen and Chlorine

None of these

Which gas is also known as life gas for plants.

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CO

CO₂

O₂

NO₂

Which one of these is used as anaesthesia?

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carbon black

Mehtane

Ethane

Chloroform

Global warming causes rising of the sea level. The cause of global warming is.

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CO₂ gas.

SO₂gas.

NO₂gases.

O₃gas.

Potassium Ferrocyanide is a:

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Normal salt

Mixed salt

Complex salt

Double salt

In silver oxide battery, anode is made of.

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Zinc

Copper

Lead

Graphite

Which one of the following substances is used as decolouring agent

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Animal charcol

Concentrated H₂SO₄

CaCI₂

Silica gel

Which of the following species has unpaired electrons in anti-bonding molecular orbitals

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O₂⁺²

N₂^-2

B₂

F₂

pH of rain water.

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7

Slightly basic

slightly acidic

Highly basic

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

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NaCl

CuSO4

Na2CO3

NH4Cl

The line of the balmer series in the visible region of the spectrum, but the limiting line, in the series lies in

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Visible region

X-Ray region

I.R region

U.V. region

The total kinetic energy of one mole of an ideal gas is given by

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3/2 RT

1/2 KT

1/2 RT

3/2 KT

If the volumes of reactants and products are same in a gaseous phase reaction, then the equilibrium state is not affected by

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Change of temperature

Change of pressure

Change of concentration

Catalyst

The structure of water molecule is.

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angular

Linear

Trigonal

Trigonal pyramidal

A pressure cooker reduces cooking time because.

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Heat is uniformly distributed

Boiling point of water rises

A large flame is used

Vapour pressure of liquid reduces

Dipole moment of CO2 is.

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1.25 D

1.85 D

3.1 D

Zero

When acetylene is heated at 300 ^oC in copper tube, the product obtained is.

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Benzene

Alkyl benzene

Ether

Alcohol

The nitrogen present in some fertilizers helps plants

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to fight against diseases

to produce fat

to undergo photosynthesis

to produce protien

The number of possible isomers of xylene are

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2

3

4

5

NH4NO3 on heating at 200 ^oC changes to

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N2O

NO

NO2

N2O4

Phosphorous helps the growth of

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root

leave

stem

seed

What is Glacial acetic acid

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Pure acetic acid

95% acetic acid

a mixture of acetic acid and glycerol

Vinegar

When concentrated H2SO4 and solid sodium chloride react together at room temperature the product are.

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Two salts only

A salt and a base

A salt and an acid

A salt and water

Acetylene polymerized in the presence of ammonium chloride and cuprous chloride ot form.

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Benzene

PVC

Di vieiyl acetylene

Polyethene

Alcohol obtained by fermentation is only upto

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10%

12%

20%

95%

Which one is not electrophile

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BF3

SO3

AlCl3

NH3

The carbon atom of carbonyl group is hybridized

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Sp

Sp²

Sp³

dsp²