Question # 1

Br2 + H2S __ 2HBr + S, which one is oxidizing agent:

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H2S

Br2

S

2HBr

Which one is least reactive non-metal?

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P

C

CI

F

The symbol of barium is:

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Ba

Bi

Br

B

It is a good reducing agent

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Fe

H

C

O

Halogens with metals for

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Ionic bond

Covalent bond

Dative covalent bond

Metallic bond

The solution in which one component is aqueous ____________ solution.

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Aqueous

Binary

All

None

Octet rule is:

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description of eight electrons

picture of electronic configuration

covalent bonding

attaining of eight electrons

The value of Avogadro 'no is:

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6.023×1024

6.023×1026

6.023×1023

6.023×1020

Alpha particles are double charged.

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Negative

Positive

Can be both

Nil

Which one of the following gas diffuses faster?

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hydrogen

helium

fluorine

chlorine

The isotopes C-12 is present in abundance of:

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96.6%

97.6%

99.7%

None of these

When NaHCO₃is heated if forms:

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CO₂

Ca(OH)₂

CaCO₃

CaO

Which gas like a glass wall of g green house:

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CO

O2

CO2

N2

Lactose and maltose are;

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monosaccharides

disaccharides

trisaccharides

tetrasaccharides

Chemical formula of matte will:

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Cu2S.FeS

Cu2S

Cu2O

FeS

In solvay's process slaked lime is used to:

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Prepare CO₂

Prepare quick lime

Recover ammonia

Form Na₂CO₃

Which one of the following gases is used to destroy harmful bacteria in water.

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Iodine

Chlorine

Fluorine

Bromine

When acid reacts with sulphites and Bi sulphates which gas is evolved?

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H2

CO₂

SO₂

NH₃

How many percentage of sunlight is absorbed by atmosphere gases.

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12%

18%

24%

30%

General formula of Alkane is.

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C₁₀H_2n-2

C₆H₂₆

C₁₁H_2n-2

C_nH_2n-2

the removal of which ion causes water softening.

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Na⁺

Mg²

Li⁺

K⁺

Which salt cause permanent hardness in water is:

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Ca(HCO₃)₂

Mg(HCO₃)₂

CaCl₂

KCl

"The components of which mixture can be separated by filtration".

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NaCl and CaCl2

Calcium carbonate and NaCl

Blue and green inks

Sand and naphthalene

A single lead cell provides volts

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2

4

6

8

Calorie is equivalent to

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0.4184 J

41.84 J

4.184 J

418.4 J

Dipole moment is defined as.

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Charge x distance

Charge x Debye

Charge x displacement

Charge x bond energy

In H2SO4the oxidation number of 'S' is

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+2

+6

+8

+4

Stronger the oxidizing agent greater is the

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Oxidation potential

Reduction potential

Redox potential

E.M.F of cell

In zero order reaction, the rate is independent of

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Temperature of reaction

Concentration of reactants

Concentration of products

None of these

Standard enthalpy change when one mole of compound is formed from their elements at standard state is.

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Heat of formation

Standard heat of formation

Heat of combustion

Standard Heat of neutralization

Bohr's model of atom is contradicted b y.

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Planck quantum theory

Quantization of energy of electrons

Heisenberg's uncertainty principle

Quantization of angular momentum

Long chains of amino acids are coiled about one another into a spiral by

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Covalent bond

Ionic bond

Hydrogen bond

Van Der Waal's forces

Which technique is used ot determine the absorption of radiations.

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Spectrometry

dilatometer method

Refractometric method

Optical rotation method

which one is not fossil fuel

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Petroleum

Natural gas

Coal

Alcohol

The pH range of the acid rain is.

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7-6.5

6.5-6

6-6.5

Less than 5

Disinfection of water by chlorine is done by the production of.

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NH2Cl

NCl2

HOCl

NHCl2

Which property of triglycerides is used to determine its molecular mass.

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acid number

Saponification number

Iodine number

gold number

In which compound, the oxidation state of boron in not +3

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H2BO3

Ca2B2O11

Na2B4O7

Mg3B2

Which of the following the highest hydration energy

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Li⁺

Na⁺

K⁺

Mg⁺⁺

An alkyl halide may be converted to alcohol by

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Addition

Substitution

Dehydrohalogenation

Elimination

-------------------- is Alcohol in the following

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CH₃.CH₂.OH

CH₃.O.CH₃

CH₃COOH

CH₃.CH₂.SH

Which one of the following species is not an electrophile.

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HN3

Br

H+

BF3

Aromatic compounds burns with sooty flame because.

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They have high percentage of hydrogen

The have a right structure

The have high percentage of carbon

The resist reaction with air

What criteria did Mendeleev use in arranging his periodic table.

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Atomic mass

Atomic number

Mass number

Density