Question # 1

Which one of the following is a galvanic cell?

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Daniel cell

Nelson's cell

Down's cell

Both B and C

In peroxides, the oxidation no. of O is

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+1

-1

+3

-3

The earth is made up of ___________ % of iron.

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4

5

6

7

105 elements were discovered by the year ________________

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1984

1974

1086

1996

H° + H° are ________________ in energy.

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Lower

Higher

Medium

Nil

"×" & "." Represent:

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Shells

Neutrons

Electrons

Atoms

All ionic compound are ________________ at room temperature.

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Liquid

Solids

Gas

Plasma

All non-metals are non-conductor of heat and electricity except it

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Phosphorous

Sulphur

Graphite

Iodine

________________ elements were discovered in year 1800.

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34

35

36

37

The value of Avogadro 'no is:

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6.023×1024

6.023×1026

6.023×1023

6.023×1020

_________ is an example of substance.

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Carbon

Hydrogrn

Oxygen

Water

Lactose and maltose are;

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monosaccharides

disaccharides

trisaccharides

tetrasaccharides

Chemical formula of Stearic acid.

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C₁₅H₃₁COOH

C₁₇H₃₅COOH

C₁₅H₃₇COOH

None of them

One of the hydrocarbons reacts with one mole of hydrogen to form a saturated hydrocarbon. What formula could be of the X.

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C₃H₈

C₆H₁₂

C₄H₁₀

C₇H₁₆

99% of atmosphere consists of .

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N₂and H₂

N₂and O₂

N₂and CO₂

O₂and CO₂

Which of the followings is a disaccharide?

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Glucose

Fructose

Sucrose

Starch

Which is present 85% in natural gas?

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Ethane

Propane

Methane

Butane

The reaction in which the products do not recombine to form reactants are called.

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Inversible reactions

Reversible reaction

Decomposition

Addition

Effects of ozone depletion are following except the one.

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Increases infectious diseases

Increases crops production

Can cause skin cancer

Can cause climatic changes.

Potassium ferrocyanide salt is.

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Normal

complex

Basic

Acidic

Hydrogenation of alkenes and alkynes may be carried out at room temperature in the presence of catalyst:

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Pt or Pd

Ni

Zn

Fe2O3

Sea water in unfit for drinking purpose die to the presence of.

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Salts

Algae

Fishes

All of them

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The rate of diffusion of a gas of molar mass 72 as compared to H2 will be.

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1/6 times

1.4 times

6 times

same

Total pressure of mixture of two gases is.

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The sum of their partial pressures.

The difference of their partial pressures

The product of their practical pressures

The ratio of their partial pressures

Fuel cells are the means by which chemical energy may be converted into

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Heat energy

Magnetic energy

Sound energy

Electric energy

Which of the following wave properties is inversely proportional to the energy for electromagnetic radiations

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Frequency

Wave number

Velocity

Wave length

When hot saturated solution is cooled very rapidly, we get

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Medium sized crystals

large sized crystals

Premature crystallization of the substance

Old crops of crystals

The largest number of molecules are present in

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3.6 of H2O

4.6 g of C2H5OH

2.8 g of CO

5.4 g of N2O5

The value of pH and P^oHof pure water at 25° C is

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14

7

1 x 10^-14

1 x 10¹⁴

Isomorphic crystals show

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Same chemical properties

Same physical properties

Same crystalline form

Same melting point

The molecules of CO₂in dry ice form the

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Ionic crystal

Covalent crystals

Molecular crystals

Any type of crystals

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

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First order reaction

Second order reaction

Zero order reaction

Third order reaction

Which one is not use of lime

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Extraction of metals

Ceramic industry

Preparation of bleaching powder

Preparation of gypsum

Which of the following gives acidic oxide

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N

As

Sb

Bi

Elimination biomolecular reactions involve.

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First order kinetics

Second order kinetics

third order kinetics

Zero order kinetics

The colour of transition metal complexes is due to

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d-d transition of electrons

Paramagnetic nature of transition elements

Ionization

Loss of s -electrons

The percentage of clay and liem stone in cement is in the ratio of.

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1 : 1

1 :2

1:3

3:1

Which substance is water repellant and used in ceramic insulators.

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Asbestos

Lead compounds

Silicon carbide

silicones

Which one of the following compound has octane number 100.

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2,2,4-trimethyl petane

n- pentane

2,4-dimethyl pentane

2- methyl pentane

Which compound form benzoic acid on oxidation with strong oxidizing agent.

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Toluene

Ethyl benzene

n propyl benzene

All

Which of the following elements is not present abundantly in earth's crust.

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Silicon

Aluminium

Sodium

Oxygen

Aluminium oxide is

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Acidic oxide

Baric oxide

Amphoteric oxide

None of these

Chemical composition of colemanite is

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Ca₂B₆O₁₁. 5H₂O

CaB₄O₇. 4H₂O

Na₂B₄O₇.4H₂O

CaNaB₅O₉. 8H₂O