Question # 1

Mass no is represented by :

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A

B

C

D

Which one is moderate reactive metal?

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Pb

Na

Ca

Mg

Canal rays are actually

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Electrons

Protons

Neutrons

X-rays

________________ elements were discovered in year 1800.

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34

35

36

37

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

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H2S

Br2

S

2HBr

Which one is strong electrolyte ?

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NH4OH

NaOH

a & b

Nil

_________ which occupies space and have mass.

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Matter

Atom

Molecule

All of above

The branch of chemistry which deals with qualitative & quantitative analysis of matter is :

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Analytical

Nuclear

Biochemistry

Organic

Which one is largest?

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Exo

Peta

Atto

Pico

Number of protons+ neutrons is :

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Atomic mass

Mass numbers

Both

Nil

In period, ionization energy of elements

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Increases

Decreases

Remains constant

None of these

Which gas is also known as life gas for plants.

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CO

CO₂

O₂

NO₂

Raw materials used in Solvay's process.

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Brine

Lime stone

Ammonia gas

All

Alkanes are also called:

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olefins

Paraffins

aliphatic compound

cyclic compounds

Which one of the following is a fat soluble vitamin?

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A

E

K

All of these

In shoe polished, which chemical is used.

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Ethanol

Methanol

Carbon black

Formaldehyde

Which one is not the fraction of residual oil?

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Paraffin wax

Asphalt

Fuel oil

Coke

The example of heterocyclic compound is.

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Benzene

Hexane

Cyclohexane

Pyridine

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

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Salts

Algae

Fishes

All of them

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

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CH₄

C₁₀H₂₀

C₂H₂

C₂H₄

Thermosphere lies beyond.

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Stratosphere

Troposphere

Mesosphere

Biosphere

Which of the following is a secondary pollutant.

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CO₂

CO

SO₃

HF

Many element have fractional atomic masses. This is because.

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the mass of the atom is itself fractional

Atomic masses are average mases of Isobars

Atomic masses are average masses Isotopes

Atomic masses are average masses of Isotopes proportional to their relative abundance.

In silver oxide battery, anode is made of.

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Zinc

Copper

Lead

Graphite

How many moles of AgCI are produced by combination of 1.0 mole of AgNO₃and 2.0 mole of NaCI

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1.0

2.0

3.0

4.0

The gain of electron is known as.

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Oxidation

Reduction

Dehydration

Dehydrogenation

The velocity of photon is.

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Depends on its source

Equal to square of its amplitude

Depends on its wavelength

Independent of its wavelength

Anode rays were discovered by

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J. Stoney

Rutherford

J.J. Thomson

Goldstein

The ration of number of molecules of 2 g H2 g to number of molecules of 64 g gaseous oxygen is.

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1:1

1:2

1:32

1:4

Keeping the temperature constant of the gas is expanded.

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Pressure will decrease

Temperature will increase

Kinetic energy of molecules will increase

No. of gas molecules increases

Allotropy is the property of.

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Compound

Element

Atom

Mixtuer

The difference of potential of two electrodes when concentration of solution is 1 M each at 25^oC and 1 atmosphere is called.

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Electrode potential

Standard cell potential

Cell reaction

Cell voltage

Which properties of liquid is measured by polarimeter

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Conductance

Refractive index

Optical activity

Change in volume

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

Which one of the following is formed when ethyne is heated in copper tube at 300 ^oC

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Ethene

Ethane

Benzene

Cyclohexane

In modern periodic table VI period contains elements

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8

18

10

32

Absolute alcohol can be obtained from rectified spirit by

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By adding sodium metal

By extraction

By predistillation in the presence of CaO

Not possible because of azeotropic mixture

Which elements are needed for healthy growth of plants

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N,S,P

N,Ca,P

N,P,K

N,K,C

For which mechanisms, the first step involved is the same

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E₁and E₂

E₂and SN₂

E₁and E₂

E₁and SN₁

During nitration of benzene, the active nitrating agent is

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NO₃

NO₂⁺

NO₂^-

HNO₃

Which halogen occurs naturally in a positive oxidation state.

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Fluorine

Chlorine

Bromine

Iodine

The general representation for Grignard reagent is.

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RMgX

ReMgX

RXMg

RMgX2

Which one of the following is a condensation polymer

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Polystyrene

Polyester

Polyethene

Nylon 6,6

Mono saccharides contain carbon atoms.

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3 to 6

3 to 7

3 to 9

only six