Question # 1

Smoke in air is the example of solution.

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Gas in Gas

Gas in liquid

liquid in Gas

Solid in Gas

Which has biger particles?

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Solutions

Colloids

Suspensions

True solutions

Density of a gas increases, when its:

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temperature is increased

pressure is increased

volume is kept constant

none of these

Alpha particles are double charged.

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Negative

Positive

Can be both

Nil

Number of protons+ neutrons is :

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Atomic mass

Mass numbers

Both

Nil

The colour of calcium metal flame is

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Golden yellow

Brilliant white

Brick red

Light green

The mixture of two component is called .

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Homogeneous mixture

Binary solution

Both a & b

Nil

Who discovered the proton?

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Goldstein

J.J Thomson

Neil Bohr

Ruther Ford

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

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Freedom

Flow

Stability

Nil

________________ in linear in shape.

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CO+

CO2

H2O

NH3

All metals are solid except

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AI

Mg

Na

Hg

Sum of PH and POH of a solution is:

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7

14

16

18

The number of carbon atoms present in kerosene oil.

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8-12

9-12

10-12

11-12

Number of vitamins in vitamin B complex is.

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10

8

6

12

The gas used by animals to perform respiration.

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O₂

N₂

SO₂

Cl₂

According to Lewis concept a base is a substance which can donate.

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Proton

Electron pair

Neutron

Electron

The reduction of alkyl halides takes place in the presence of.

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Zn/HCl

Na/HCl

Mg/HCl

Cu/HCl

Neurological damage is caused by the poisoning of.

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Lead

Cadimium

Mercury

All of them

Which disease is caused by polluted water.

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Cholera

Typhoid

Diarrhea

All of them

Extraction of metals from its ores is called.

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Metallurgy

Mining

Griding

All

Ozone layer is not found is

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Upper stratosphere

Mid stratosphere

Lower stratosphere

All of them

Some orchids attracts bees for pollination by producing.

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alkanes

almenes

alkynes

all the above.

One mole of ethanol and one mole of ethane have an equal

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Masses

Number of atoms

Number of electrons

Number of molecules

The nature of positive rays depends on

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The nature of electrode

The nature of discharge tube

The nature of residual gas

All of the above

During the process of crystallization, the hot saturated solution;

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Is cooled very slowly to get large-sized crystals

Is cooled at a moderated rate to get medium-sized crystals

Is evaporated to get the crystals of the product

Is mixed with an immiscible liquid to get the pure crystals of the produce

The tendency of an tom to attract shared pair of electron towards itself is called its.

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Ionization energy

Electronegativity

Electron affinity

dipole moment

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.

Which gas has highest e/m ratio

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Hydrogen

Helium

Nitrogen

Oxygen

Chromatography in which stationary phase is a solid is called.

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Partition chromatography

Paper chromatography

High pressure liquid chromatography

Adsorption chromatography

Electrode of the lead storage battery are immersed in dilute H2SO4 which has strength by mass

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100%

98%

30%

10%

Which one of the following has the same number of electrons as an alpha particle.

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H

He

H+

Li+

When one mole of each of the following is completely burned in oxygen, which gives the largest mass of carbon dioxide.

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Diamond

C2H6

Methane

CO2

A component having small value of K mostly remains in the.

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Stationary phase

Mobile phase

Chromatographic tank

Solvent

Chemical formula of stibnite on.

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BaSO4

Sb2S3

FeS2

ZnS

Bleaching powder may be produced by passing chlorine over.

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Calcium carbonate

Hydrated calcium sulphate

Anhydrous calcium sulphate

Calcium hydroxide

Which one of the following raw materials is not present in the cement.

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Lime stone

Gypsum

Blast furnace slag

Red lead

Air of the following tests are used to identify aldehydes except.

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Tollen's test

Fehling test

Baeyer's test

Benedict test

Which acid is used in the manufacture of synthetic fibre

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Formic acid

Oxalic acid

Carbonic acid

Acetic acid

Primary, Secondary and tertiary alcohols can be distinguish by.

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Iodoform test

Lucas test

Fehling solution

Ammoniacal silver nitrates

Which ion will have the maximum value of heat of hydration.

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Na+

Ca+

Ba+2

Mg+2

Majority of the elements of the periodic table are.

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Semi metals

Non metals

Metals

Noble metals

All of the following tests are used to identify aldehydes except.

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Tollen's test

Fehling test

Baeyer's test

Benedict test

P2O5 is usually used as

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Drying agent only

Reducing agent

Both drying and reducing agent

Both drying agent and oxidizing agent.

Which oxide is amphoteric in nature.

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BeO

MgO

CaO

BaO