Question # 1

Canal rays are actually

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Electrons

Protons

Neutrons

X-rays

A bond formed between two non-metals is expected to be:

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covalent

ionic

coordinate covalent

metallic

In a discharge tube, the pressure of a gas is kept at

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10-2 atm

10-4 atm

10-6 atm

10-8 atm

biology bis classified as ___________ science.

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Engineering

Physical

Natural

Chemical

When an electronegative element combines electropositive element the type of bonding is

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covalent

ionic

polar covalent

coordinate covalent

H2O is what type of molecules it is:

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Manoatomic

Polyatomic

Pentaatomic

Nil

Increase in ________________ increase evaporation.

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Temperature

Stronger

All

None of above

According to Bohr, electrons can revolve only in this orbits whose angular momentum is

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h/2π

n 2h/π

n h2/2π

n h/2π

Deuterium is used to make:

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light water

heavy water

soft water

hard water

The no. of electrons in the valence shell of noble gases are

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2

4

8

2 or 8

Films are coated by special chemical known as ____________ detectors.

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Photographic

Image

Nil

Both

The unit of molar concentration:

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mol. dm^-2

mol. dm^-1

mol. dm

mol. dm^-3

Lactose and maltose are;

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monosaccharides

disaccharides

trisaccharides

tetrasaccharides

Normaily rain water is weakly acidic because.

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SO₃

CO₂

CO₃

NO₂

Alkanes are least reactive compounds because they are.

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Saturated hydrocarbons.

Unsaturated hydrocarbons.

Both a and b

None of the above.

When glucose and fructose combine they produce

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Starch

Cellulose

Sucrose

None of these

Hydrogen atoms preset in pentane are.

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10

12

14

16

The number of carbon atoms present in diesel oil.

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10-15

11-15

12-15

13-15

Infrared radiation emitted by the earth are absorbed by?

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CO₂,H₂O

N₂,O₂

CO₂,N₂

O₂,CO₂

The process by which atmospheric nitrogen is turned into nitrates in the soil is called.

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Nitration

Fixing

Oxidation

Reduction

In dry cleaning, which chemical is used.

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Chloroform

Carbon tetachloride

Ecetaldehyde

Ethanol

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

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Proton

Electron pair

Neutron

Electron

In Daniel cell, if salt bridge is removed between the two half cells, the voltage.

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Drops to zero

Does not changes

Increases gradually

Increases rapidly

If absolute temperature of gas is doubled and the pressure is reduced to one half, the volume of the gas will.

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Remain unchanged

Increase four times

Reduce to 1/4

Be doubled

Azeotrpic mixture of two liquids boils at a lower temperature than either of them, when

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It is saturated

Is shows positive deviation from Raoult's law

It shows negative deviation from Raoult's law

Is is metastable

To achieve a good separation, the two liquids are gently shaken to increase their area of.

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Miscibility

Separation

contact

Solubility

The octet rule in not followed in the formation of

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NF₃

CF₄

CCI₄

PCI₅

Equal masses of methane and oxygen are mixed in an empty container at 25°C, the fraction of total pressure exerted by oxygen is

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1/3

8/9

1/9

16/17

If we plot a graph between I/V at x-axis and pressure at Y -axis

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a parabolic graph is obtained

By increasing temperature straight line move toward x axis

By increases temperature straight line move toward y axis.

No. change in line by increasing temperature.

In case of non volatile solute, lowering of vapour pressure is proportional to.

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Mass fraction of solute

Mole fraction of solvent

Mole fraction of solute

None of the above

Rutherford's model of atom failed because.

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The atom did not have a nucleus and electron

It did not account for the attraction between protons and neutrons.

It did not account for stability of the atom

There is actually no space between the nucleus and the electrons.

Which of the following molecule has zero dipole moment.

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NH3

CHCl3

H2O

BF3

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

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first order reaction

Second order reaction

Third order reaction

Zero order reaction

Geometrical shape of [CO(NH3)6Cl3

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linear

square planar

Octahedral

Trigonal hypyramid

A gas decolorizes alkaline KMnO4 but has no action with ammoniacal AgNO3, this gas may be

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C2H2

C2H4

C2H6

CH4

Each of the following is true for white and red phosphorus except one.

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Both are soluble in CCl4

Both can be oxidized by heating in air

Both consists of same kind of atoms

Both can be converted into each other

Which one of the following does not react with dilute sulphuric acid.

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Mg (OH)2

Mg

MgO

Mg(NO3)2

Acetaldehyde undergoes, aldol condensation in the presence of.

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dil HNO3

DIL NaOH

dil HCl

Conc. H2SO4

How many zones through which the charge passes in a rotary kiln

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4

3

2

5

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

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acid number

Saponification number

Iodine number

gold number

Aluminium oxide is

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Acidic oxide

Baric oxide

Amphoteric oxide

None of these

The temperature in the incineration of industrial and hazardous waste process has a range.

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900 to 1000 ^oC

250 to 500^oC

950 to 1300^oC

500 to 900^oC

The smog which have high contents of SO2 in it, is called.

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Reducing smog

Oxidizing smog

Natural smog

Neutral smog

Dolomite is a carbonate of

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Be

Mg

Na

Ba