Question # 1

Which one of the following is the most penetrating?

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protons

electrons

neutrons

alpha paticles

The most abundant element occurring in the oceans is:

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Oxygen

Hydrogen

Nitrogen

Silicon

One atmospheric pressure is equal to how many pascals?

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101325

10325

106075

10523

An atom having six electrons in its achieve noble electronic configuration by:

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gaining one electron

losing all electrons

gaining two electrons

losing two electrons

Salt & water is a _________ mixture.

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Homogeneous

Heterogeneous

It is not mixture

Nil

Electron ________________ energy when they jump from low to higher level.

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Absorb

Radiate

Nothing

Nil

Atoms are arranged in ________________ structure in Bucky balls.

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Hollow

Cage

A & B

Nil

Non-metals do not reaction with

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Strong bases

Concentrated acids

Dilute acids

Salts

Atoms form chemical bonds to attain the electronic configuration of

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Halogens

Noble gases

Alkali metals

Alkaline earthmetals

Non-metals are generally soft, but which one of the following is extremely hard?

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Graphite

Phosphorus

Iodine

Diamond

____________ solids are arranged in 3 dimension.

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Crystalline

Amorphous

Both

None

Water molecule has a structure:

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Ionic

Non polar

Tetrahedral

Polar

In a chemical reaction, the substance that combine are called.

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Reactant

Products

Mass

Material

How trace amount of acetylene present in the coat gas.

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0.06%

0.07%

0.08%

0.09%

The number of carbon atoms present in gasoline or petrol.

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5-10

6-10

7-10

8-10

In solvay's process slaked lime is used to:

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Prepare CO₂

Prepare quick lime

Recover ammonia

Form Na₂CO₃

Ethyne is oxidized by alkaline KMnO₄ then ....... hydroxyl group add to the triple bond.

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Two

Three

Four

Five

Which one of the following vitamins is water soluble?

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Vitamin A

Vitamin C

Vitamin D

Vitamin E

Which one of the following is not an air pollutants?

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Nitrogen

Carbon dioxide

Nitrogen oxide

Ozone

The unit of molar concentration is:

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moldm^-3

moldm⁺³

molcm^-3

molcm⁺³

Which of the following is a poisonous gas.

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Oxygen

Ozone

Nitrogen

Carbon dioxide

Main component of natural gas is

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Methane

propane

Butane

Propene

Diamond is bad conductor because.

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It has a tight structure

It has a high density

It is transparent to light

There are o free electros present in the crystal of diamond to conduct electricity.

The cell in which a non spontaneous redox reaction takes place as a result of electricity is known as.

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Voltaic cell

Denial cell

dry Cell

Electrolytic cell

The largest number of molecule are present.

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3.6 g of H2O

4.6 g of C2H5OH

2.8 g of CO

5.4 g of N2O5

Which of the following particles would on losing an electron has its outermost p-orbital as half filled

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Nitrogen atom

O⁺ion

P^-1ion

S⁺¹ion

If 2 mol of an ideal gas at 546 K occupy a volume of 44.8 dm3, the pressure must be.

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1 atm

2 atm

3 atm

4 atm

Which mixture of gases is used by the deep sea divers.

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Oxygen and nitrogen

Oxygen and helium

Oxygen and carbon di oxide

Oxygen and water vapours

The diffusion of gases at absolute zero will be

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Unchanged

Zero

slightly decreases

Slightly increases

Which one of the following gases cannot be liquefied by Line's method.

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Water vapours

NH3

Nitrogen

H2

Boiling point of a liquid is high when

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There is no hydrogen bonding

Dipole moment is zero

Inter molecular forces are weak

Hydrogen bonding is present

Which is not a molecular ion.

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He+

CH3+

NH3-

CO+

Which solution is an example of solid in gas

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Fog

Steel

smoke

Air

Alcohol obtained by fermentation is only upto

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10%

12%

20%

95%

Which compound will have maximum repulsion with H2O

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C6H6

C2H5OH

CH2CH2CH2OH

CH5-O-OH3

Which one of the following gases is used for artificial ripening of fruits

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Ethene

Ethyne

Methane

Propane

In a period, from left to right in the periodic table, the size of atom generally.

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Increases

decreases

Remains constant

First increase upto the middle of period and then decreases

What type of reaction occurs between ethene and hydrogen.

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Addition

Substitution

Oxidation

Dehydration

Which one of the following gases exist in monoatomic form.

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Ozone

Nitrogen

Krypton

Phosphine

Which of the following compounds will not give Iodoform test on treatment with I₂/ NaOH

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Acetaldehyde

Acetone

Butanone

3-Pentanone

Chlomyl chloride test is used for the confirmation of

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Cl-

CO3^-2

NO3-

Cu2+

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.

Chile saltpeter has the chemical formula

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NaNO3

KNO3

Na2B4O7

Na2CO3.H2O

Basicity of ortho phosphoric acid is.

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1

2

3

4