Question # 1

Electrons carry _________ charge.

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+

_

Neutral

Bouble Positive

All of the following are tri-atomic molecules except:

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H²

O³

H²O

CO²

Bucky molecules have ________________ c-atoms.

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20-60

20-90

40-60

40-100

The atomic radil of the elements in periodic table:

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increase form left to right in period

increase form top to bottom

do not change form left to right in period

decrease form top to bottom in a group

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

Addition of OXYGEN is called.

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Reduction

Conduction

Oxidation

Nil

Density of a gas increases, when its:

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temperature is increased

pressure is increased

volume is kept constant

none of these

____________ solids are arranged in 3 dimension.

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Crystalline

Amorphous

Both

None

Metal oxides are

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Amphoteric

Basic

Acidic

Neutral

Atoms form chemical bonds to attain the electronic configuration of

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Halogens

Noble gases

Alkali metals

Alkaline earthmetals

Which one metal can be cut with a knife?

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Na

Mg

AI

Ca

The number of carbon atoms present in petroleum gas.

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1-2

1-3

1-4

1-5

Which gas like a glass wall of g green house:

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CO

O2

CO2

N2

The impurities associated with the minerals are known as:

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Metallurgy

Ores

Gangue

Compounds

Which metal present in acid rain affect the aquatic life by clogging fish gills?

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Lead

Chromium

Aluminium

Mercury

The % age of carbon is bituminous is

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60

70

80

90

The nature of enzyme is.

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Protein

Vitamin

Fats

Carbohydrate

Which gas is evolved when acids react with carbonates and bicarbonates?

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Carbon monoxide

Carbon dioxide

Hydrogen

Hydrogen chloride

Catalytic converters convert.

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CO to CO₂

N₂ to NO

CO₂ to CO

N₂to NO₂

Acetic acid is used for:

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Elching designs

Clearing metals

Flavouring food

Making explosives

Which of the following can be used as a fuel?

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Methanol

Ethanol

Bio-diesel

All of them

_________ acid is used in lead storage batteries as electrolyte.

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CH₃COOH

HCl

HNO₃

H₂SO₄

If we want to change O₂to O₂^-1The electron is to be placed in

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Which of the following species has unpaired electrons in anti bonding molecular orbitals

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O2

N2

B2

F2

What is oxidation state of chlorine in Ca(ClO3)2

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+1

+3

+5

+7

When 6d orbital is complete, the entering electron goes into.

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7f

7s

7p

7d

When solid KI dissolved in water, its heat of solution is positive. What would happen to dissolution when temperature is increased.

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Increases

Decreases

Remain same

Firs increases than decreases

Which statement is incorrect about order of reaction

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It cannot be determined experimentally

It is determined experimentally

Sum of exponents in rate equation

It can have fraction value

The effect of temperature on equilibrium was studied by

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Lewis

Van der wall

Arrhenius

Vant hoff

According to classical concept, oxidation involves

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Addition of oxygen

Addition of electron

Removal of hydrogen

All are correct

During combustion analysis, CO2 produced is absorbed in

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Mg (CLO4)2

50% KOH

CaCl2

P2O5

The wave number of the light emitted by a certain source is 2 x 10⁶ m-1 . The wavelength of this light will be.

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500 nm

5000 nm

200 nm

5 x10⁷ m

In gas occupies a volume of 2 dm³at 27°C and I atm pressure. The expression for its volume at S.T.P. is

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Which of the following statement is correct

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Na atom is smaller than Na⁺

Na atom is larger than K atom

F atom is smaller than F^-

F atom is larger than F^-

Which carbohydrate can be used for silvering of mirror.

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Glucose

Fructose

Maltose

All

Out of the elements of group VA, the highest energy is possessed by

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N

P

Sb

Bi

Which one of the following alkanes will be formed by the hydrolysis of ethyl magnesium bromide

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Methane

Ethane

Butane

do not hydrolysed

In which one of the following sets do all three particles have same number of total electrone

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F- ,Cl-,Br-

Li+ , Na+ , K+

N^--3, O-2, F-,

Na+, Mg+2, K+

Plastics are a pollution problem because many plastics

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Are made from petroleum

Are very inflammable

Burn to produce toxic fumes

Decompose to produce toxic products

Which element does not have allotropic form

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Nitrogen

Phosphorous

Arsenic

Antimony

Keeping in view size of atoms ,which order is the correct one.

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Mg > Sr

Ba > Mg

Lu > Ce

Cl > I

In t-butyl alcohol, the tertiary carbon is bonded

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Three hydrogen atoms

Two hydrogen atoms

One hydrogen atom

No hydrogen atom

Ketones are prepared by the oxidation of.

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Primary alcohol

Secondary alcohol

Tertiary alcohol

None of these

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

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Ethene

Ethyne

Methane

Propane