Question # 1

Which is an acceptor molecule/ion?

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N₂

O₂

H⁺

CH₄

Which pair of compounds is soluble?

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Ether and water

KCI and water

Benzene and water

Petrol and water

Which one of the following does not affect the boiling point?

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intermolecular forces

external pressure

nature of liquid

initial temperature of liquid

Films are coated by special chemical known as ____________ detectors.

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Photographic

Image

Nil

Both

________________ observed that formation of covalent bonds.

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Rutherford

G.N Lewis

Both a and b

Bohar's

Metals lose their electrons easily because:

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They are electronegative

They have electron affinity

They are electropositive

Good conductors of heat

Electrons carry _________ charge.

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+

_

Neutral

Bouble Positive

Concentration is ratio of:

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solvent to solute

solute to solution

solvent to solution

both a and b

If the solute-solute forces are strong enough than those of solute- solvent force, The solute:

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dissolves readily

does not dissolve

dissolve slowly

dissolves and precipitates

All are noble metals except:

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Silver

Gold

Hydrogen

Platinum

The elements of group 17 are called:

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Carbon family

Noble gases

Alkaline earth metals

Halogen family

Ozone layer is not found is

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Upper stratosphere

Mid stratosphere

Lower stratosphere

All of them

The 1st organic compound prepared in laboratory.

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Urea

NaCl

Thiourea

Pyridine

the removal of which ion causes water softening.

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Na⁺

Mg²

Li⁺

K⁺

Ozone is formed in:

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Troposphere

Stratosphere

Mesosphere

Thermosphere

Incomplete combustion of alkanes produce.

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Carbon dixoide only

Carbon monoxide only

Carbon monoxide carbon black and water

Carbon dioxide and carbon black

Which disease cause by deficiency of vitamin D?

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Rickets

Anemia in babies

Scurvy

Night blindness

General formula of alcohols is:

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RCHO

ROH

O= R - C -OH

O = R - C- R

The order of reactivity of hydrogen halides with alkenes is:

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HI>HBR

HBr>HI

HCl>HBr

HBr>HCl

Gypsum in water is.

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Sparingly soluble

Insoluble

Highly soluble

None of them

Essential components of every living all are.

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Nucleic acids

Enzymes

Lipids

Cell wall

The order or reactivity of hydrogen halides with alkenes is.

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HI/Br

HBr > HI

HCl > HBr

HBr>HCl

Quantum number value for 2p sub shell are

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n = 2, I = 1

n = 1, l =1

n = 1, l = 0

n = 2, l = 0

A single lead cell provides volts

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2

4

6

8

For a given process, the heat chagnes of constant pressure and at constant volume are related to each other as.

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qp= qv

qp<qv

qp>qv

None of these

Which of the following has bond angle of 120 ^o

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BeCl2

BF3

CH4

NH3

Forces of attraction between He atoms are.

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Hydrogen bonding

London forces

Debye forces

Ion dipole forces

The oxidation of O -atom in OF3 is.

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-2

+2

-1

+1

Down the VII -A group, polarizability generally.

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Increases

Decreases

Remain constant

Negligible

From which quantum number is the shape of an orbital determined.

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Principal

Magnetic

Azimuthal

Spin

The rate of reaction

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Increases as the reaction proceeds

Decreases as the reaction proceeds

Remains the same as the reaction proceeds

May decrease or increase as the reaction proceeds

Which of the following value of heat of formation indicates that the product is least stable.

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-94 KJ

-231.6 KJ

+21.4 KJ

+70 KJ

Diamond is a bad conductor because.

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It has tight structure.

It has a high density

There is no free electron present in the crystal of diamond to conduct electricity

None of the above

Typical transition element is

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Sc

CO

Ra

Y

Micro-nutrient is required in quantity for plant growth ranging from

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4-40 gm

6-200 gm

6-200 kg

4-40 kg

The fiber which is made from acrylonitrile as monomer

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PVC

Polyester fiber

Rayon fiber

Acrylic fiber

A polymeric substance that is formed in the liquid state and then hardened to a rigid solid is called a

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fibre

plastic

varnish

polyamide resin

The degree of unsaturation of fat is measured by

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Iodine number

Oxidation number

Reduction number

Saponification value

Micronutrients are required in quantity ranging from

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4g-40g

6g-200g

6kg-200kg

4kg-40kg

Which compound shows maximum hydrogen bonding with water

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CH₃OH

C₂H₅OH

CH₃- O - CH₃

C₆H₅OH

Which class of elements shows law value of first ionization potential.

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Alkali metals

Alkaline earth metals

Halogens

Noble gases

In which ore carbon is present

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Magnesite

Epsom salt

Barite

Sylvite

The strength of binding energy of transition elements depend upon

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number of electron pairs

number of unpaired electron pairs

number of neutrons

number of protons

Laughing gas is chemically

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NO

NO₂

N₂O

N₄O₄