Question # 1

Cholesterol is a precursor of steroid hormones, Choose the class of steroid:

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a carbohydrate

a hydrocarbon

a natural lipid

a protein a hydrocarbon

At different temperature, the vapour pressure of water is

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different

same

low

high

Equal volumes of all gases at STP contain equal no of molecules is called

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Dalton's law of partial pressure

Graham'a law of diffusion

Avogadro's law

None

Which of the following solids does not have a covalent bond?

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Silica

Copper

Diamond

Graphite

Why a C- C bond breaks by uv light

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Cl is most electronegative

Cl is volatile

C - Cl bond energy is smaller than that of C - H bond energy

uv light provides energy which is sufficient to break C - Cl bond and not C - H bond

_{What is name of hydrated variety of quartz?}

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Rose quartz

Smokey quartz

Silica

Opal

The aliphatic compounds are of two types

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Straight chain and cyclic

Branched chain and alicyclic

Straight chain and branched

Homocyclic and alicyclic

Which of the following is not a correct postulate of the kinetic theory of gases

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the gas molecules are in random motion

the collision between the molecules are perfectly elastic

the average kinetic energies of different gases are equal at a particular temperature

the pressure exerted on the walls of the container is due to intermolecular forces

By convention, the standard heat of formation of all elements is assumed to be

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Zero

positive

Negative

Infinity

Which of the following has isomorphous structure

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NaF

S

Sn

N

Elements of group IA and IIA are

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electronegative

neutral

electropositive

non-metals

When the rate of formation of reactants is equal to the rate of formation of products, this is known as

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Chemical reaction

Chemical equilibrium

Chemical kinetics

None

The coinage metals are

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Ni, Pd, Pt

Cu, Ag, Au

Zn, Al, Pb

Fe, Si, Sn

C- X bond is strong in

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CH₃Cl

CH₃Br

CH₃F

CH₃I

All the following decompose easily on heating to give oxygen except

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Lead nitrate

Potassium chlorate

Mercuric oxide

Manganese dioxide

Write the name of following alkene CH₂= CH - CH = CH₂

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1,3 butadiene

Butra -1, 3-diene

Both a & b

None

The element with highest electron affinity among the halogen is

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F

Cl

Br

I

Zn + HCI are used in

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Clemenson reduction

Wof kishner reduction

Kolb's electrolysis

Wutruz reaction

Which of the following waste material is not recycled for use again

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Paper

Plastic

Hides of animals

Glass

Which of the following statement is correct for a chemical reaction to occur molecules of substances must

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Collide with each other

Collide with energy more than activation energy

Collide with energy less than activation energy

Collide with high frequency

Stainless steel contains Cr upto

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12%

18%

10%

5%

Photons of yellow colour are ______ energetic than violet colour

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More

Less

Equal

None

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