Question # 1

When methane reacts with Cl₂in the presence of diffused light the products obtained are

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Chloroform only

Carbon tetrachloride only

Chloromethane and dichloromethane

Mixture of a, b, c

Which is not the enzyme involved in the preparation of ethyl alcohol by fermentation of starch

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Diastase

Maltase

Zymase

Invertase

If the rate of decay of radioactive isotope decreases from 200 cpm to 25 cpm after 24 hours, what is its half life :

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8 hours

6 hours

4 hours

3 hours

The chemical reactivity of glass is reduced by the use of

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Fluxes

Formers

Stabilizers

None of these

Which of the following element's outermost orbits last electron has magnetic quantum number m=0?

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Na

O

Cl

N

Pure water does not conduct electricity because it

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Has low boiling point

Is almost unionized

Is neutral

Is readily decomposed

The positive ion is always smaller than the neutral atom while the negative ion is always bigger than the neutral atom. The atomic and ionic radii of Na, F, Na⁺, F^-are in ppm

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Na F Na⁺ F^-

157 72 95 136

Na F Na⁺ F^-

157 95 172 136

Na F Na⁺ F^-

72 95 136 157

Na F Na⁺ F^-

157 136 95 72

Which of the following will affect the rate :

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First step of reaction.

Last step of reaction.

Rate determining step.

Fastest step.

Which of the following is not charged particle

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Proton

Electron

Neutron

Hydrogen nucleus

Hydrolytic reaction of fats by causic soda is known as

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Acetylation

Carboxylation

Esterification

Saponification

Vegetable oils are

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Unsaturated fatty acids

Glycerides of unsaturated fatty acids

Glycerides of saturated fatty acids

Essential oils obtained from plants

The overlapping of two partially filled atomic orbital is in such a way that the probability of finding the electron pair is maximum along the axis joining the two nuclei, the bond is

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Sigma bond

Pi bond

Ionic bond

Non-polar bond

In cold countries ethylene glycol is added to water in radiators of cars during winter. It results in

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Lowering in b.pt

Reducing viscosity

Reducing specific heat

Lowering in freezing pt

Which of the following mixture of liquids show negative deviation form Raults law

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Ethyl alcohol and ether

HCI and water

Phenol- water

Chlorobenene-bromobenene

Kolb's method is not useful for the production of

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Methane

Ethane

Propane

Butane

Zwitter ion is ______ ion an amino acid

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Polar

Monopular

Dipolar

Non polar

Which of the following cannot be produced by acidic dehydration of alcohols?

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Ethers

Aldehyde

Alkyl Hydrogen sulphate

Alkene

Mark the correct statement

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Na⁺is smaller than Na atom

Na⁺is larger than Na atom

Cl^-is the smaller than Cl atom

Cl^-(ion) and Cl (atom) are equal in size

In the chemical combination of sodium and hydrogen to form NaH:

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Hydrogen atom gains an electron.

Sodium atom gains an electron.

Both the atoms share the electron.

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Alkyl benzenes are readily oxidized by axidfied

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KMnO₄

K₂CO₃

MnO₄

H₂SO₄

From ₃₉Y to ₄₈Cd are called

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Transition elements

Outer transition elements

Inner transition elements

2nd transition series

Cathode rays emitted from cathode are

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Canal rays

Protons

Electrons

Positrons

All covalent bonds formed between the two atoms are non-polar when

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Covalent bond between two non-metal atoms

Covalent bond between metal and non-metal

Covalent bond between two atoms of same element

Covalent bond between metal atoms

Enzymes are

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Proteins

Minerals

Oils

Fatty acids

According to Le-Chatelier's principal, adding heat to a solid and liquid in equilibrium will cause the

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Amount of solid to decrease

Amount of liquid to decrease

Temperature to rise

Temperature to fall

Which one of the following statements is not correct

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A molecule is the smallest particle of an element which can exist independently

He is a molecule of helium

S₈is a molecule of sulphur

O₃is a molecule of oxygen

Na reacts with phenol to produce

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H₂gas

Benzene

CO₂gas

CO gas

Oleum is

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Castor oil

Oil of vitriol

Fuming of H₂SO₄

None of them

Phenol is more readily soluble in

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Dil. HCl

Both NaOH and HCl

NaOH sol

Sodium bicarbonate solution

Which one of the following is not a nucleophile

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H₂O

H₂S

BF₃

NH₃

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