Question # 1

Which one of the followings has polar covalent bonds hut is overall nom-polar molecule:

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HF

CO₂

CH₄

N₂

About 25% of earth crust mass is made up of element

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Oxygen

Silicon

Aluminium

Aluminates

Tertiary aleohols producewith acidified KMno,

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Ketones

Aldehydes

Malonic acid

Alkene

Ozone in stratosphere extends upto km:

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0-15 km

10-15 km

15-40 km

15-25 km

Lind's ,method for liquefaction of gases is based on the principle of:

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Graham's law of diffusion

Joule Thomson effect

Avogadro's hypothesis

Dalton's law of partial pressure

Stronger is the oxidizing agent, stronger is the

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emf of cell

Oxidation potential

Reduction potential

The nature of crystals formed due to London forces of interaction are

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molecular

metallic

ionic

covalent

The boiling point of H2O is 100°C while that of C2H5-OH is 78.5C°. The reason is that:

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H2O molecules are small-sized

the bond angles at oxygen atom are different

C2H5-group is electron donating

the number of H-bonds are greater in H20, than C2H5-OH

Which alkaline earth metal makes peroxide?

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Ba

Be

Mg

Ca

The law of distribution of energy is given by

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Clausius

Maxwell

Bernoulli

Boltzmann

pH of 10-4 mole dm-3 of HCl

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2

4

3

5

If we remove one hydrogen atom from an alkane we obtain a group called

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Acetyle group

Formyle group

Alkyle group

Ketyle group

Which of the followingα-Amino acids has basic R-group

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Proline

Glutamic acid

Histidine

Valine

Which of the following species participate in sulphonation of benzene ring?

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H2SO4

HSO4

SO3

SO^-₂

Colligative properties are the properties of :

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Dilute solutions which behave as nearly ideal solutions.

Concentrated solutions which behave as nearly non-ideal solutions.

Both(i) and (ii)

Neither (i) nor (ii)

Macromolecules or polymers are large molecules built up from small molecules called monomers. This hypothesis put forward by

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Schrodixger

Standinger

Lewis

Newton

Polyester resins have special use in:

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Clothing

Paints

Emulsion

Floor covering

The freezing mixture used in ice cream machine consists of ice and

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NaCI

KCI

MgCI₂

NaNO₃

Which of the following reagents is used to distinguish between methanoic acid and ethanoic acid?

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Amm. silver nitrate solution

Neutral ferric chloride

Sodium hydroxide solution

Sodium carbonate solution

Ionization potential increases in moving from left to right in a period

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Because nuclear charge increase

Because atomic size decrease

Both (a) and (b)

Because atomic size increases

The high molecular weight materials which yield on hydrolysis the amino acids is called:

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Carbohydrates

Lipids

Fatty acids

Proteins

The base used in Cannizzaro's reaction is

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NaOH

KOH

CHI₃

All of these

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