Question # 1

The distance between the neclei of two carbon atoms in its elemetnal from is

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150 pm

152 pm

154 pm

156 pm

Emperical Formula of Glucose is

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CH2O

CHO

CHO2

C2HO

The element having less value of ionizatin energy and less value of electron affinity is likely to belong to.

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Group1

Group 13

Group 16

Group 17

Which of the following is a heterogeneous mixture

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Concrete mixture

a solution of potassium nitrate in water

a solution of calcium hydroxide in water

Hot chocolate

Whcih of the following atoms obey duplet rule.

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O₂

Cl₂

H₂

Li₂

-------------acts are reserve energy sources.

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Enzymes

Vitamins

Proteins

Lipids

The crystals of whic substance has rhombic shape?

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Brass

Bronze

Sulphur

Grahite

Empricial formula of sand is.

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SiO2

SiO3

SiO4

SiO

Covalent Bond involves the

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Sharing of electrons

Repulsion of electrons

Acceptance of electrons

Donation of electrons

How many elements are present in each 4th and 5th period.

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2

8

32

18

The branch of chemistry that focuses on the study of polymers, their types properties, uses is called.

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Industrial chemistry

Polymer chemistry

Organic chemistry

Astrochemistry

Which gas acts as a glass wall of a green house?

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Oxygen

Carbon dioxides

sulphur dioxide

Hydrogen

Nucleic acids made up of long chain of.

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Nucleotide

Fatty acids

Amino acid

None of them

Chemical formula for urea is:

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NH4CNO

NH4CH

NH2CONH2

NH4CI

Which one of these protects us against the disease;

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Carbohydrates

Lipids

Proteins

all of these

Which hydrocarbon decolorizes the pink colour of acidic solution of potassium permanganate?

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CH₄

C₂H₄

C₂H₆

C₂H₅

Which one of the following is non- reducing in nature;

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glucose

fructose

starch

sucrose

In which of the following groups, oxygen is attached on both sides with carbon atoms?

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Ketone

Ether

Aldehyde

Ester

A reaction between an acid and base produce.

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Salt and water

Salt and gas

Salt and acid

Salt and bases

Which is disaccharide?

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Glucose

Fructose

Sucrose

Starch

On hydrolysis sucrose produces one unit of glucose and one unit of.

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Fructose

Starch

Cellulose

None of them

Conversion of wood into coal is called.

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Carbonization

Destructive distillation

Fractional distillation

All

London dispersion force are the only forces present among the.

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Molecules of water in liquid state

Atoms of helium in gaseous state at high temperature

Molecule of solid iodine

Molecules of hydrogen chloride gas

At constant temperature in a given mass of and ideal gas.

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The ratio of pressure and volume remains constant

Volume always remains constant

Pressure always remains constant

The product of pressure and volume remains constant

Observed pressure is less than ideal pressure for any gas due to

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Intermolecular forces

Size of molecules

Boiling point of molecules

Both a and c

18 g glucose is dissolved in 90 g o water, The relative lowering of vapour pressure is equal to.

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1/5

5.1

1/51

6

Stronger the oxidizing agent, greater is the

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oxidation potential

Reduction potential

Redox potential

E.M.F of cell

Which substance is nto a dehydrating agent.

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CaCl3

CdCl2

Silica gel

P2O5

Diamond is bad conductor because.

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It has a tight structure

It has a high density

It is transparent to light

There are o free electros present in the crystal of diamond to conduct electricity.

Chromatographic technique is very useful for

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Isolation

Purification

separation

All of them

Which of the following molecules have highest bond energy

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F2

Cl2

Br2

I2

When an ionic compound is dissolved in water, it dissociate into positive and negative ions, which are surrounded by H2O molecule, This process is known as.

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Hydrolysis

Hydration

Saturation

solvolysis

The nature of positive rays depends on

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The nature of electrode.

The nature of discharge tube

The nature of residual gas

All of the above

Which gas act as 'Blistering agent'

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Acetylene

Phosphine

Phosgene

Mustard gas

Catalyst used in thermal cracking

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Platinum

Nichel

Al2O3 and SiO2

Fe2O3 and CuO

Paraldehyde is polymer of.

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HCHO

CH3CHO

CH3COCH3

CH3CH2-CH2OH

Venyl acetylene combines with HCl in

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Polyacetylene

Benzene

Chloroprene

divinyl acetylene

The difference of actual and theoretical heat of hydrogenation of compound is called.

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Lattice energy

Resonance energy

Ionization energy

Enthalpy of formation

Formalin is

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10% solution of formaldehyde in water

20% solution of formaldehyde in water

40% solution of formaldehyde in water

60% solution of formaldehyde in water

Which one of the following elements commonly exhibits oxidation states of +6 and +3 in aqueous solution.

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Na

Cr

Mg

C

Which group when attached with benzene increases electron density of ring.

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-COOH

-NO

-CHO

-CH3

Mark the correct statement.

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Na+ is smaller than Na atom

Na+ is large than Na atom

Cl- is smaller than Cl atom

cl- and Cl are equal in size

Which condition are not suitable for the growth of enzymes.

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Temperature between 25 ^oC to 37 ^oC

Solution must be dilute

Environment must be aerated

Some preservative should be present in solution

The enzyme which bring about exchange of functional group between two compounds is called.

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Hydrolases

Transferase

Lyases

Ligases