Question # 1

The enzymes that bring about exchange of functional groups like phosphate are called

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Ligases

Lyases

Isomerases

Transferases

Which of the following is thermosetting polymer

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Synthetic varnishes

Epoxy resins

PVC

Both A and B

Which of the following has isomorphous structure

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NaF

S

Sn

N

Alcohol is less acidie than phenol due to

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higher ka value

Instability of alkoxide ion

stability of carbocation

Stability of phenol

How many zones through which the charge passes in a rotary kiln?

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4

3

2

5

Fungicides are the pesticides which

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Kill plants

Kill herbs

Kill insects

Control the growth of fungus

An example of simple protein is

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lipoprotein

Cholesterol

lecithin

globulin

Butane molecule can have maximum no of isomers

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2

5

4

3

Acetic acid reacts with thionyl chloride to form acetyl chloride, which species acts as nucleophile in the reaction

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SO3

SO2

Cl-

No nucleophile is formed

Arginine, lysine and ornithine are

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Obtained by hydrolysis of proteins

Essential amino acids

Basic amino acids

Derived from butyric acid

Nihydrin reacts with amino acid to give product of

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Bluish color

Violet color

Bluish violet color

No color

The metal present in blood is

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Al

Hg

Cu

Fe

In sixth period 14 of its transition elements are called

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Lanthanides

Actinides

Radioactive elements

None

When a weak acid is dissolved in water or a weak base dissolved in water, then in both cases the conjugate acid base pair is produced. The ionization constants K_aand K_bof a pair are related with each other as

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K_a= K_b

K_a. K_b= K_w

K_a. K_w= K_b

K_b. K_w= K_a

Ethanol containing some methanol is called

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Absolute spirit

Rectified spirit

Power alcohol

Methylated spirit

The substances which soften the polymer are called

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Stabilizers

Plasticizers

Retarders

Pigments

Selection of filter paper depends upon sizes of particles to be :

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Tested.

Filtered.

Checked.

All of above.

Drained sewage has B.O.D

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More than that of water

Less than that of water

Equal to that of water

None of the above

What mass of NaOH is required to prepare 2.5 dm³of 1.5 M NaOH solution

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130 g

140 g

150 g

160 g

In a reversible reaction, two substances are in equilibrium. If the concentration of each one is reduced to half, the equilibrium constant will be

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Reduced to half of its original value

Doubled

Same

Reduced to one fourth its original value

A beaker contains 9 grams of water. The number of H-atoms is

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6.02 x 1023

3.01 x 1023

6.02 x 1024

3.01 x 1024

The number of unpaired electrons in Fe³⁺(Z = 26) are

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5

6

3

4

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