Question # 1

Elements of group IA and IIA are

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electronegative

neutral

electropositive

non-metals

All are examples of different classes of enzymes except

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Hydrolases

Isomerases

Oxido-reductases

Mutases

The electrochemical reactions occurring at both the electrodes along with the electrolytic conduction constitute

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Oxidation

reduction

Redox reaction

electrolysis

Which one of the following groups is indicated when HCI is formed by reaction of ethanol with phosphorous pentachloride?

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Amino group

Halide group

Hydroxyl group

Hydride group

Polymerization process was classified in

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1926

1927

1929

1931

The partial pressure of gas can be calculated if we know total pressure of mixture and:

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Number of protons

Number of electrons

Number of neutrons

Mole fraction of gases

Formation of PVC form vinyl chloride is an example of

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substitution reaction

addition polymerization

condensational reaction

Aldol condensation

Select the name of ready plant from which word ''Paper'' is derived:

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sun flower

papyrus

water hyacinth

rose

The compound that has zero dipole moment is

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HCl

H₂S

NH₃

CH₄

The scale of temperature that shows the freezing point of water at 0° is called

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Fahrenheit

Kelvin

absolute

Celsius

Halogens form halogen acids. HF is the weakest among all of them This is due to the reason that

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fluorine is a very small-sized atom

fluorine is highly electronegative atom

there is strong hydrogen bonding in HF

the polarity of HF bond is less

Which of these reactions is shown by buranone, CH₃COCH₂CH₃

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On warming with acidified potassium dichromative (IV) the solution turns green

On heating with Fehling's reagent a red precipitate is formed

With 2,4-dinitrophenlhydrazine reagent an orange precipitate is formed

With hydrogen cyanide an aldehyde is formed

Number of neutrons in heavy hydrogen atom is

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0

1

2

3

From the following values of dissociation constants of four acids which value represents the strongest acid?

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2 x 10^-2

0.02 x 10^-1

3 x 10^-4

2 x 10^-4

What are alloys

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A homogenous mixture of two or more elements

A homohenous mixture of metal and a non-metal

A homogenous mixture of two or more metals

None of the above

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

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H2SO4

HSO4

SO3

SO^-₂

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Which of the following contains single bonds

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Benzene

Alkyne

Alkene

Alkane

Which step is unnecessary for purification of water for drinking purposes

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Aeration

Coagulation

Treatment with chlorine

Treatment with iodine

Benzene hexachloride is used as

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Dye

Antimaterial drug

Antibiotic

Insecticide

If heat absorbed in the reaction, the process is said to be

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Exothermic

Isothermal

Adiabatic

Endothermic

Almost forward reaction is complete when value of k_{c :}

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Neither larger nor very small.

Very small.

Very large.

Negligible.

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