Question # 1

The number of unpaired electrons in Mn²⁺is

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5

4

3

2

When potassium metal is exposed to violet light

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Ejection of electrons takes place

Ejection of some potassium atoms occurs

There is no effect

The absorption of electrons takes place

Alkyl halides in which a halogen atom is bonded to that carbon atom which directly bonded with one hydrogen atom is called

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Primary alkyl halides

Secondary alkyl halides

Tertiary alkyl halides

Quaternary alkyl halides

Cannizzaro's reaction is type of reaction:

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Self oxidation-reduction reaction

Disproportion reaction

Addition

A and B

Which of the following is a thermosetting plastic

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PVC

Polyethylene

Polystyrene

Melamines

Which of the following derivative cannot be prepared directly from acetic acid?

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Acetamide

Acetyl chloride

Ethyl acetate

Acetic acid

Benzene does not undergo

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Substitution reaction

Addition reaction

Oxidation reaction

Elimination reaction

A certain current liberate 0.5 g of hydrogen in 2 h. How many grams of copper can be liberated by the same time in a copper sulphate solution?

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12.7 gm

15.9 gm

31.8 gm

63.5 gm

Which gas is used for welding purposes

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Butane

Nitrogen

Methane

Acetylene

A bond between two atoms may be obtained by sharing of electrons such a bond is called

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An ionic bond

A coordinate bond

A dative bond

A covalent bond

What element is not essential the growth of plants and is not required in the fertilizers

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Nitrogen

Potassium

Phosphorus

Barium

The fractions obtained from fractional distillation of petroleum are placed in increasing order of their boiling points. Which order is correct

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Natural gas, petroleum ether, gasoline kerosene

Petroleum ether, kerosene, natural gas, petroleum ether

Gasoline, kerosene, natural gas, petroleum ether

Kerosene, gasoline, petroleum ether, natural gas

Reaction of acids with alcohols is also known as

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Esterification

Saponification

Alkalization

None

Which salt is used for the treatment of hyperacidity in stomach

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NaCl

KCl

NaHCO₃

Na₂CO₃

Law of mass action was given by :

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Guldberg and Waage.

Berkeley and Hartly.

Ramsay and Reyleigh.

Berthelot.

Benzene can be obtained by heating either benzoic acid with X or phenol with Y. X and Y are respectively

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Zinc dust and soda lime

Soda time and zinc dust

Zinc dust and sodium hydroxide

Soda lime and copper

E.D.T.A is

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Mono-dentate

Bi-dentate

Polydentate

Having three lone pairs of electrons

Which of the following may affect the rate constant (k) fro a reaction :

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Change in concentration.

Change in pressure.

Change in pH.

Change in temperature.

Glucose in the presence of zymase is converted into

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Alcohol

Acid

Ethyl alcohol

Ketone

Transition metals mostly are

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Diamagnetic

Paramagnetic

Neither diamagnetic nor paramagnetic

Both diamagnetic and paramagnetic

A compound possessingα-hydrogen atom, in the presence of dilute alkali formsβ-hydroxy aldehyde. This product on heating with dilute acid forms an unsaturated crotonaldehyde. The compound is

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CH₃CHO

CH₃CH₂CHO

CH₂= CH - CHO

HC = C - CHO

Lithium reacts with air to form

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Peroxide

Normal oxide

Superoxide

None of these

A fibre which is made from acrylonitrile as monomer

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PVC

Rayon fibre

Acrylic fibre

Polyester fibre

Benzene is obtained from benzene sulphonic acid by treating with

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HCl

NaOH

H₂O

NaHCO₃

Which of the following aqueous solutions have the lowest freezing point

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5.85% NaCI

6% urea

34.2 sucrose

All of them have same freezing points

The organic compound, alcohols are much closer to, in structure and hence is also called its derivative:

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Water

Oxidizes of lithium oxides

Oxidizes of magnesium

Oxidizes of aluminium

Carboxylic acid can generally be prepared by various methods. Which of the following methods is not suitable for making carboxylic acids

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By the oxidation of primary alcohols

By the hydrolysis of nitriles

By the carbonation of Grignard, reagent

By the hydrolysis of p-amines

All reactions occur in :

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A single step.

A series of steps

Two steps.

Both (a) and (b)

A nucleophilic reagent will readily Attack

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Ethylene

Ethanal

Ethanol

Ethylamine

Copper oxide is dedected by borax bead test with colour:

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Blue

Red

Yellow

Black

A reaction is reversible because :

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Products are stable.

Reactants are reactive.

Products are reactive.

Reactants re stable.

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