Question # 1

For the representative elements from left to right across a period in the periodic table, the electron effinity of the atom generally

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Increases

Remains constant

Decreases

Not clear

Which of the following has ester linkage?

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Nylon

Bakelite

Terylene

PVC

Which of the following polymers is used for weather resistant paints

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Arcylic resins

Polyvinyl acetate

Polystyrene

PVC

Bond angle is minimum for

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H₂O

H₂S

H₂Se

H₂Te

Solvent extraction is an unstable, Process and it is called by:

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The amount of solute

Distribution law

The amount of solvent used

Law of mass action

Closed chain compound can be classified into

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Homocyclic

Hetrocyclic

Aliphatic

Both a and b

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Which of the following is complex?

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CaSO₄. 0.5H₂O

(C₆H₁₀O₅)_n

C₆H₁₂O₆

CH₄

A reaction is reversible because :

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Products are stable.

Reactants are reactive.

Products are reactive.

Reactants re stable.

If the value of azimuthal quantum number is 3, then values of m the magnetic quantum no. will be

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0, 1, 2, 3

+3, +2, +1, -1, -2, -3

0, -1, -2 ,-3

-3, 0, +3

The bond order of individual C - C bond is benzene is

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One

Two

Between one and two

One and two alternately

Acetamides are formed by the reaction of carboxylic acids with

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Acids

Bases

Salts

NH₃

Iodoform test is given by:

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Formaldehyde and Higher ketones

Formaldehyde

Acetaldehyde and methyl ketones

Acetaldehyde

Which of the following elements is not present abundantly in earth's crust?

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Silicon

Aluminium

Sodium

Oxygen

Monosaccharides are

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Aldoses

Ketoses

Either a and b

None of these

When of the following is isolelectronic with krypton

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Ca⁺⁺

Al⁺⁺⁺

Br^-1

I^-1

All the elements belongs to the 2nd period are

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Normal elements

Transition elements

Stable elements

Halogens

The total number of orbitals possible for the quantum number n is

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n

n²

2n

2n²

A carboxylic acid contains:

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A hydroxyl group

A carboxyl group

A hydroxyle & carboxyl group

A carboxyl &aldehyde group

Gooch crucible is made of:

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Brass

Porcelain

Bronze

.Gold

Energy can neither be created nor destroyed, although it can be transformed from one form to another. This is a statement of

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Law of conservation of matter

Law of definite proportions

Law of conservation of energy

None of these

Two different hydrocarbon each contain the same percentage by mass of hydrogen. It follows that they have the same

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Empirical formula

Number of atoms in a molecules

Number of isomers

Relative molecular mass

Ethylene can be prepared in the laboratory by heating together ethyl alcohol and

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HCI

Phenol

HF

H₂SO₄

The percentage of methane in natural gas is

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50%

60%

85%

90%

Bell metal is an alloy of Sn and

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Copper

Iron

Zinc

Magnesium

Which of the following does give violet colour with neutral ferric chloride?

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Acetic acid

Salicaylic acid

Formine acid

Benzoic acid

Increasing skin cancer and high mutation rate are due to

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Acid rain

Ozone depletion

CO pollution

CO₂Pollution

Which of the following element is most reactive

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Li

Na

K

Cs

On passing HCI gas through a saturated solution of commercial sodium chloride, pure crystals of NaCI are precipitated due to

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Increase in pH of the solution

Decrease in pH of the solution

Common ion effect

Increase in ionization of NaCl

Acidic hydrolysis of acetamide gives

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Acetaldehyde

Acetic acid

Methyl amine

Formic acid

Which is a good nucleophile?

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F^-1

Cl^-1

Be^-1

I^-1

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