Question # 1

An example of nitro dyes is.

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Martius yellow

Auramine O

Malachite green

Methyl red

Boric acid is added to glass because is.

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Makes the glass opalescent

Reduces the coefficient of expansion

Makes the glass brittle

Increase refractive index of the glass.

In German Silver copper is alloyed with which metal.

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Zn

Ni

Ai

Zn and Ni

Cement is a mixture of

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Clay and clinker

Clay limestone and gypsum

Limestone and gypsum

Binder

Flourine differs from the other members of its own group due to.

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Its small size and low bond energy

Its higher electornegativity

None-availability of d-orbitals in its valence shell

All the above

The lowest K.E. for an electron is three dime national cubic box is given by

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h²/ 8m^a

3h² / 8 ma²

9h²/ 8ma²

16h² / 8ma²

In bi sulphate ion, the formal charge on sulphru atom is.

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+1

+2

+4

+6

Nitric acid is used in manufacturing of.

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Explosive

H2SO4

Fertilizer

All above

The number of phases of mixtures of four gases enclosed in a container is

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1

4

4-1

zero

Among the elements of third period, the element with lowest boiling point belongs to group.

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1

14

16

18

Which of the following is not biological characteristics of water.

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COD

Animals

Plants

Viruses

The deficiency of which vitamin leads to beri brainteaser

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Thiamine

Riboflavin

Pyridoxine

Asorbic acid

In the process of electrosmosis

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Colloidial particles move towards the electrodes

Both colloidal particles and dis persons medium move

Only dispersion medium moves to carry the current

Positively charged colloidal particles move, but negatively charged particles remain stationary

The penultimate shells have pscudo inert gas type configuration.

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Ga

In

TI

All above

Which of the following substance is a volatile metals.

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Lead

Zinc

Mercury

Sodium

In which polymerization branching of chain cannot be possible.

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Free radical

Cationic

Anionic

Anionic and Zieglar Natta

What is the ratio of the maximum load in a tension test to the original cross sectional area of the test bar.

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Tensile strength

Yield strength

Shear strength

Torsion

Ethylene belongs to.

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C_2v group

D_2h group

C₂ group

D_ah group

The electrophile in the sulphonation of benzene is.

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SO3

SO3H

HSO4

SO2

Which of the following statements is not related with entropy.

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It is a measure of disorder

It is a measure of unavailable energy

It is a function of thermodynamics probability

It is a path function

Hydrogen gas will not redue

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Heated cupric oxide

Headed ferric oxide

Heated stannic oxide

Heated aluminium oxide

In which pair of species, the Lewis formulae contain same number of ion pairs and bond pairs but they are not isoelectronic.

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O2, N2

SO2, O3

PCl3 , BF3

SOCl2, COCl3

An example of cyclic polyterpenoid is

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Myrcene

Alcoholic

Synthetic rubber

Natural rubber

How many varieties of commercial iron are known.

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1

2

4

3

Solid substances consist of an ordered any of ions and solid as a whole is electrically.

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Conductor

Neurtal

Acidic

Basic

Which of the following is not alloy of aluminium.

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Aluminium bronze

Magnalum

Duralumin

Stellite

Phenol on reaction with ethanoic anhydrides in the presence of sodium ethanoate gives.

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Phenyl benzoate

Ethyl benzoate

Phenyl ethanoate

Phenyl methyl ether

Which of the following has highest ionization energy.

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Oxygen

Argon

Barium

Caealum

The common oxidation state of lanthanides is.

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+3

+2

+1

+4

Which of the following statement is false about resonance.

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It increase the stability of a molecule

It leads to similar type of bonds

It increase the reactivity of the molecule

It decrease the reactivity of the molecule.

The correct order of increasing polar character is.

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H2O < NHE < H2S < HF

H2S < NH3 < H2O < HF

NHE < H2O < HF < H2O

HF < H2O < NH3 < H2S

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