Question # 1

The element with the highest first ionization potential is.

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Boron

Carbon

Nitrogen

Oxygen

Helium contents in the atmosphere by volume.

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0.0005%

0.0015%

0.0001%

0.00001%

HCIO2 gives the structure of a.

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Linear

Angular

trigonal pyramidal

Tetra hddral

Drying agent which react with CO2 and removes water vapours is.

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CaO

CaCl2

CaCO3

Ca(NO3)2

Which of the following is not a characteristic of dye.

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It must have suitable colour

It must be able to fix to fibre

It must be fast to wash and lights

It must be highly soluble in water

The electrophile in the sulphonation of benzene is.

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SO3

SO3H

HSO4

SO2

Which of the following statement is not related with environmental pollution.

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Direct or indirect change in any component of the biosphere

Undesirable change in the physical characteristics of the air

Undesirables change in the biological characteristics of the soil

not affecting adversely the industrial progress

What is called black gold.

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Petroleum

Coal

Coal tar

Natural gas

The hybridization of sulphur in sulphur dioxide is.

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sp

sp2

sp3

dsp2

The chief ore of aluminium is.

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Cryolite

Bauxite

Kaolin

Carnalite

Select an acidic amino acid

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Lysine

Cystine

Aspartic acid

Aminoacetic acid

Proteins have characteristics

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Melting poirn t

Iso electric point

Boiling point

All of these

Which of the following carbides reacts with H2O to form propane.

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Al4C3

CaC2

SiC2

Sic

Greeks and Romans had used nanoparticles in the manufacture of.

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Cosmetics for eyes

Medicines

Metals

Hair -dye

Magnesium burns in air to give.

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MgO

MgCO3

Mg3N2

Both A and C

Which of the following statements is not relevant to the Plank's quantum Theory.

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Radiant energy is not absorbed or emitted continuously

Radiant energy is emitted or absorbed in the form of small packets of energy.

The quantum oflight energy is called photon

The energy associated with photon of radiation is directly proportional to the wavelength.

Most effective pesticide is

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Carbonates

Organophosphates

Organ chlorines

All of these

The emission of light characteristics of metal and correlation of intensity of the light emitted with concentration of that metal forms the basis of.

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Roman spectroscopy

IR spectroscopy

Flame photometry

Rotational spectroscopy

SO2 acts as

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Lewis base

Lewis acid

Botha A and B

None of above

Elements of group 14 have the electronic configuration of their outer shell as

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ns2 np3

ns2 np2

ns2 np6

ns2

A drop of a liquid acquires spherical shape because of.

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Its viscous nature

Capillary action

The tendency to acquire minimum surface are

Its shape

The blue colour of CuSO4 disappears on adding Zn granules to it . it is because of .

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Oxidation of Cu atom

Oxidation of Zn²⁺

Oxidation Cu²⁺

Oxidation of Zn²⁺

The temperature of which the compound melts into a liquid to the same composition as the solid is called the

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Congruent melting point

Incongruent melting point

Peritectic temperatures

Metastable point

In a one -component system the maximum number of phase that can consist in equilibrium is.

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1

2

3

4

Particulate from soil and mineral primarily contains

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Sodium compounds

Calcium compounds

Silicon compounds

Calcium, aluminum and silicon compounds

The large increase in the rate of a reaction on rise in temperature is due to.

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The lowering of activation energy

The decreases in mean free path

The increase in collision frequency

The increase in the number of molecules having more than the threshold energy

What is the purpose of molybdenum in steel alloying.

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To increase dynamic and high temperature strength and hardness

To increase brittleness

To increase corrosion and resistance

All above

Which of the following statements is not related with flame photometric analysis.

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Vaporization of the solvent leaving back the residue

Conversion of solid slat to the gaseous state

Dissociation of gaseous molecules into free atoms

Measurement of the intensity of absorbed tradition

Carbohydrates are characterized by the presence of.

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Hydroxyl group

Carbony group

Asymmetric carbon

All of these

The following statements are true except one which one.

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Carburizing does not harden a steel

Flame and induction hardening require the use of hard enable steels.

Quench –hardened steel does not require tempering to present brittleness

None of these

The role of the mineral cryolite Na2AlF6 in the Hall process for aluminum production is.

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It is the source of aluminum

it is a chemical reducing agent

It forms a slag to remove impuriteis

In the molten state, it is a solvent for alumina Al2O3

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