Question # 1

A type of a chemical bond which is formed by the mutual sharing of electrons between combining atoms of the same or different elements is called.

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Ionic bond

Covalent bond

Co ordinate Covalent bond

Metallic bond

The forces which holds the atoms together in a molecule is called

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Ionic bond

Covalent bond

Co ordinate bond

Chemical bond

Which of the following is the active ingredient in ordinary household bleach.

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HCl

Cl2

NaCl

NaCIO

Select a basic amino acid.

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Glycine

Cystine

Alanine

Lysine

The first step of formation of sugar is

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Extraction

Washing

Cutting

Clarifying

Xenon diflouride is obtained by irradiating a mixture of xenon and fluorine with light from a high pressure.

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Mercury arc

Tungeston arc

Xenon arc

None of above

Isotopes are atoms whom nuclei have the same atomic number but different mass numbers. A specific isotope has an atomic number of 18 and a mass number of 35. How many electrons are there in the neutral atom.

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17

18

34

35

Which of the following statement is not correct with respect to electrometric effect.

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It is permanent effect

It is brought into play instantaneously at the demand of attacking reagent

It proceeds a polar addition reaction

The original electronic condition is restored after the removal of tacking regent.

The halide which is inert to water is

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PCl5

SiCl4

BCl3

SF3

Nitric acid is used in the manufacturing of.

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Dyes

Drugs

Artificial silk

All above

In hydrogen bonding a hydrogen atom is bonded to which of the highly electronegative atoms.

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N

O

F

N,O,F

According to systematic nomenclature which hydrogen compound is sulphane.

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HF

Si H4

SF4

H2S

At extremely low pressures, the van der Waals equations for one mole may be written as.

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PV = RT + Pb

PV = RT

PV = RT - a/V

(P +a) (V-b) = RT

In the fourth flotation process for the purification of ores, the ore particles floats because.

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They are light

Their surface is not easily wetted by water

They bear electrostatic charge

They are insoluble

Four elements A, B,C,D have atomic numbers Z , 1 ,Z, Z +1 and Z +2 Respectively If Z is 9, then bond between which pair of elements will be ionic.

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A and C

D and C

D and B

B and C

Which of the following should have the largest dipole moment.

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Carbon tetrachloride

Cis-stibeue

Trans-atibeue

Cis-dichlorocthylene

Which of the following acid radical give organic layer test.

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Cl-

CO3

I

S^2-

Red brass contain about how many percent of zinc.

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20 %

15 %

30 %

25 %

The common host compound for the formation of inclusion compound is.

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Urea

Thiourea

Cholic acid

All above

Which of the following statement is not true with respect to electrode potential.

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Feasibility of a chemicals reaction

Rate of chemical reaction

Nature of a chemical reaction

Free energy of a chemical reaction

Burning of fossil fuels is the main sources of which of the following pollutant.

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Nitrogen oxide

Nitric oxide

Nitrous oxide

Sulphur dioxide

Which isotope of hydrogen is radioactive in nature.

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Protium and deuterium

Tritium only

Tritium and deuterium

Only deuterium

Pick out the incorrect statement.

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Red phosphorus consists of a complied chain structure and black phosphorus has a layer structure.

Nitrogen shows a little tendency for catenation, because N-N a single bond is very strong.

The xamimum number of covalent bonds formed by nitrogen is four, since it has no d-orbitals in its valence shell

The group 15 elements do not form M5+ ions, but +5 oxidatin state is realized only through covalent bonding.

According to SHAH concept the Lewis bases were classified on the basis os.

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Charge ion size

Polarization consideration

Electron and co coordinating ability

All of above

Which of the following is not a property of Cr.

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it is brilliant silvery metal

it is malleable

It can take very high polish

Its surface is tarnished easily

Given A + 3B ____________ 2C + D

This reaction is first under with respect to reactant A and second order with respect to reactant B . If the concentration of A is doubled and the concentration of B is halved, the rate of the reaction would _____ by factor of _____________

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Increase ,2

Decrease ,2

Increase ,4

Decrease ,4

Commercial incinerators produce.

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Smoke

CO

NOx

All above

Which of the following process is used for the removal of particulates.

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Wet removal by precipitation

Sedimentation

Diffusion and impaction

All above

Classical smog occurs in place of.

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Excess concentration of SO2

Low temperature

High temperature

Excess concentration of ammonia

A catalyst

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Actually participates in the reaction

Changes the equilibrium concentration of the products

Does not affect a reaction energy path

Always decreases the rate for a reaction

The pH of the 1.3 x 10^-4 NH₄Cl is

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1.3

4.0

2.886

3.886

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