Question # 1

Which of the following statements is worng.

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Covalent compounds are generally soluble is polar solvents

Covalent compounds have low melting and boiling point.

Ionic solids do not conduct electricity is solid state

Ionic compounds conduct electricity in the fused state.

The IUPAC name of C2H3, CO , OC OC2H5 in

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Prepanoic anhydride

Ethanoic anhydride

Diketoethoxy ether

None of the above

Which of the following compound does not following octet rule.

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CS2

PBr3

IBr

Br F3

The number 7.65 is rounded to.

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7.6

7.7

7.5

7.8

Sea water is converted into fresh water bases upon the phenomenon of.

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Plasmolysis

Sedimentation

Diffusion

Osmosis

Reverse osmosis

The most stable carbonium ion is

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See butyl

n-butyl

Tert butyl

None of the above

Chlorine when attached to benzene has

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+1 and + R effect

-1 and - R effect

-1 and +R effect

None of the above

What is called black gold.

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Petroleum

Coal

Coal tar

Natural gas

In order to understand the nature of H , bond the theory has been suggested.

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Electrostatic approach

Molecular orbital approach

Valance bond approach

All the above approaches

The base which in not present in DNA is

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Adenine

Guanine

Thymine

Cytosine

Which of the following substance is a volatile metals.

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Lead

Zinc

Mercury

Sodium

The movement of an electric charge produce a magnetic field is known from the

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Elementary Physics

Elementary Chemistry

Both A and B

None of above

The property associated in thermometric tittration is

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Change in weight

Rate of change in weight

Heat evolved or absorbed

Change in temperature

Among the elements A, B,C and D having atomic numbers 7,8,9 AND 12 Respectively, the element with smallest size and highest IE is.

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A

B

C

D

In a system of designating wrought aluminum alloys a sour digit number is used what does the first digit indicate.

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The purity of aluminum

The identity of the alloy

The alloy group

All of above

The efficiency of a reversible heat engine depends only on the

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Temperature of the heat sink

Temperature of the heat source

Temperature of the heat source and sink

Pressure of the fluid

What refers to the tin mill steel, without a coating.

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White plate

Black plate

Tin steel free

Dichromate tin

Indicate false statement about stainless steel

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The density of stainless steel is about the same as carbon or low alloy steels

Stainless steels are poor conductors of heat

Stainless steels are poor conductors of electricity

Stainless steels have tensile moduli greater than those of carbon and alloy steels.

The main active contaminants of nuclear reactors are.

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Co- 60

Mn -54

Sr-60

All above

The bonding of transition metal complex was not well understand until the pioneer work of.

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Ps JAISWAL

GS MANKU

BR thukral

Alfred Weriner

In a standard Weaton cell the cathode is

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Cadmium amalgam

Mercury

Platinum

Carbon

Group IV A consist of elements.

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3

4

5

6

In reverse phase chromatography which of the analyte will be eluted more readily.

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Polar

Non polar

Semi polar

All above

The important condition for the formation of chemical bond is that.

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Their electron clouds should not diffuse

Both atoms should have high electron affinites.

Both atoms should have same electronegativities

The process should be accompanied by the lowering in potential energy.

Which of the following hydroxides has the maximum solubility in water.

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Mg (OH)2

Ca (OH)2

Sr (OH)2

Ba (OH)2

Ozone layer of stratosphere requires protection from indiscriminate use of.

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Fungicides, insecticides, bactericides and medicines

Aerosols and high flying jets

Atomic explosions and industrial wastes

Weather ballons

Nanoscience can be studied with the help of

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Quantum mechanics

Newtonain mechanics

Macro dynamics

Grophysics

Which of of the following statement is not correct in respect of

Arrhenius concept.

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This concept is applicable only for aqueous systems.

Neutralization takes place in aqueous medium only

H+ ion concept remain as such in water

This concept is applicable for non aqueous system only.

Borax exist in the form

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Ordinary borax

Octahdral borax

Borax glass

All above

Refining is

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Extracting petroleum gas

Separation of various fraction

Heating of coal

All of above

Iodination of benzene takes place in the presence of iodine and

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HNO3

HIO3

HgO

All of these

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