Question # 1

Which of the following radical is not a member of III group

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Al³⁺

Fe²⁺

Ca²⁺

Fe³⁺

Smoke is a dispersion of

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Gas in gas

Gas in solid

Solid in gas

Liquid in gas

The dye obtained from madder root

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Indogotin

Indanthrene

Alizarin

Acriflavin

Solution with components which obeys Raoult's over the entire composition range are said to be.

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Real solution

Regular solutions

Dilute solutions

Ideal Solution

Argon is used in filling of.

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Discharge tubes

Luminous tube

Fluorescent tubes

None of above

_{Which of the following salt is soluble in water.}

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BaCO3

SrCO3

CaCO3

K2CO3

The law which relates the solubility of a gas to its pressure is called.

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Raoult's law

Nernst law

Ostwald's law

Hennery's law

Ammonia when used directly as a fertilizer is to be injected about_____ under the surface to keep it from seeping out.

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2 inches

4 inches

6 inches

10 inches

The 'shape' of molecule ." Xe F6 is.

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Pentagonal bipyramidal

Regular octahedral

Distorted octahedral

Square planar

The expected specific waste fo petroleum industry is.

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Asphalt and tars

Paper

Cloth

Fibre

The decreasing order of the second ionization energies of K, Ca and Ba is

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K > Ca > Ba

Ca > Ba > K

Ba > K > Ca

K > Ba > Ca

The half life period of any first order reaction.

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Is half the specific rate constant

Is independent of the initial concentration

Is always the same whatever the reaction

Is directly proportional to the initial concentration of the reactant

Graphite is a good conductor of electricity because is.

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Has sp2 hybridized carbon stoms

Has free electrons

Is crystalline

Has free atoms

HCIO2 gives the structure of a.

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Linear

Angular

trigonal pyramidal

Tetra hddral

Which of the following statements is incorrect.

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The elements of group 18 are known as aerogens.

Group 2 elements are all metals

Metallic character increase on going down a group

All the elements belonging to a particular period have same valence shell configuration.

If Principal quantum number n = 4 the quantum number l can have calue.

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1,2,3 and 4

0,1,2 and 3

1,2 and 3 only

None of the abvoe

Cement containing higher percentage of gypsum than required.

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Sets slowly

Sets repidly

_{Does not set at all}

Has no effect

Which of the following biogeochemical cycle is not component of ecosystem.

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Carbon cycle

Potassium cycle

Oxygen cycle

Nitrogen cycle

Which of the following elements has the highest third ionization energy.

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Sodium

Magnesium

Aluminum

Silicon

Which of the following does NOT react with sodium hydroxide solution.

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Fat

Vinegar

Ethanol

Water

Which of the following techniques are used for minimizing water pollution.

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Stabilization of ecosystem

Recharge of the waste

Waste treatment

All above

The Lewis formula of SOCl2, the total number of bond pairs and lone pairs of electron around sulphur are.

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2 ,1

2,2

3,1

3,0

Example of inter molecular H-bonding is

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NH3 and H2O

HF

CH3COOH

All of abvoe

The prefiex 'nano' comes from a

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French word meaning billion

Greek word meaning dwarf

Latin word meaning invisible

Spanish word meaning particle

Pick out the incorrect statement for CIF3

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It has trigonal planar geometry

It is used to make gaseous UF6 which is useful in making enriched U-235 fuel

It is used as powerful fluorinating agent for inorganic compounds

CIF2 has been used as fuel in short range rockets reating with hydrazine.

Carbon in wrought iron is present as

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Silicon carbide

Iron carbide or comentite

Graphite

Partly as iron carbide and partly as graphite

Carbon dioxide content in atmosphere is

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0.0034%

0.034 %

0.34 %

3.4 %

A pH of a neutral solution at 100 ^oC when Kw = 1.0 x 10^-12

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0

7

6

7

Sodium reacts with excess of oxygen to form

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Na2O

NaO2

Na2O2

NaO

Which of the following statement is not true with respect to photo chemical reactions.

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These take place in the presence of light

Free energy of these reactions may be positive or negative

Light intensity affect these reactions

Temperature has significant affect n rate of these reactions

Example of peseudohalonge group.

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Cyanogen

Thiocyanogen

Selenocyanogen

All above

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