Question # 1

Chemical like Al₂(SO₄) or alum are used in purification of water druing step:

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aeration

coagulation

chlorination

treatment

Coagulation in the purification of water is carried out by

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Alum

NiSO₄

BaSO₄

CuSO₄

A chemist says that glass must be a super cooled liquid. the reason that he might have in his mind is that glass has:

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Definite shape

Definite volume

Crystalline structure

No crystalline structure

During an exothermic or endothermic reaction which one of the following formula is used to calculate the amount of heat evolved or absorbed

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ΔΗ = ΔΕ+PV

∆E= q+w

Δp =ΔΗ

q = m x s x ∆T

Evaporation occurs at all temperatures and is effected by

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surface area

temperature

intermolecular forces

all of these

Aldehydes are easily oxidized to corresponding carboxylic acids in the presence of:

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Strong oxidizing agents

Highly strong oxidizing agents

Tollen's reagent

Tollen's reagent and Fehling solution

Which one of the following is an organic compound?

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Calcium carbide

Calcium cyanide

Carbon disulphide

None of these

H3O+ can't accept a Ip because

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it has positive charge

The central atom is not electron deficient

The shell of oxygen has reached its limit

it already has a coordinate bond

Theoretically, the temperature at which volume of gas become equal to zero is called

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Boiling point of water

Zero absolute

Zero Kelvin

both B and C

d-d transition cannot be shows by

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Cu+1

Sc+3

Zn+2

All

Glycerine is a polar compound. It boils at 290°C under one atmospheric pressure. It should be distilled under reduced pressure due to reason that

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there are strong intermolecular forces between molecules of glycerine

it decomposes at 290°C

low pressure makes the liquid to boil at high temperature

the reduced pressure decreases the boiing point of liquids

Which property is not present in Al?

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Reacts with acid

Reacts with bases

Changes litmus paper

Changes methyle orange colour

Carboxylic acids react with acids releasing gas from it:

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H2O as steam

CO

CO2

O2

Substituted phenyl groups are called

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acyl groups

phenyl groups

Aryl groups

Alkyle groups

Treatment of a secondary alcohol with a suitable oxidizing agent (K₂Cr₂O₇) results in the formation of

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Ketone

Aidehyde

Ether

Alkyl halide

[Zn(NH₃)₄]³⁺possess geometry

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Square plannar

Hexagonal

Tetrahedral

None of these

In fructose the possible optical isomers are

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12

8

16

4

Organic compounds containing halogen atom are called:

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R---OH

R----X

R----NH₂

R----COH

What is the formula of asbestos?

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CaMg₃(SiO₃)₄

CaSiO₃

Na₂SiO₃

Mg₃H₂(SiO₃)₄

Which of these polymers is a synthetic polymer

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Animal fat

Starch

Cellulose

Polyester

IIB elements (Zn, Cd, Hg) and III B elements (Sc, Y and La) are

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Non typical transition element

Typical transition element

Normal elements

Inner transition element

Solvent extraction is an equilibrium process and it is controlled by :

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law of mass action.

the amount of solvent used.

distribution law.

the amount of solute.

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