Question # 1

What is use of the addition of brine solution in the production of soap from castor oil and sodium hydroxide.

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To speed up the reaction

To lower the solubility of soap

To remove unreacted castor oil and sodium hydroxide

To increase the purity of the soap obtained.

The law of triads is applicable to

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Lithium, beryllium, boron

Fluorine, chlorine, bromine

Chlorine, bromine, iodine

Sodium, potassium, Rubidium

Which of the following statement is not true in case of catalytic reforming.

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High temperature results in loss of reformate yield

High naphthenic stock require high space velocity

Presence of water decrease the hydrocracking activity.

None of above

Which is major component of Bordeaux mixture.

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Copper sulphate

Sodium chloride

Calcium chloride

Magnesium sulphate

Atomic volume of C, N, O and F are in the order

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C > N > F > O

C > N > O > F

F > O > N >C

N > C > O >F

Metal are

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Hard

Ductile

Malleable

All

Which of the following elements has the highest value of IE.

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Na

K

Mg

Ca

Which of the following element is usually determined by flame photometry.

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Li

Na

K

All above elements

Al2Cl6 is an example of

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Ionic bond

Covalent bond

Co ordinate bond

Metallic bond

Which of the following device is used to measure the surface tension.

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Polarimeter

Viscometer

Refractometer

Stalagnameter

Which of the following statement is not relevant with nitrous oxide.

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It is a colorless and odourless gas

It is non toxic gas

It is present in the atmosphere in higher concentration

It has high reactivity in the lower atmosphere

Which of the following statements is not correct with respect to limitations of flame photometry.

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Low energy of the exciting source

Liquid samples are generally used

Can be employed for direct detection halides or inert gases

It does not provide informatin about the molecular forms of metals.

Pick out the ideal conditions needed for the manufacture of H2SO4 by contact process.

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Low temperature high pressure and high concentration of reactants

Low temperature , low concentration of reactants and low pressure

High temperature high pressure and high concentration of reactants

Low temperature, low pressure and high concentration of reactants.

Conductometry is based on

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Electric current

Electrical potential

Absorbance

Electrical conductance

Pig iron is also called.

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Cast iron

Steel

Wrought iron

Stainless steel

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.

Among alkali metals, the least metallic element is.

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Li

Na

Rb

Cs

Which among the following hydride is ionic in nature.

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Ammonia

Protium oxide

Calcium hydride

Sulphane

Which one of the following is natural polymer.

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Starch

Nylon-6

Neoprene

Buna-S, SBR

When fullerencs were discovered they were thought to be

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First example of spherical aromatic molecule

First example of spherical non aromatic molecule

First example of diamond lime molecule

None of the above

Pyrolysis gasoline is obtained from.

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Catalytic cracking

Gasification

Steam cracking

Reforming

Which of the following method is used to separate small molecules form the larges molecules from the larger molecules in diffusing through a membrane.

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Dialysis

HPLC

FPLC

TLC

Pick out incorrect statemtn about K2r2O7

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It oxidizes acidified solution of H2S to S

It oxidizes Ki TO i2

It oxidizes HCl to Cl2

It gives oxygen, when treated with cold conc. H2SO4

The SI unit of pressure is Pascal it is define da sa force per unit are of 1N/m2 one atmosphere of pressure is equal to.

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760 mm of Hg

1 bar

101 k Pa

760 torr

All are correct

The temperature at which two conjugate solutions change into one homogeneous solution is called.

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Azeotrope

Conjugate temperature

Consolute temperature

Transition temperature

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

In the kinetic study of a reaction A _____________ products.

A straight line was observed when a graph between time and 1/C2 was plotted. the reaction is.

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Second order

First order

Third order

Zero order

Which of the ionic possesses highest bond energy.

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C-C

Si -Si

Ge - Ge

Sn -Sn

Which of the following source is commonly used as excitation source in fluorimeter.

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Tungsten lamp

Mercury vapour lamp

Nernst vapur lamp

Radio souse

Which of the following functional groups is not involved in ion exchange chromatography.

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Weak acids

Strong acids

Strong bases

Carbohydrates

In each period the most electro negative element belongs to.

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^{Group -1}

Group -17

Group -2

Group -18

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