Question # 1

The property measured in DTA is

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Heat effects

Weight loss

Rate of change in weight

Change in temperature

Photochemical among is related to pollution of

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Air

Water

Soil

All of the above

The range of sound pressure for uncomfortable level is.

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80 - 90 dB

100 - 120 dB

130-140 dB

All above

The suffix "ate" at the end of the name of the compiled signifies that it is.

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Cation

Anion

Neutral

None of above

XeF4 is obtained, when a mixture of Xenon and fluorine in the ratio is heated in a nickle vessel at 400 ^oC

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1 : 3

5 :1

1 :20

1 :5

Select the major product obtained from the addition of HBr to I -Methyl cyclohexene

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1-bromo -2- methyl cyclohexane

6- bromo-i- methyl cyclohex -i- ene

3- bromo -1- methyl cyclohex - 1- ene

I-bromo -I- methyl cyclohexane

What prefix in steel identification means composition varies from normal limits.

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E

B

X

F

To increase the life of filament and to low the heat conductivity a mixture in filled in electric bulb.

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Ar & N2

Ar & Kr

Kr & N2

Xe & N2

All steroids on heating wish solenium give

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phenanthrene

Cholesterol

Diels hydrocarbon

Isoprene

Which of the following is NOT a hardware requirement for die casting.

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Water cooled metal cavities

Machined metal holding blocks

Ejection mechanism

Metal mold

CCl4 has zero dipole moment because of.

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Planar structure

Tetrahedral structure

Similar size of C and Cl atoms

Similar electrons affinity of C and Cl

Gold dissolves in aqua regia forming

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AuCl

Au(NO3)3

AuCl3

HAuCl4

The pKa of acetic acid is 4.74 which implies that.

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pH of 1N solution is 4.74

At pH 4.74 the dissociation of acetic acid is maximum

At pH 4.74 half of the acetic acid molecules are dissociated in the solution.

At pH 4.74 the dissociation of acetic acid is minimum.

The reason why phenylamine is a much weaker base tahn ammonia when each is in aqueous solution to that.

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Teh ion pair of electron on two nitrogen atom of phenylamine is delocalised over the benzene ring.

The phenylamine molecule is too large to capture hydrogen ion easily

Phenylamine is much less soluble is water than is ammonia

The benzene ring has a tendency to increase the acidity of its substituents.

When some quantity of electricity is passed though two electrolytic cells. The ratio of the mass of the products obtained at the cathode is the same as the ratio of their

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Densities

Atomic masses

Equivalent masses

Atomic numbers

Which of the following salt is green in colour

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Mn salt

Cr salt

Co salt

Ba salt

The liquor is screened to exclude ________ material

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Fibrous

Polymers

Maltose

Sucrose

The acetylene molecule contain a

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Single bond

Double bond

Triple bond

Co ordinate bond

An aromatic compound has a molecules formula C7H8O. How many isomers are possible for this compound.

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3

4

5

6

The only oxidation state of alkali metals in their compounds is.

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+1

+2

-1

0

Ammonium nitrate is sold as a mixture with

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Soda Ash

Lime stone

Zinc

None of above

The pH of the 1.3 x 10^-4 NH₄Cl is

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1.3

4.0

2.886

3.886

Highly dangerous acid and produces severe wounds on the skin.

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HCIO

HCIO2

HCIO3

HCIO4

Sulphate ores of aluminium

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Alumite

Cryolite

Fekdsper

Kaolin

The IUPAC name of HCOOCH3 is.

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Methoxy methanol

Ethanoic acid

Methyl methanoate

Methoxy methane

Which of the following dye is used an antiseptic .

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Methyl orange

Mercurochrome

Alizarin

Bismarck brown

The most promising technique for solar production of electricity is.

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Dry cell

Battery

Solar cell

None of above

The name hydrogen was proposed by.

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Lavoisier

Rutherford

Henry Cavandish

Scheele

Which of the following is the most suitable catalyst for ammonia synthesis.

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Pt

ZnO+ Cr2O3

Fe in fused mixture of Al2O3 + SiO2+ MgO

All of above

Which of the following extract is used for wet tests of acid radicals.

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Calcium carbonate extract

Sodium iodide extract

Sodium carbonate extract

Ammonium carbonate extract

Which show maximum number of oxidation states in 3d series.

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Mn

Ni

Co

Zn

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