Question # 1

According to the VSEPR theory, the shape of the SO3 molecule is.

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Pyramidal

Tetrahedral

Trigonal planar

Distorted totrahedron

1-Butyne on oxymereuration -demercuration would give.

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Butanone

Butanal

Propanol and methanol

Propanoic acid and formic acid

Inter halogens are of types.

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3

4

5

6

The equilibrium constants Kp and Kc are related as

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Kp = Kx Pdelta n

K p= Ks/P delta n

Ks = Kp (RT)delta n

Kx = Kp (P/RT) delta n

Which of the following methods is used in qualitativ eanalysis.

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Physical method

Chemical method

Instrumental method

All above

Among the unit cells given below, which has the highest symmetry

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Monoclinic

Cubic

Hexagonal

Orthorhombic

What impurity in steel can cause ted shortness which means the steel becomes unworkable at high temperature.

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Sulphur

Silicon

Magnesium

Aluminium

The main constituents of ___________ are boron oxide and silica.

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Pyrex glass

Low silica glass

Soda lime glass

Super hard glass

Magnesium burns in air to give.

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MgO

MgCO3

Mg3N2

Both A and C

The stationary and mobile phases in paper chromatography are.

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^{Liquid/Liquid}

Solid /Liquid

Liquid/Solid

Gas/solid

Ozone depletion in stratosphere will result in

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Forest fires

Increased incidence of skin cancer

Global warming

None of the above

The electrophile in the sulphonation of benzene is.

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SO3

SO3H

HSO4

SO2

In average composition of a good sample of cement the percentage of silica is.

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18.5%

20.5%

22.5%

24.5%

Ozone layer of upper atmosphere is being destroyed by

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chlorofluorocarbons

SO2

Photochemical oxidants O2 and CO2

Smog

What is the effect of aluminum in cast iron.

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To increase hardness above 0.5 %

To deoxidize molten cast iron

To affect machinability, ductility and shrinkage depending on form

Both A and B

Which of the following is not a property of Ni.

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it is a soft silvery white metal

It is malleable and ductile

It is highly magnetic

It has high electrical and thermal conductivities

30 mL of an acid solution is neutralized by 15 mL of 0.2 N base. The strength of acid solution is.

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0.1 N

0.15 N

0.3 N

0.4 N

1 nanometre =___________ cm

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10^-9

10^-8

10^-7

10^-6

Aluminum is usually extracted from

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Bauxite

Corundum

Feldepar

Alumite

A molecule is said to be chiral

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If it contains plane of symmetry

If it contains centre of symmetry

If it can be superimposed on its mirror image

None of the above

The element with maximum first ionization energy is.

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B

N

O

C

The contact process is mainly used when acid is required for the manufactures of.

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Explosives

Fine chemicals

Lead accumulators

All above

The group H steels can be used n what temperature range.

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600^oC to 1100 ^oC

1000 ^oC to 1500 ^oC

1100 ^oC to 2000 ^oC

200 ^oC to 800 ^oC

Phosphoric acid is the most important of the phosphorus oxy acids. Industrially phosphoric acid is prepared by.

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The Ostwald process

The Haber's process

The reaction of phosphate rock with sulphuric acid

The reaction P4O10 with water.

Sterols are steroids having the functional gruup.

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Ketonic

Al;coholic

Phenolic

Aldehydic

The width of a typical DNA molecule is _______nm

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1

2

5

10

Glycerol on dehyeration gives

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Allyl alcohol

Aerolein

CHOH = C= CHOH

-CHO -CHOH -CH2OH

The concept of telluric helisx was developed by

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Lother meyer

A.E. de Chancourtois

New lands

Doberieiner

Hydrolysis of nucleoprotein result in the formation of.

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Proteins

Nucleic acids

Both A and B

They do not hydrolyse

Toluene is o/p -orienting with respect to an electrophilic substitution reaction due to.

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+1 effect of the methyl group.

+1 as wellas +H effect of the methyl group

Hyper conjugatin between the methyl group and phenyl ring.

+ R effect of the methyl group

Suppose a sample is analyzed for a particular constituent by two different method One can tell whether the two average values are significantly different by applying which of the following test.

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Student's test

F test

Chi square test

Variance

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