Question # 1

Elevated concentration of ______________ is harmful for fish as it clog the gills causing suffocation

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AI

Hg

As

Cr(vi)

What is the formula of talc or soapstone?

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Na2B4O7.10H2O

H2Mg3(SiO3)4

Cu2S

NaNO3

Ozone is produced in regions:

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tropical

Polor

antaric

equator

Coagulation in the purification of water is carried out by

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Alum

NiSO₄

BaSO₄

CuSO₄

Number of electrons involved in d-d transition of [Ti(H2O)6]+3

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1

3

2

4

Crystal can be classified in to ......basic crystal habits

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7

4

14

3

The maximum hydrogen bonding is in:

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diethyl ether

ethanol

water

benzene

The question vapour cause by heating a liquid is due to:

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increase of intermolecular interactions

increase of K.E of molecules

decrease of surface tension

increase in potential energy of molecules

In esterification, the OH of carboxylic acid is replaced by

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OR+

R+

OR

R

Eleven elements made part of earth mass:

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97.5%

98.5%

99.5%

100%

The optimum pH value for the enzyme pepsin is

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10

1.4

8

6

The silver bromide in hypo (Na₂S₂O_{3) solution is}

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Soluble

Not soluble

Precipitated

Not effect

Linear shape is associated with which set of hybrid orbitals

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sp

sp²

sp³

dsp²

Taste of lower alcohols is:

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Sweet

Bitter

Our

Salty

The % of CO₂is the atmosphere is

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3.0%

0.03%

0.3%

0.5%

The rotation of two carbon atoms joined by double bond would happened only if

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Pi bond is broken

Sigma bond is broken

Both bonds are broken

None of above

The temp. used for the hydrogenation of alkenes using Ni is

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2000°C

400°C

200-- 300°C

1000°C

When electrons revolve in stationary orbits

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There is no change in energy level

They vecome stationary

They are gaining kinetic energy

There is increase in energy

Which of the following was discovered first:

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Charge to mass ratio of electrons.

Mass of electrons.

Charge of electrons.

All of above at same time.

The base used in Cannizzaro's reaction is

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NaOH

KOH

CHI₃

All of these

Chromatography is derived from Greek word 'Khromatos' means:

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Type writting

Printing

Color writing

Writing

The rate of reaction between two specific time intervals is called

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Instantaneous rate

Average rate

Specific rate

Ordinary rate

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