Question # 1

Which of the following acids acts as acid waste from coal mines.

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HCl

HNO3

CH3COOH

H3PO4

All the strong acids have very close pKas value and they appear to have nearly equal strengths in aqueous solutions. The phenomenon is called as.

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Levelling effect

Differnetiating effect

Levelling solvent

Differnetiating solvent

Which of the following carbonates decomposes at the highest temperature.

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Mg CO3

CaCO3

Sr CO3

Ba CO3

According to SHAB, Lewis acid are divided into.

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Two classes

Three classes

Four classes

None of above

A terpenoid which as an alcoholic group in the molecule is

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Citral

Camphor

Menthol

Carvone

The energy gap between two bands so large that it effectively prevents the promotion of electron from the lower to the higher band such energy gap all called.

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Ionization zone

Dissociation zone

Distinction zone

Forbidden zone

The oxidation number Xe in XeOF2 is

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0

+2

+4

+3

The atomic number of potassium is 19 and that of mangness is 25 Although the colour of MnO4 is dark violet yet the K+ is colourless this is due to the fact that.

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Mn is a transition element while K+ is not

[MnO4]- is negatively charged while K+ has positive charge

The effective atomic number of Mn is [MnO4]- is 26: while for K+ the atomic number is 18

The Mn is a high positive oxidation state allows charge transfer transitions.

Ionization potential of carbon is.

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11.2

7.8

8.1

7.3

Most effective pesticide is

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Carbonates

Organophosphates

Organ chlorines

All of these

Pyrolysis gasoline is obtained from.

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Catalytic cracking

Gasification

Steam cracking

Reforming

The increase in boiling points of noble gases from He to Xe is due to the

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Decreases in ionization energy

Increases in polarizability

Increase in electron affinity

Increase in atomic volume

Enantiomers have which of the following characteristics.

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Rotate ordinary light

Have the same melting point

Are superimposable mirror images

React with optically active molecule at the same rate

Pick out the incorrect statements for transition metals.

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They have low melting and boiling points

5d-element have higher energies than 3d or 4 d elements

Zr and Hf have almost identical atomic and ionic radii

They form interstitial compounds.

Petrol can be saved by

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Driving at a constant and moderate speed

Ensuring correct type pressure

Switching off the engine at traffic lights

All of these

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 statement is false.

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If a reaction is thermodynamically spontaneous it may occur rapidly

If a reaction is thermodynamically spontaneous it may occur slowly.

Activation energy is a kinetic quantity rather than a thermodynamic quantity.

If a reaction is thermodynamics spontaneous, it must have a low activation energy.

Which of the following steps are involved in the extraction of copper.

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Roasting

Smelting

Refining

All

A gas obeying the van Waals equation will closely resemble and ideal gas if

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The parameters 'a' and 'b' are small

'a' is small but 'b' is large

'a' is large but 'b' is mall

None of the above

The Langmuir theory of unimolecular adsorption is generally valid at.

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Low pressures and low temperature

Low pressures and high temperature

High pressures and low temperature

High pressure and high temperature

How many varieties of commercial iron are known.

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1

2

4

3

The relative error is usually expressed as

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Parts per ten

Parts per one

Parts per hundred

Botha C and D

Which of the following species has highest bond energy.

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H2

T2

D

Cl

Washing soap can be prepared by saponification with alkali of _____ of the following oil.

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Rose oil

Paraffin oil

Groundnut oil

Coconut oil

Which of the following elements display maximum tnedency to form P Pi - p PI multiple bonds with itself and with carbon and oxygen.

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N

p

Bi

As

The IUPAC name of HCOOCH3 is.

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Methoxy methanol

Ethanoic acid

Methyl methanoate

Methoxy methane

A 10% solution of sucrose contains 10 g of sucrose in how much volume of the solution.

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10 mL

100 mL

1000 mL

1 mL

When FeSO4 is added in the sodium extract the compound formed is.

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Only Na4[Fe (CN)6]

Only Fe (OH)2

Only Na2So4

Mixture of all these

1 meter = ___________ nm

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10⁹

10^-9

10¹⁰

10^-10

Which of the following element has six electrons in the valance shell but cannot exhibit a maximum co valency of six.

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Sulpher

Oxygen

Salenium

Both A and B

The angle of rotation in a polarimeter depends on.

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Nature of the compound

Nature of the solvent

Wavelength of the light used

All above factors.

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