Question # 1

Which compound would undergo nucleophilic addition

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Ethene, C₂H₄

Bromoethane, C₂H₅Br

Ethanal, CH₃CHO

Ethane, C₂H₆

Which statement about an atom is true ?

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The number of neutrons is not equal to number of electrons

Mass number is less than atomic number

All the elements have only one mass number

Mass number can be equal to atomic number

Two moles of HI was heated in a sealed tube at 440°C till the equilibrium was reached. HI was found to be 22% decomposed. The equilibrium constant for dissociation is

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0.282

0.0796

0.0199

1.99

The acid showing salt like character in aqueous solution is

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Acetic acid

Benzoic acid

Formic acid

α - Aminoacetic acid

The process in which the solvent molecules are surrounded and interact with solute ions or molecules is called

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Solvation

Hydration

Hydrogenation

None

Francium is an element at the bottom of Group I in the Periodic Table. Which one of the following predication is likely to be correct?

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It will react with water to liberate oxygen

Its hydroxide will be a strong alkali in water

Its carbonate will decompose on heating to give carbon dioxide

Its nitrate on heating will give nitrogen dioxide and oxygen

In the chemical combination of sodium and hydrogen to form NaH:

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Hydrogen atom gains an electron.

Sodium atom gains an electron.

Both the atoms share the electron.

Cracking products are :

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Only alkanes

Only alkenes

Alkanes and alkenes

Alkynes

During a chemical reaction heat may be

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absorbed

Evolved

Both evolved and absorbed

None of these

n-butane and iso butane are an example of

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Chain isomerism

Positional isomerism

Meta merism

Functional group isomerism

The quality of petroleum is determined by

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Decane number

Octane number

Nexane number

None of these

Which period starts from ₁₁Sc to ₃₀Zn ?

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First Period

Second Period

Third Period

4th Period

f-Block elements are also called

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Non typical transition elements

Outer transition elements

Normal transition elements

Inner transition elements

Which of the following is an example of ketohexose?

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Mannose

Galactose

Maltose

Fructose

Selection of filter paper depends upon sizes of particles to be:

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Tested

^Filtered

Checked

All of above

Which statement is not true. A solution is a homogeneous mixture of

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Two ionic substance like NaCl and HCl

Two molecular substances sugar and water

A solute and a solvent 1% NaHCO₃in water

NaCl and sand

Atoms and molecules can either gain or lose electrons, forming charge particles called:

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Positrons

Photons

Ions

Electrons

Each molecule of haemoglobin is 68000 times heavier than one atom of

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C

H

N

O

Noble gases have the electronic configuration with their valance shell ns²np⁶except one

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He

Ne

Kr

Xe

In azeotropic mixture showing negative deviation form Raoult's law show

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Higher b.p. than either

Lower b.p. than either

No change in b.p.

None of these

Cyanohydrin of which of the following forms lactic acid

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HCHO

CH₃COCH₃

CH₃CHO

CH₃CH₂CH₂CHO

Prevention of corrosion of iron by Zn coating is called

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Galvanization

Cathodic protection

Electrolysis

Photoelectrolysis

The development of disagreeable odur in fats or oil is called

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Fragrance

Perfume

Rancidity

Smell

The pressure of vapours when sent to the ionization chamber in mass spectrometer is

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10^-5to 10^-6torr

10^-6to 10^-7torr

10^-7to 10^-8torr

10^-3to 10^-4torr

If the difference of pKa values of the two acids is 2, then

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Acid with smaller pKa is 10 times stronger acid

Acid with greater pKa is 10 times stronger acid

Acid with smaller pKa is 100 times stronger acid

Acid with greater pKa is 100 times stronger acid

Which has soapy touch?

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Na2B4O7

H3BO3

Ca2B6O11

HBO2

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0.60

1.67

0.66

2.6

At certain temperature, 50% of HI is dissociated into H₂and I₂the equilibrium constant is

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1.0

3.0

0.5

0.25

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

In the hydrolysis of CH₃COOC₂H₅the acid produced is

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Inhibitor

Catalyst

Auto catalyst

None of above

The substance which increases rate of reaction but remains unchanged at the end of reaction is called :

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Catalyst.

Indicator.

Promoter.

Activator.

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