Question # 1

Which of the following elements is most electronegative?

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Oxygen

Chlorine

Nitrogen

Fluorine

Caustic soda is obtained by electrolysis of conc. aqueous solution of NaCI in a cell called

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Daniell's cell

Nelson's cell

Down's cell

Voltaic cell

What mass of NaOH is required to prepare 2.5 dm³of 1.5 M NaOH solution

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130 g

140 g

150 g

160 g

In a group of periodic table, atomic radii is:

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Remains some.

Increases.

First decreases then increases.

Decreases.

The amount of Ni in stainless steel is

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3%

4%

5%

8%

When propanamide reacts with Br₂and NaOH then which of the following compounds is formed?

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Ethyl alcohol

Propyl alcohol

Propyl amine

Ethylamine

It is common observation that rates of chemical reactions differ :

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Greatly.

A little bit.

Moderately.

Solvay process is used in the manufacture of

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Na₂CO₃

NaHCO₃

CaCl₂

All

Tollen's reagent is

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Ammonical cuprous chloride

Ammonical cuprous oxide

Ammonical silver bromide

Ammonical silver nitrate

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Decrease in temperature favour more dissolution of the salt

Increase in temperature favour more dissolution of the salt

Lowering pressure favour more dissolution of the salt

Increasing pressure favour more dissolution of the salt

The solubility product of AgCl is 2.0 x 10^-10mole ²dm^-6. The maximum concentration of Ag⁺ions in the solution is

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2.0 x 10^-10mole dm^-3

1.41 x 10^-5mole dm^-3

1.0 x 10^-10

4.0 x 10^-20mole dm^-3

Shahi Qilla may be destroyed by

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Flood in Ravi

Temperature mediated spoilage of marble

Air pollutants from Lahore chemical industries

All the above

The rate of reaction is denoted by

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dc/dp

dc/ac

dc/dT

dc/dt

The atomic radius increases as we move down a group because

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Effective nuclear charge increases

Atomic mass increases

Additive electrons are accommodated in new electron level

Atomic number increases

Law of mass action was given by :

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Guldberg and Waage.

Berkeley and Hartly.

Ramsay and Reyleigh.

Berthelot.

The essential component of organic compound is

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O

C

P

N

If pH of buffer of 1 mole dm^-3of HCOOH + 0.1 mole dm^-3HCOONa having pKa = 3.78 is

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1.78

2.78

3.78

4.78

Glycogen is stored in

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Animals

Plants

Soil

None of these

Wohler synthesized first of all the organic compound:

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Carbohydrates

Urea

Aniline

Toluene

A polymer may be

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Homopolemer

Co-polymer

Terpolymer

All of these

Which of the following oxides is unlikely to dissolve in aqueous hydroxide

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Al₂O₃

MgO

SO₂

SIO₂

Which of the following substances is used as an antiknock compound?

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Tetraethyl lead

Lead tetrachloride

Lead acetate

Ethyle acetate

The word paper is derived from the name of which reedy plany

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Rose

Sun flower

Papyrus

Water hyacinth

The weight of pure NaOH required to prepare 250 cm³of 0.1 N solution is

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4 g

1 g

2 g

5 g

Aledehydes ketones can be prepared form alcohols by their:

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Reduction

Oxidation

Decomposition

Synthesis

The product of the reaction between propanone and HCN is hydrolysed under acidic conditions. What is the formula of the final product

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CH₃CH(OH)COOH

CH₃CH₂CH(OH)COOH

(CH₃)₂C(OH)COOH

CH₃CH₂CH₂COOH

Which of the following element has the maximum electron affinity?

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F

S

I

Cl

Transition elements are called so because:

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Form interstital sompounds

have high m.p

In between 's' and' 'p' block elements

All of these

The unit of rate of reaction is

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mole dm^-3

mole Kg^-1

moles dm^-3sec^-1

grams dm^-3

Which of the following statements is not true?

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Isotopes with even atomic masses are comparatively abundant

Isotopes with even atomic masses and even atomic numbers are comparatively abundant

Isotopes with even atomic masses and odd atomic number are comparatively abundant

Phosphorus pentoxide finds use as

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An oxidizing agent

A reducing agent

A bleaching agent

A dehydrating agent

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