Question # 1

For most of the chemical reactions the rate of reaction

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Increase as the reaction proceeds

Decrease as the reaction proceeds

May increase or decrease during the reaction

Remains constant as the reaction proceeds

The valence orbital configuration of an element with atomic number 23 is

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3d⁵

3d³, 4s²

3d³, 4s¹, 4p¹

3d², 4s², 4p¹

Among alkali metal salts, the lithium salts are the poorest conductors of electricity in aqueous solution because of

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Easy diffusion of Li⁺ions

Lower ability of Li⁺ions to polarize water molecules

Lowest charge to radius ratio

Higher degree of hydration of Li⁺ions

Which of the following imparts violet colouration to non-luiminous flame of Bunsen burner?

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NaCl₂

BaCl₂

CaCl₂

KCl

Sea weeds are important source of

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Iron

Chlorine

Iodine

Bromine

The credit of discovering neutron goes to

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Rutherford

Langmuir

Chadwick

Austen

In N.W.F.P the phosphate fertilizers are produced at

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D.I.Khan

Haripur

Nowshera

Dargai

Magnesium keeps on burning in

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N₂

CO₂

N₂O

N₂as well as CO₂

The percentage of oxygen in NaOH is

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40

60

8

10

The kinetic theory of gases predicts that total kinetic energy of a gaseous assemble depends on

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Pressure of the gas

Temperature of the gas

Volume of the gas

Pressure, temperature, and volume of the gas.

The bond angle H-O-H in ice is closest to

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120° . 28'

60°

90°

109°

Phenol is heated with CCl₄and alkaline KOH when salicylic acid is produced. The reaction is known as

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Frledel-Craft reaction

Riemer-Tiemann's reaction

Rosenmund's reaction

Sommelet reaction

In which of the following elements +1 oxidation state is more stable than +3

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B

Al

ga

Ti

Which of the following geometry is associated with the compound in which the central atom assumes sp³d hybridization?

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Planar

Pyramidal

Angular

Trigonal bipyramidal

Which of the following has greatest tendency to lose electron?

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F

Fr

S

Be

Fluorine does not show positive oxidation states due to the absence of

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d-orbitals

s-orbitals

p-orbitals

None

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