Question # 1

Azimuthal quantum number of last electron of ₁₁Na is

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1

2

3

0

Bronze is an alloy of Cu and

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Zn

As

Sb

Sn

Tertiary alkyl halides are practically inert to substitution by S_N2 mechanism because of

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Onsolubility

Instability

Inductive effect

Steric hindrance

Proton was discovered by:

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Chadwick

J.J. Rhomson

Millikan.

Goldstein.

Alcohals can be distinguished using test:

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Lucas

Tollen's

Koib's

William's

Decreases om concentration of reactant is denoted by

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dc/dt

-dc/dt

+dc/dt

None

Which is used in navigational equipments?

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B

Be

Mg

Al

Hydrolysis of Grignard's reagent gives:

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Alkane

Alkyl

Halide

Alcohol

B-B'-dichloroethyl sulphide is commonly known as

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Mustard gas

Laughing gas

Phosgene gas

Bio gas

Which of the following is not a synthetic polymer?

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Polyethylene

PVC

Nylon

Cellophane

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84.84 %

89.89%

81.81%

90.90%

A solution containing maximum amount of solute dissolved at a given temperature is called

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Saturated solution

Unsaturated solution

Supersaturated solution

Impure solution

Aldehydes are oxidizes are to give:

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Primary alcohol

Sec-alcohol

Ter-alcohol

Carboxylic acid

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Neutrons are attracted by nucleus

Neutrons carry out nuclear reactions

Neutrons carry no charge

Neutrons are electromagnetic radiations

Which of the following pair contains isomers of each other

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Propanoic acid and propanone

Acetone and acetaldehyde

Ethyl alcohol and diethyl ether

Methyl alcohol and dimethyl ether

The configuration 1s²2s²2p⁵3s¹shows

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Excited state of O₂

Excited state of neon

Excited state of fluorine

Ground state of fluorine atom

Ecosystem is a smaller unit of

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Hydrosphere

Lithosphere

Biosphere

Atmosphere

Substitution of halogen in the benzene ring requires catalyst

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AlCl₃

FeCl₃

SiO₂

Organo - nickel

Which compound will not dissolve in H₂O

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C₆H₆

C₂H₅OH

CH₃CH₂CH₂OH

CH₃- OH

When 0.1 g of magnesium is treated with an excess of hydrochloric acid, what volume of gas at room temperature and pressure will be produced

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10 cm³

25 cm³

48 cm³

100 cm³

The catalytic prmoter used for the industrial preparation of acetaldehyde is

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PdCI₂

CuCI₂

Pd + CaCI₂

None of these

With the increase in carbon no. the solubility of carboxylic acids

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Increases

Decreases

Remains same

None of these

Among the lanthandes the one obtained by synthetic method is

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Lu

Pm

Pr

Gd

Which of the following expressions show a heterolytic bond fission

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At present the number of fertilizers plants in Pakistan are

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10

12

14

20

Result of ozone hole is

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Green house effect

Global warming

Acid rain

UV rays reach the earth

The number of neutrons in the element ⁹₄Be is

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4

5

9

13

Orbitals having same energy are called

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Hybrid orbitals

Valence orbitals

Degenerate orbitals

D-orbitals

Hydrocarbons contain

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C and S only

C and H only

C, H, and O only

C, H, O and N only

The substance added in the paints for improving the mechanical properties is called

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Pigment

Filter

Stabilizer

Binder

Calcium acetate when dry distilled gives

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Formaldehyde

Acetaldehyde

Acetone

Acetic anhydride

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