Question # 1

The number of electrons in the M shell of the element with atomic number 24 is

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24

12

13

8

Portland cement is manufactured by using

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Limestone, clay and sand

Limestone, gypsum and sand

Limestone, gypsum and alumina

Limestone, clay and gypsum

Which of these is the most widely used nitrogen fertilizer in Pakistan

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Urea

Ammonium nitrate

Ammonium Sulphate

Ammonium chloride

Potassium crystallizes with a

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Orthogonal lattice

Cubic lattice

Triclinic

Ortho rhombic lattice

Gooch crucible is used for the filtration of precipitates having

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High Solubility

High concentration

High ignition temperature

Low Temperature

Which of the following metal exhibits more than one oxidation?

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Na

Mg

Fe

Al

Inter molecular forces in solid hydrogen are

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Covalent forces

Van der Waal forces or London dispersion forces

Hydrogen bonds

All of these.

Calcium acetate when dry distilled

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Formaldehyde

Acetaldehyde

Acetone

Acetic anhydride

Octane number is zero for

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n-Heptane

Isooctane

n-Hexane

Isoheptane

The heat evolved in combustion of rhombic and monoclinic sulphur are -70960 and -71030 cal mol^-1respectively. What will be heat of conversion of rhombic sulphur to monoclinic?

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70960 calories

71030 calories

-70 calories

+70 calories

When sulphur is boiled with Na₂SO₃solution, the compound formed is

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sodium sulphides

Sodiums sulphates

Sodium persulphate

Sodium thiosulphate

Galena is an ore of

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Gallium

Lead

Tin

Germanium

When a carbon atom forms single bonds with other carbon atoms, these hybird orbitals overlap with the orbitals of hydrogen to form four bonds which are

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Three sigma and one P_i

Two sigma andtwo P_i

One sigma and three P_i

Sigma

Which is true for an element R present in group 13 of the periodic table?

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It is a gas at room temperature

It has oxidation state of +4

It forms R₂O₃

It forms RX₂

Minamata disease is due to pollution of

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Organic waste

Oil spill in water

Industrial waste containing mercury into fishing water

Arsenic into the atmosphere

Which of the following alcohols cannot be produced by treatment of aldehydes or ketones with NaBH₄or LiAIH₄?

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1-Propanol

2-Propanol

2-Methyl-2-propanol

Ethanol

Magnesium keeps on burning in

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N₂

CO₂

N₂O

N₂as well as CO₂

Which of the following does not reflect the periodicity of elements?

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Bonding begaviour

Electronegativity

Ionisation potential

Neutron/proton ratio

Red P can be obtained from white P by

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Heating it with a catalyst in an inert atmosphere

Distilling it in an inert atmosphere

Dissolving it in CS₂and crystallzing

Melting it and pouring the liquid into water

The number of atoms in 0.004 g of magnesium is close to

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24

2 x 10²⁰

10²⁰

6.02 x 10²³

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

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Tetraethyl lead

Lead tetrachloride

Lead acetate

Ethyl acetate

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