Question # 1

Gooch crucible is used for the filtration of precipitates having

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High Solubility

High concentration

High ignition temperature

Low Temperature

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

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B

Al

ga

Ti

Which has maximum protein content?

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Ground nut

Cow milk

Egg

Wheat

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

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D.I.Khan

Haripur

Nowshera

Dargai

If one litre of air is passed repeatedly over heated copper and magnesium till no further reduction in volume takes place, the volume finally obtained would be approximately

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800mL

200mL

10mL

Zero

Dilute hydrochloric acid solution cannot be concentrated by boiling beyond

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11%

33%

44%

22%

Fertililzer are made by

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Nature only

Artificial methods only

Both artificial and natural methods

None of the above

Which of the following has no tin in its composition?

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Solder

Bronze

Brass

Tin stone

Which of the following as a molecular diseaes?

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Allergy

Cancer

German measles

Sickle cell anemia

Sodium metal cannot be stored under

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Benzene

Kerosene oil

Alcohol

Toluene

The total number of protons in 10 g of calcium carbonate is (N₀= 6.023 x 10²³)

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1.5057 x 10²⁴

2.0478 x 10²⁴

3.0115 x 10²⁴

4.0956 x 10²⁴

Which has largest radius?

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CO³⁺

Mn³⁺

Fe³⁺

Cr³⁺

When sulphur is boiled with Na₂SO₃solution, the compound formed is

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sodium sulphides

Sodiums sulphates

Sodium persulphate

Sodium thiosulphate

The osmotic pressure of solution increases if

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Temperature is decreased

Solution constant is increased

Number of solute molecules are increased

Volume is increased

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

The percentage of nitrogen in urea is

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46

60

70

80

Phosphide ion has the electronic structure similar to that of

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Nitride ion

Fluoride ion

Sodium ion

Chloride ion

The wire in the flash bulbs is made up of

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Mg

Ba

Cu

Ag

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

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Urea

Ammonium nitrate

Ammonium Sulphate

Ammonium chloride

DDT is formed from

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Benzene and Chlorobenzene

Chloral and Chlorobenzene

Chloral and benzene

Chlorobenzene and chlorine

Aldehydes are produce in atmosphere by

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Oxidation of secondary alcohols

Reduction of alkenes

Reaction of oxygen atoms with hydrocarbons

Reaction of oxygen atoms with ozone.

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