Question # 1

Urea is nitrogenous fertilizer. It consist of nitrogen.

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26.6 %

36.6%

46.6%

56.6%

Blast furnace usually used for the metallurgy of.

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Iron

Copper

Aluminum

Both a and b

The elements that do not conduct heat and electricity are called.

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Metallurgy

Non metal

Metalloid

Alloy

The raw materials for the manufacturing of urea are.

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Ammonia

Carbondioxide

Limestone

a & b

Chalco-pyite is an ore of:

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iron

aluminium

silver

copper

In smelting process a small amount of coke is required because:

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it is highly endothermic process

it is highly exothermic process

it is very fast process

it is very slow process

Chalco-Pyrite is an ore of:

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Copper

Silver

Iron

Aluminium

The process of removal of gangue form the ore is technically known as:

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concentration

purification process

metallurgy

refining

The number of carbon atoms present in petroleum gas.

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1-2

1-3

1-4

1-5

The number of carbon atoms present in kerosene oil.

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8-12

9-12

10-12

11-12

When CO₂ is passed through the ammonical brine the only salt that precipitates is:

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NaHCO₃

NH₄HCO₃

Na₂CO₃

(NH₄)₂CO₃

How many % age of nitrogen in urea fertilizers?

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40.6

45.6

46.6

50

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