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551.

Consider the following statements
Coke is one of the material of the charge added to blast furnace for the production of Steel / iron. its function is to
1. Act as a reducing agent.
2. Remove silica associated with the iron ore.
3. Function as fuel, to supply heat.
4. Act as an oxidizing agent.
Of these statements
(a)1 and 2
(b)2, 3 and 4
(c)1 and 3
(d)1, 2, 3 and 4
Comment
Answer is: C

552.

Consider the following statements
1. Bronze is an alloy of Copper containing Tin and Aluminium.
2. White gold is an alloy of gold containing platinum and lead.
Choose right answer.
(a)Only 1
(b)Only 2
(c)Both 1 and 2
(d)None of the above
Comment
Answer is: A

553.

Consider the following elements
1. Cobalt
2. Phosphorus
3. Zinc
Which the above element are required for maintaining the healthy human body.
(a)1 and 2
(b)2 and 3
(c)1 and 3
(d)1, 2 and 3
Comment
Answer is: D

554.

Consider the following statements
1. The carat is a unit of purity for gold alloys.
2. 18 carat gold is 24 parts gold and 6 parts another metal.
Which of the statement given above is/are correct?
(a)Only 1
(b)Only 2
(c)Both 1 and 2
(d)None of the above
Comment
Answer is: A

555.

Consider the following statements
1. In electro-refining, the impure metal is made anode.
2. In metallurgy, flux is substance used to convert fusible impurities to infusible impurities.
3. Copper is extracted by thermal reduction process.
Which one true.
(a)Only 1
(b)2 and 3
(c)1 and 3
(d)1, 2 and 3
Comment
Answer is: C

556.

Bronze is often used to make statues and medals whereas brass is used in making utensils, scientific apparatus and catridges. Both brass and bronze are copper containing alloys, yet they differ in their chemical composition for additionally containing.
(a)Zinc in brass and tin in bronze
(b)Chromium in brass and nickel in bronze
(c)Nickel in brass and tin in bronze
(d)Iron in brass and nickel in bronze
Comment
Answer is: A

557.

Which of the following is a true statement regarding calcination?
(a)The ore is heated strongly in the absence of any blast of air
(b)The ore is heated with calcium
(c)The ore is heated with carbon
(d)The mineral is melted with limestone
Comment
Answer is: A

558.

When metal is obtained in the molten state from its Ore, the process may be called
(a)Rusting
(b)Smelting
(c)Calcination
(d)Thermal dissociation
Comment
Answer is: B

559.

Dead burnt is
(a)Anhydrous Na2SO4
(b)Na2Co3 which is useful for softening
(c)CaSo4 which is not useful for softening
(d)Anhydrous CuSO4
Comment
Answer is: C

560.

Consider the following statements
Roasting is carried out to
1. Convert sulphide to oxide and suphate.
2. Remove water of hydration.
3. Melt the ore.
4. Remove arsenic and sulphur impurities.
Of these statements
(a)1, 2 and 3
(b)1 and 4
(c)1, 2 and 4
(d)2, 3 and 4
Comment
Answer is: C

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