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561.

Chemical leaching is useful in the concentration of
(a)Copper pyrites
(b)Bauxite
(c)Galena
(d)Cassiterite
Comment
Answer is: B

562.

Calcium is obtained by the
(a)Roasting of limestone
(b)Electrolysis of solution of calcium chloride in H2O
(c)Electrolysis of molten anhydrous calcium chloride
(d)Reduction of calcium chloride with carbon
Comment
Answer is: C

563.

In electro-refining of copper, some gold is deposited as
(a)Cathode
(b)Electrode
(c)Cathode mud
(d)Anode mud
Comment
Answer is: D

564.

Consider the following statements
1. Pig iron is obtained from the bottom of blast furnace in the metallurgy of iron.
2. Pig iron contains approximately 4.3% carbon.
Which of the following statements is/are correct?
(a)Only 1
(b)Only 2
(c)Both 1 and 2
(d)None of the above
Comment
Answer is: C

565.

Consider the following statements
1. Vanadium is a toxic very hard silvery white metallic element.
2. Thorium is a dark grey radioactive metallic element of the actinide series.
Which is/are correct?
(a)Only 1
(b)Only 2
(c)Both 1 and 2
(d)None of the above
Comment
Answer is: C

566.

Barium in a suitable form is administered to patients before an X-ray examination of the stomach, because
(a)Berium allow x-rays to pass through the stomach on account of its transparency to x-rays.
(b)Barium compound, like magnesium sulphate helps in cleaning the stomach before taxes examination
(c)Barium salts are white in color and this help the stomach to appear clearing in contract with the other region in the picture
(d)Barium is a good observer of X-rays and this helps the stomach to appear clearing in contact with other region in picture
Comment
Answer is: C

567.

Consider the following statements
1. Ore is heated generally in the absence of air then process is called calcination.
2. Ore is heated generally in the presence of air, then process is called roasting.
3. Reduction of oxide with carbon at high temperature is called smelting.
Which of the above are true?
(a)1 and 2
(b)2 and 3
(c)1 and 3
(d)1, 2 and 3
Comment
Answer is: D

568.

Consider the following statements
1. Galvanisation is the method of protecting steel and iron from rusting by coating them with a thin layer of zinc.
2. Pure iron is very soft but if it is mixed with a small amount of carbon, It become hard and strong.
3. When iron is mixed with Nickel and chromium, we get stainless steel, which is hard and does not rusting.
Which of the statements given above are correct?
(a)1 and 2
(b)2 and 3
(c)1 and 3
(d)1, 2 and 3
Comment
Answer is: D

569.

Following statements are made in connection with carbon dioxide.
1. CO2 is poisonous gas.
2. CO2 is an acidic oxide.
3. CO2 turns lime water milky.
Which of the statement are correct?
(a)1 and 2
(b)2 and 3
(c)1 and 3
(d)None of the above
Comment
Answer is: B

570.

Which one among the following statement is not correct about graphite?
(a)It is the most stable allotrope of carbon
(b)It is an electrically conducting material
(c)Crystalline spherical beads of graphite have very good lubricating property under dry conditions
(d)It is the higher grade of coal
Comment
Answer is: D

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