Question

Read the following and answer any four questions:

The Earth's crust is a major source of metal. The element which occurs naturally in earth

crust is known as mineral, metal is found in a free state, combined state as oxides. Ores are usually contaminated by impurities. These impurities are removed by various

methods such as roasting, calcination, and electrolytic refining, etc.

i a. Ag and Hg

Which of the following pair of metals exist in their native state in nature?

b. Ag and Zn

c. Au and Hg

d. Au and Ag

11. Sulphide ore is converted into metal oxide by the process of:

a, carbonation

b. roasting

c. calcination

d. anodising

is an ore of mercury.

a. Cinnabar

b. Mercury oxide

c. Hematite

d. Bauxite

iv. Which of the following statement is correct?

a. Na and K are the least reactive elements

b. Mg and Al are highly reactive elements

c. Zn, Fe are highly reactive elements

d. Pb is the least reactive element

v. Which of the following alloys contains mercury as one of the constituents?

a. Stainless steel

b. Solder

C. Duralumin

d. Zinc amalgam





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Answer 1

Answer:

1st-Au and Ag(Non-reactive metals like gold and silverr are found in the free state. )

2nd-roasting(This process is known as roasting. Sulphide ores are converted to oxides by heating in presence of excess air.)

3rd-cinnabar(Cinnabar is an ore of mercury)

5-zinc amalgam(Zinc amalgam is an alloy of mercury (10%) with zinc (90%). It contains mercury as one of its constituents. An alloy of mercury with another metal is called amalgam. )