1
TS EAMCET 2020 (Online) 14th September Evening Shift
MCQ (Single Correct Answer)
+1
-0

Which element does not exist in elemental state in the earth's crust?

A

C

B

S

C

Fe

D

Au

2
TS EAMCET 2020 (Online) 14th September Morning Shift
MCQ (Single Correct Answer)
+1
-0

Which one of the following statements is true about the froth flotation method?

A

Ores possessing magnetic properties can be concentrated in this process

B

The mineral particles become wet by water

C

The mineral particles become wet by oil

D

It is not possible to separate a mixture of two sulphide ores by adjusting proportion of oil to water

3
TS EAMCET 2020 (Online) 11th September Evening Shift
MCQ (Single Correct Answer)
+1
-0

In the following reactions, identify $P, Q$ and $R$, respectively

I. $3 \mathrm{Fe}_2 \mathrm{O}_3+\mathrm{CO} \longrightarrow 2 P+\mathrm{CO}_2 \uparrow$

II. $\mathrm{Fe}_3 \mathrm{O}_4+4 \mathrm{CO} \longrightarrow 3 Q+4 \mathrm{CO}_2 \uparrow$

III. $\mathrm{Fe}_2 \mathrm{O}_3+\mathrm{CO} \longrightarrow 2 R+\mathrm{CO}_2 \uparrow$

A
P Q R
$$
\mathrm{Fe} \mathrm{}
$$
$$
\mathrm{Fe}_3 \mathrm{O}_4
$$
$$
\mathrm{Fe} \mathrm{O}
$$
B
P Q R
$$
\mathrm{Fe}_3 \mathrm{O}_4
$$
$$
\text { FeO }
$$
$$
\text { Fe }
$$
C
P Q R
$$
\mathrm{Fe}_3 \mathrm{O}_4
$$
$$
\text { Fe }
$$
$$
\text { FeO }
$$
D
P Q R
$$
\mathrm{Fe} \mathrm{O}
$$
$$
\mathrm{Fe}_3 \mathrm{O}_4
$$
$$
\mathrm{Fe}
$$
4
TS EAMCET 2020 (Online) 11th September Morning Shift
MCQ (Single Correct Answer)
+1
-0

The method, which is based on the principle that "different components of a mixture are differently adsorbed on an adsorbent" is called

A

zone refining method

B

vapour phase refining method

C

liquation method

D

chromatographic method

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