1
AP EAPCET 2025 - 23rd May Evening Shift
MCQ (Single Correct Answer)
+1
-0

Which of the following reactions is an example of roasting?

A

$\mathrm{ZnCO}_3 \longrightarrow \mathrm{ZnO}+\mathrm{CO}_2$

B

$2 \mathrm{PbS}+3 \mathrm{O}_2 \longrightarrow 2 \mathrm{PbO}+2 \mathrm{SO}_2$

C

$\mathrm{Fe}_2 \mathrm{O}_3+3 \mathrm{C} \longrightarrow 2 \mathrm{Fe}+3 \mathrm{CO}$

D

$\mathrm{FeO}+\mathrm{SiO}_2 \longrightarrow \mathrm{FeSiO}_3$

2
AP EAPCET 2025 - 23rd May Morning Shift
MCQ (Single Correct Answer)
+1
-0

Consider the following.

Statement-I In the extraction of Al by Hall-Heroult process, pure $\mathrm{Al}_2 \mathrm{O}_3$ mixed with $\mathrm{Na}_3 \mathrm{AlF}_6$ lowers its melting point and increases conductivity.

Statement-II Zirconium metal is purified by zone refining method.

The correct answer is

A

Both statement-I and statement-II are correct.

B

Both statement-I and statement-II are not correct.

C

Statement-I is correct, but statement-II is not correct.

D

Statement-I is not correct, but statement-II is correct.

3
AP EAPCET 2025 - 22nd May Evening Shift
MCQ (Single Correct Answer)
+1
-0

Which of the following is used as froth stabilizer in froth floatation process?

A

Xanthate

B

Aniline

C

Pine oil

D

NaCN

4
AP EAPCET 2025 - 22nd May Morning Shift
MCQ (Single Correct Answer)
+1
-0

In the extraction of iron from haematite, the impurity $(x)$ of the ore is removed in the form of ' $y$ ', what are $x$ and $y$ respectively?

A

$\mathrm{SiO}_2, \mathrm{CaSiO}_3$

B

$\mathrm{CaO}, \mathrm{CaSiO}_3$

C

$\mathrm{SiO}_2, \mathrm{FeSiO}_3$

D

$\mathrm{P}_2 \mathrm{O}_5, \mathrm{Ca}_3\left(\mathrm{PO}_4\right)_2$

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