1
TS EAMCET 2023 (Online) 13th May Evening Shift
MCQ (Single Correct Answer)
+1
-0

$$ \begin{aligned} 4 \mathrm{Ag}(s)+8 \mathrm{CN}^{-}(a q) & +2 \mathrm{H}_2 \mathrm{O}(a q)+\mathrm{O}_2(g) \longrightarrow 4\left[\mathrm{Ag}(\mathrm{CN})_2\right]^{-}(a q)+4 \mathrm{OH}^{-}(a q) \end{aligned} $$

The above reaction represents the process of concentration of ore in the extraction of silver. The process is

A

leaching

B

levigation

C

froth floatation

D

liquation

2
TS EAMCET 2023 (Online) 13th May Evening Shift
MCQ (Single Correct Answer)
+1
-0

Which one of the following statements is correct?

A

$\mathrm{N}_2$ is a brown coloured gas.

B

$\mathrm{O}_3$ is thermodynamically stable compared to oxygen.

C

Rhombic sulphur is stable at room temperature.

D

$\mathrm{Cl}_2$ is a colourless gas.

3
TS EAMCET 2023 (Online) 13th May Evening Shift
MCQ (Single Correct Answer)
+1
-0

Which oxo-acid of sulphur contains $\mathrm{S}-\mathrm{O}-\mathrm{S}$ bond?

A

$\mathrm{H}_2 \mathrm{~S}_2 \mathrm{O}_5$

B

$\mathrm{H}_2 \mathrm{~S}_2 \mathrm{O}_4$

C

$\mathrm{H}_2 \mathrm{~S}_2 \mathrm{O}_7$

D

$\mathrm{H}_2 \mathrm{~S}_2 \mathrm{O}_8$

4
TS EAMCET 2023 (Online) 13th May Evening Shift
MCQ (Single Correct Answer)
+1
-0

Which of the following reaction gives nitrogen (II) oxides as one of the products?

A

$\mathrm{Cu}+$ dil. $\mathrm{HNO}_3 \rightarrow$

B

$\mathrm{Cu}+$ conc. $\mathrm{HNO}_3 \rightarrow$

C

$\mathrm{Zn}+$ conc. $\mathrm{HNO}_3 \rightarrow$

D

$\mathrm{Zn}+$ conc. $\mathrm{HNO}_3 \rightarrow$

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