Argon is used:

1. To obtain low temperature

2. In high-temperature welding

3. In radiotherapy for the treatment of cancer

4. In filling airships

Under ambient conditions, the total number of gases released as products in the final step of the reaction scheme shown below is/are:

\(XeF_{6} \ \xrightarrow[]{\textbf{Complete hydrolysis}} \ P \ + \ other \ product\)
\(P \ \xrightarrow[]{OH^{-} / H_{2}O} \ Q \ \xrightarrow[]{\textbf{slow disproportionation in}\ OH^{-}/H_{2}O} \ Product\)

1. 0

2. 1

3. 2

4. 3

Among the following reactions, in which of the following, a blue complex will be formed when starch solution is added?

(A) When chlorine is passed through NaI

(B) Sodium iodate is treated with sodium bisulphite solution

(C) KI is treated with $Mn{O}_2$ and conc. $H_{2}S{O}_4$

(D) KI is added to bleaching powder containing dilute acetic acid

(1) A, C

(2) A, D,

(3) B, C, D

(4) A,B,C,D

Decreasing order of reducing power hydrogen halides is:

1. HI > HBr > HCl > HF

2. HF > HI > HBr > HCl

3. HI > HF > HBr > HCl

4. None of the above

Which is a bad conductor of electricity?

(1) $H_2{F}_2$

(2) HCl

(3) HBr

(4) HI

HBr and HI reduce sulphuric acid; HCl can reduce $KMn{O}_4$ and HF reduces:

1. $H_{2}S{O}_4$

2. $KMn{O}_4$

3. $K_{2}C{r}_2{O}_7$

4. none

The hydrogen fluoride is liquid, unlike the other hydrogen halides, because:

(1) fluorine is a smaller atom

(2) HF is the weakest acid

(3) HF molecules are associated due to hydrogen bonding

(4) $F_2$ is highly reactive

The correct order of the thermal stability of hydrogen halide (H-X) is:

(1) HI > HBr > HCl > HF

(2) HF > HCl > HBr > HI

(3) HCl < HF > HBr < HI

(4) HI > HCl < HF > HBr

One can draw the map of a building on a glass plate by:

(1) HI

(2) HF

(3) HBr

(4) HCl

Which acid can combine with its own salt again?

(1) HF

(2) HBr

(3) HCl

(4) HI