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

Subtopic:  Group 18 - Preparation, Properties & Uses |
 69%
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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

Subtopic:  Group 18 - Preparation, Properties & Uses |
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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 MnO2 and conc. H2SO4

(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

Subtopic:  Group 16 - Preparation, Properties & Uses |
 51%
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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

Subtopic:  Group 17 - Preparation, Properties & Uses |
 85%
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Which is a bad conductor of electricity?

(1) H2F2

(2) HCl

(3) HBr

(4) HI

Subtopic:  Group 17 - Preparation, Properties & Uses |
 70%
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HBr and HI reduce sulphuric acid; HCl can reduce KMnO4 and HF reduces:

1. H2SO4

2. KMnO4

3. K2Cr2O7

4. none

Subtopic:  Group 17 - Preparation, Properties & Uses |
 67%
From NCERT
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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) F2 is highly reactive

Subtopic:  Group 17 - Preparation, Properties & Uses |
 89%
From NCERT
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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

Subtopic:  Group 17 - Preparation, Properties & Uses |
 83%
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One can draw the map of a building on a glass plate by:

(1) HI

(2) HF

(3) HBr

(4) HCl

Subtopic:  Group 17 - Preparation, Properties & Uses |
 68%
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Which acid can combine with its own salt again?

(1) HF

(2) HBr

(3) HCl

(4) HI

Subtopic:  Group 17 - Preparation, Properties & Uses |
 55%
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