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 |
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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 |
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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 |
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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 |
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HF present as impurity in gaseous F2 can be removed by passing over:

(1) P2O5

(2) NaF

(3) H2SO4

(4)_ CaCl2

Subtopic:  Group 17 - Preparation, Properties & Uses |
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Hydrofluoric acid is not preserved in glass bottles because:

(1) It reacts with the visible part of light

(2) It reacts with the sodium oxide of the glass composition

(3) It reacts with the aluminium oxide of the glass composition

(4) It reacts with the silicon dioxide of glass

Subtopic:  Group 17 - Preparation, Properties & Uses |
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Pure HF does not attack:

(1) Glass

(2) Fe

(3) SiO2

(4) Polythene

Subtopic:  Group 17 - Preparation, Properties & Uses |
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Which of the following halogen acids has the lowest boiling point?

(1) HF

(2) HCl

(3) HBr

(4) HI

Subtopic:  Group 17 - Preparation, Properties & Uses |
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Spirit of salt is:

(1) HBr

(2) HCl

(3) H2SO4

(4) HI

Subtopic:  Group 17 - Preparation, Properties & Uses |
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Concentrated hydrochloric acid when kept in open air sometimes produces a cloud of white fumes. This is due to:

(1) strong affinity of HCl gas for moisture in air results in forming of droplets of liquid solution which appears like a cloudy smoke

(2) due to strong affinity for water, conc. HCl pulls moisture of air towards self. The moisture forms droplets of water and hence the cloud.

(3) Conc. HCl emits strongly smelling HCl gas all the time

(4) Oxygen in air reacts with mitted HCl gas to form a cloud of Cl2 gas

Subtopic:  Group 17 - Preparation, Properties & Uses |
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