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
HF present as impurity in gaseous can be removed by passing over:
(1)
(2) NaF
(3)
(4)_
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
Pure HF does not attack:
(1) Glass
(2) Fe
(3)
(4) Polythene
Which of the following halogen acids has the lowest boiling point?
(1) HF
(2) HCl
(3) HBr
(4) HI
Spirit of salt is:
(1) HBr
(2) HCl
(3)
(4) HI
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 gas
Consider the following reactions:
(A) reacts with an aqueous solution
(B) is passed through suspension of iodine
(C) reacts with dry
(D) is passed through an aqueous solution
Select the reactions in which HCl is produced
(1) A, B, C, D
(2) A, B, D
(3) B, D
(4) all of these
Pure HBr may be obtained by heating sodium bromide with syrupy phosphoric acid and not with concentrated sulphuric acid because concentrated sulphuric acid is:
(1) more volatile
(2) less stable
(3) a weaker acid
(4) an oxidising agent