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 and conc.
(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)
(2) HCl
(3) HBr
(4) HI
HBr and HI reduce sulphuric acid; HCl can reduce and HF reduces:
1.
2.
3.
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) 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
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