For the bleaching of hair, the substance used is:
1.
2. Bleaching powder
3.
4.
Decolourisation of acidified potassium permanganate by is due to:
1. Oxidation of
2. Reduction of
3. Both oxidation and reduction of
4. None of the above.
(1) neutral solution
(2) acidic solution
(3) alkaline solution
(4) non-polar medium
Tellurium hydride on dissolution in water gives:
(1)
(2)
(3)
(4) None of these
Covalent hydride among the following is -
1.
2.
3.
4.
The conversion of atomic hydrogen into ordinary hydrogen is:
1. exothermic change
2. endothermic change
3. nuclear change
4. photochemical change
Nascent hydrogen consists of :
(1) hydrogen atoms with excess energy
(2) hydrogen molecules with excess energy
(3) hydrogen ions in an excited state
(4) solvated protons
The acidified solution of is reduced by passing:
(1) ordinary
(2)
(3) nascent H
(4)
Atomic hydrogen produces formaldehyde when it reacts with:
(1)
(2) CO
(3)
(4)
The percentage of a para-hydrogen in ordinary hydrogen increases when:
1. temperature is lowered
2. temperature is increased
3. pressure is increased and temperature decreased
4. none of these