H2O2 restores the colour of old lead paintings by:
1. Converting PbO2 to Pb
2. Oxidising PbS to PbSO4
3. Converting PbCO3 to Pb
4. Oxidizing PbSO3 to PbSO4
The incorrect statement among the following regarding hydrogen is -
1. Hydrogen never acts as a cation in Ionic salts
2. Hydronium ion, H3O+, exists freely in a solution
3. Dihydrogen does not act as a reducing agent
4. Hydrogen has three isotopes of which Protium is the most common
Hardness of water cannot be removed by -
1. Clark's method
2. Adding washing soda
3. Calgon process
4. Filtration
A compound that acts as both reducing and oxidising agent is-
1. H2SO4
2. H2O2
3. KOH
4. KMnO4
A 1000 g aqueous solution of CaCO3 contains 10 g of calcium carbonate. The hardness of the solution is:
1. 10 ppm
2. 100 pm
3. 1000 ppm
4. 10000 ppm
H2O2 is prepared in the laboratory by the reaction of :
1. MnO2 with dilute cold H2SO4
2. BaO2 and CO2 bubbling through cold water
3. PbO2 with an acidified solution of KMnO4
4. Na2O2 with boiling water
On bubbling CO2 through a solution of barium peroxide in water:
1. O2 is formed
2. H2CO3 is formed
3. H2O2 is formed
4. H2 is formed
The correct statement among the following regarding perhydrol is -
1. It is 30% H2O2 or 100 vol. H2O2
2. Its molarity is 8.8 M
3. It is used as an antiseptic and a germicide
4. All of the above
The bleaching properties of H2O2 are due to its:
1. Reducing properties
2. Oxidising properties
3. Unstable nature
4. Acidic nature
When zeolites (hydrated sodium aluminum silicate) is treated with hard water, the sodium ions are exchanged with:
1. H+ ion
2. Ca2+ ion
3. ion
4. OH- ion