Oxalic acid when heated with conc. H2SO4 gives
CO, CO2 and H2O
CO2 and H2S
Oxalic sulphate
Oxygen is prepared commercially from
Sodium and water
Electrolysis of water
KCIO3
HNO3
Which hydride is most acidic?
H2O
H2S
H2Te
H2Se
Which of the following isotopes is present in largest amount?
O16
O17
O18
All in equal amounts
In which reaction there is no change in the oxidation states?
SO2 + H2S → 2H2O + 3S
2Na + O → Na2O
Na2O2 + H2SO4 → Na2SO4 + H2O
4KCIO3 →3KCIO4 + KCI
Number of hydroxyl groups present in pyrosulphuric acid is
3
4
6
2
H2SO4 has very corrosive action on skin because
It reacts with proteins
It acts as dehydrating agent and absorption of water is highly exothermic
It acts as oxidizing agent
It has bleaching action
Which metal sticks to a glass plate after treatment with ozone
Silver
Mercury
Copper
Lead
Bond angle in O3 molecule is
108o29'
108o28'
116o90'
120o
When H2S is passed through HNO3 solution, the product formed is
Milk of S
Colloidal S
Υ-S
β-S
