CBSE
Which one of the following reactions does not form gaseous product?
PbO2 + H2O2
Acidified KMnO4 + H2O2
PbS + H2O2
Cl2 + H2O2
A hydrogen gas electrode is made by dipping platinum wire in a solution of HCl of pH =10 and by passing hydrogen gas through the platinum wire at 1 atm pressure. The oxidation potential of electrode would be
0.0591 V
0.59 V
0.118 V
0.118 V
When H2O2 is added to ice cold solution of acidified potassium dichromate in ether and the contents are shaken and allowed to stand
a blue colour is obtained in ether because of formation of CrO5
a blue colour is obtained in ether because of formation of CrO3
a blue colour is obtained in ether because of formation of Cr2(SO4)3
chromyl chloride is formed
Which of the following statement about hydrogen is incorrect?
Hydrogen never acts as cation in ionic salts
Hydronium ion, H3O+ exist freely in solution
Dihydrogen does not act as a reducing agent
Dihydrogen does not act as a reducing agent
Some statement about heavy water are given below
A) Heavy water is used as a moderator in nuclear reactors.
B) Heavy water is more associated than ordinary water.
C) Heavy water is more effective solvent than ordinary
A and B
A, B and C
B and C
B and C
Here, Z is
SO3
colloidal sulphur
gaseous sulphur
solid sulphur
The reaction of aqueous KMnO4 with H2O2 in acidic conditions gives.
Mn4+ and O2
Mn2+ and O2
Mn2+ and O3
Mn2+ and O3
In which case is a number of molecules of water maximum?
18 mL of water
0.18 g of water
10-3 mol of water
0.00224 L of water vapours at 1 atm and 273K
Which of the following atomic and physical properties of hydrogen is false?
Hydrogen > Deuterium > Tritium; (melting point/ K)
Hydrogen < Deuterium < Tritium; (boiling point/ K)
Hydrogen < Deuterium < Tritium; (density /gL-1)
Hydrogen > Deuterium > Tritium; (% relative abundance)
Which one of the following molecular hydrides acts as a Lewis acid?
NH3
H2O
B2H6
B2H6