CBSE
Multiple Choice QuestionsWhich 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
Which one of the following reactions does not form gaseous product?
PbO2 + H2O2
Acidified KMnO4 + H2O2
PbS + H2O2
Cl2 + H2O2
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
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
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
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
