CBSE
Presence of phosphoric acid or glycerine or acetanilide retards the decomposition of H2O2 .This is an example of:
Positive catalysis.
Negative catalysis.
Auto catalysis.
Induced catalysis.
H2O is liquid while H2S is a gas due to
covalent bonding
molecular attraction
H-bonding
both H-bonding and molecular attraction
For binary hydrides of formula M x n the value of n can be fractional for:
salt like hydrides
interstitial hydrides
covalent hydrides
polymeric hydrides
Heavy water is
CaSO4
water contain CaSO4, MgSO4
D2O
water contain CaCO3
The most probable velocity (in cm/s) of hydrogen molecule at 27C will be
19.3 x 104
17.8 x 104
24.93 x 109
17.8 x 108
Hardness of water is due to presence of salts of:
Na+ and K+
Ca2+ and Mg2+
Ca2+ and K+
Ca2+ and Na+
The number of moles of oxygen obtained by the electrolytic decomposition of 108 g water is
2.5
3
5
7.5
The oxide that gives H2O2 on treatment with dilute acid is
PbO2
MnO2
Na2O2
TiO2
Hydrogen peroxide when added to a solution of potassium permangnate acidified with sulphuric acid:
Acts as an oxidising agent
Acts as a reducing agent
Forms water only
Forms water only
The reaction of HBr with in the presence of peroxide will give
CH3CH2CH2CH2Br