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
Heavy water is
CaSO4
water contain CaSO4, MgSO4
D2O
water contain CaCO3
C.
D2O
D2O is called heavy water. It is used as moderator in nuclear reactor.
The number of moles of oxygen obtained by the electrolytic decomposition of 108 g water is
2.5
3
5
7.5
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.
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
Hardness of water is due to presence of salts of:
Na+ and K+
Ca2+ and Mg2+
Ca2+ and K+
Ca2+ and Na+
H2O is liquid while H2S is a gas due to
covalent bonding
molecular attraction
H-bonding
both H-bonding and molecular attraction
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