Which of the following shows bonding in silicone?
1.
2.
3.
4.
on polymerisation after hydrolysis forms:
(1)
(2)
(3)
(4) None of these
Among the following substituted silanes the one which will give rise to cross linked silicone polymer on hydrolysis is:
(1)
(2)
(3)
(4)
The most commonly used reducing agent is:
(1)
(2) HF
(3)
(4)
Tin plague is the:
(1) conversion of stannous to stannic
(2) conversion of white tin to grey tin
(3) emission of sound while bending a tin rod
(4) atmospheric oxidation of tin
When chlorine is passed through molten tin, the product obtained is:
(1)
(2)
(3)
(4)
Iodine is decolourised by:
(1)
(2)
(3)
(4)
Addition of excess of sodium hydroxide solution to stannous chloride solution, gives:
(1)
(2)
(3)
(4)
When reacts with , the product formed is-
1.
2.
3.
4. None of the above
The soldiers of the Napolean army while at the Alps during freezing winter suffered a serious problem with regards to the tin buttons of their uniforms. White Metallic tin buttons get converted to grey powder. This transformation is related to-
1. An interaction with water vapour contained in humid air
2. A change in the crystalline structure of tin
3. A change in the partial pressure of in the air
4. An interaction with of air at low temperature