For which element would be a stable species :
(1) C
(2) Si
(3) P
(4) S
The physical property of a hydride of group 16 that decreases down the group is:
1. | Melting point. | 2. | Thermal stability. |
3. | Boiling point. | 4. | Critical temperature. |
Which of the following statements about acid strength is false?
1.
2.
3.
4.
Concentrated nitric acid reacts with iodine to give :
(1)
(2)
(3)
(4)
Thermally most stable compound is :
(1)
(2)
(3)
(4)
Which of the following halogen oxide is used for estimation of carbon monoxide in automobile exhaust gases?
(1)
(2)
(3)
(4)
Only iodine forms hepta-fluoride , but chlorine and bromine give Penta-fluorides. The reason for this is :
(1) low electron affinity of iodine
(2) unusual pentagonal bipyramidal structure of
(3) that the larger iodine atom can accommodate more number of smaller fluorine atom around it
(4) the low chemical reactivity of
Nitrogen gas is liberated by thermal decomposition of :
(1)
(2)
(3)
(4) All
Two oxides of nitrogen, and are allowed to react together at and form a coloured compound of nitrogen (X). When compound (X) reacts with water to yield another compound of nitrogen (Y). The shape of the anion of (Y) molecule is :
(a) triangular planar (b) triangle pyramidal
(c) tetrahedron (d) square planar
Consider the following sequence of reaction.
Identify [Z] gas :