CBSE
Multiple Choice QuestionsDry bleach is done by
O3
H2O2
Cl2
SO2
Red P can be obtained by white P by
Heating it with a catalyst, in an inert atmosphere
Distilling it in an inert atmosphere
Dissolving it in CS2 and crystallizing
Melting it and pouring the liquid into water
Fluorine is the best oxidising agent because it has :
highest electron affinity
highest E
highest E
lowest electron affinity
Which of the following sulphides is yellow in colour?
CuS
CdS
ZnS
CoS
When I2 is passed through KCl, KF and KBr solutions:
Cl2 and Br2 are evolved
Cl2 is evolved
Cl2, Br2 and F2 are evolved
None of the above
NH3 has much higher boiling point than PH3 because
NH3 has larger molecular weight
NH3 undergoes umbrella inversion
NH3 forms hydrogen bond
NH3 contains ionic bonds whereas PH3 contains covalent bonds.
Reaction of HNO3 with I, S, P and C gives respectively
HIO3, H2SO4, H3PO4, and CO2
HIO3, H2SO3, H3PO4, and CO2
HIO2,H2SO4, H3PO4, and CO
I2O5, SO2, P2O, and CO2
The basicity of H3PO4 is
2
3
4
5
Which of the following is anhydride of perchloric acid ?
Cl2O7
Cl2O5
Cl2O3
HClO
Iodine readily dissolves in potassium iodide solution giving
I-
KI-
KI-2
KI3
