A radioactive solid is best stored
under paraffin oil
under ultraviolet light
in a cool, dark cupboard
in a box lined with lead
Correct answer is D
No explanation has been provided for this answer.
Which of the following non-metals reacts most readily with metals?
Nitrogen
Chlorine
Sulphur
Carbon
Correct answer is B
No explanation has been provided for this answer.
Elactrostatic force of attraction between sodium ion and halide ion is greatest in
NaCI
NaBr
NaF
NaI
Correct answer is C
No explanation has been provided for this answer.
Which of the following contains co-ordinate covalent bond?
HCI
CH 4
NH4
Na+CI
Correct answer is C
No explanation has been provided for this answer.
The type of chemical bond that exists between potassium and oxygen in potassium oxide is
ionic
metallic
covalent
dative
Correct answer is A
No explanation has been provided for this answer.