When alkynes are hydrogenated completely they produce compounds with the general molecular formula
CnHn
CnH2n
CnH2n+2
CnH2n-2
Correct answer is C
No explanation has been provided for this answer.
When concentrated sodium chloride solution is electrolysed using inert electrodes, the products are
oxygen and hydrogen
hydrogen and chlorine
sodium and oxygen
sodium and chlorine
Correct answer is B
No explanation has been provided for this answer.
-2 to + 3
-2 to + 6
+6 to +3
+7 to + 6
Correct answer is C
No explanation has been provided for this answer.
Which of the following compounds will leave a metal residue when heated?
Cu(NO3)2
AgNO3
K2CO3
CaCO3
Correct answer is B
No explanation has been provided for this answer.
CuSO45H2O can be obtained from an aqueous solution of copper (ll) tetraoxosulphate (VI) by
evaporation to dryness
using chromatography
precipitation
crystallization
Correct answer is D
No explanation has been provided for this answer.