Ethene reacts with hydrogen bromide to give
CH2Br2
CH3CH2Br
C2H2Br2
CHBr2
Correct answer is B
No explanation has been provided for this answer.
The modern process of manufacturing steel for iron is by
treatment with acids
oxidation
blast reduction
treatment with alkanal
Correct answer is C
No explanation has been provided for this answer.
Chlorine gas turns a damp starch-iodide paper
pink
colourless
red
dark blue
Correct answer is D
No explanation has been provided for this answer.
The metal that liberates hydrogen from cold water in bubbles only is?
Na
K
Ca
Al
Correct answer is C
After a second or so, the calcium metal begins to bubble vigorously as it reacts with the water, producing hydrogen gas, and a cloudy white precipitate of calcium hydroxide.
The salt that will form a precipitate soluble in excess ammonia solution is
Ca(NO3)2
Cu(NO3)2
Mg(NO3)2
Al(NO3)3
Correct answer is B
No explanation has been provided for this answer.