S dissolves in the solution
crystals of R are precipitated
there is no observable change
R and S react to generate heat
Correct answer is B
No explanation has been provided for this answer.
Mg+
K+
CO22-
HCO3
Correct answer is A
Calcium and magnesium ions (particularly calcium) negatively influence cleansing power of detergents, because these form nearly insoluble salts with soap. When the water lathers readily, it means these ions are in negligible concentration in the water.
Starch can be converted to ethyl alcohol by?
distillation
fermentation
isomerization
cracking
Correct answer is B
No explanation has been provided for this answer.
Which of the following are made by the process of polymerization?
Nylon and soap
Nylon and artificial rubber
Soap and butane
Margarine and nylon
Correct answer is B
No explanation has been provided for this answer.
The general formula of an alkyl halide (where X represents the halide) is?
CnH2n 2X
CnH2n + 1X
CnH2n + 2X
CnH2nX
Correct answer is B
No explanation has been provided for this answer.