Water is said to be 'hard' if it
easily forms ice
has to be warmed before sodium chloride dissolves in it
froms an insoluble scum with soap
contains nitrates
contains sodium ions
Correct answer is C
No explanation has been provided for this answer.
Nitrogen can best be obtained from a mixture over oxygen and nitrogen by passing the mixture over
potassium hydroxide
heated gold
heated magnesium
heated phosphorus
calcium chloride
Correct answer is D
No explanation has been provided for this answer.
N10.00
N27.00
N44.44
N66.67
N33.33
Correct answer is D
No explanation has been provided for this answer.
dissolve marble to liberate CO
have a PH less than 7
Turn blue litmus red
neutralize alkalis to form salt
react with magnesium to liberate hydrogen
Correct answer is A
No explanation has been provided for this answer.
Which of the following statements is INCORRECT?
Fractional distillation of crude petroleum will give the folloing hydrocarbon fuels in order of increasing boiling point
Butane < petrol < kerosene of polythene.
Both but-1-ene and but-1-yne will decolorize bromine readily
but-2-ene will react with chlorine to form 2,3-dichlorobutane
calcuim carbide will react with water to form any alkyne
Correct answer is E
No explanation has been provided for this answer.