i and ii
i and iii
i and iv
ii and iii
ii and iv
Correct answer is B
No explanation has been provided for this answer.
Which of the following is a neutralization reaction? Addition of
nitric acid to hydrochloric acid
nitric acid to sulphuric acid
nitric acid to distilled water
nitric acid to sodium hydroxide
sodium chloride to distilled water
Correct answer is D
No explanation has been provided for this answer.
20.5
21.0
21.5
22.0
22.5
Correct answer is C
The relative atomic mass will be [(20 * 1) + (3 * 22)] / (4)
(86)/(4) = (43)/(2) = 21.5
decrease, since only a fraction of the water molecules has changed to vapour
remain constant, because the total number of water molecules has not changed
increase, because the water molecules can now reach every part of the sealed tube
decrease, since water boils under reduced pressure
increase, because the water vapour molecules now strike the walls of the tube more frequently because of their increased velocity
Correct answer is E
No explanation has been provided for this answer.
Which of the following bonds exist in crystalline ammonium chloride (NH4Cl)?
Ionic and covalent
Ionic and co-ordinate
Ionic covalent and co-ordinate
Covalent , co-ordinate and metalllic
Ionic, covalent and metallic
Correct answer is C
No explanation has been provided for this answer.