Hg2O
HgO2
HgO2
HgO
None of the above
Correct answer is E
Various oxides of mercury: Mercury(I) oxide (mercurous oxide), Hg\(_2\)O. Mercury(II) oxide (mercuric oxide), HgO.
No specific oxide of mercury is refered in the question.
90cm3
100cm3
105cm3
110cm3
115cm3
Correct answer is C
2CO(g) + O2(g) ---> 2CO\(_2\)(g)
2vol 1vol 2vol
Volume in cm\(^3\) Before sparking: 10 // 21
Volume in cm\(^3\) On sparking 10 // 5 // 10
Volume in cm\(^3\) After sparking: 0// 16 // 10
Total volume of resulting gas = Volume of [excess oxygen + CO\(_2\) produced + unreactive components]
= 16 + 10 + 79 → 105cm\(^3\)
Ag+ion
Pb2+ion
Pb4+ion
Zn2+ion
Al3+ion
Correct answer is B
No explanation has been provided for this answer.
The alloy duralumin is used for the building of aeroplanes because it?
asborbs heat readily from sure thereby preventing the inside of the plane from getting cold at high attitudes
reflects sunlight readily, thereby keeping the inside of the plane cool
is extremely durable and possesses reflective ability
is easily the lightest building material
possesses both strenght and lightness
Correct answer is E
No explanation has been provided for this answer.
Fractional distillation
crystallization
Filtration followed by evaporation
Evaporation followed by sublimation
Filtration followed by sublimation
Correct answer is D
No explanation has been provided for this answer.