Given: R = 8.314 JK-1 mol-1, the work done during combustion of 0.090 kg of ethane (molar mass = 30) at 300 K is
-18.7 kJ
18.7 kJ
6.234 kJ
-6.234 kJ
Potassium dichromate is a good oxidising agent in acidic medium, the oxidation state of chromium changes by
2
3
4
5
What is the possible number of monohydroxy derivatives of a hydrocarbon consisting of five carbon atoms with one methyl group as a branch?
2
3
4
5
Chlorination of ethane is carried out in the presence of
anhydrous AlBr3
mercuric chloride
ultraviolet light
zinc chloride
Electronic configuration of only one p-block element is exceptional. One molecule of that element consists of how many atoms of it?
One
Two
Three
Four
If M, W and V represent molar mass of solute, then mass of solute and volume of solution in litres respectively, which among following equations is true?
For the reaction O3(g) + O(g) → 2O2(g), if the rate law expression is, rate = k [O,][O], the molecularity and order of the reaction respectively are
2 and 2
2 and 1.33
2 and 1
1 and 2
The process in which metal surface is made inactive is called
passivation
galvanising
corrosion
pickling
Which among the following group 15 element forms most stable pentavalent compound?
Phosphorus
Antimony
Bismuth
Arsenic
What is the most abundant element on earth?
Hydrogen
Nitrogen
Oxygen
Silicon
C.
Oxygen
Oxygen is the most abundant element on the earth making up about 47% of the earth's mass. Silicon is the second, making up 28%.