11.

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?

• $\mathrm{\pi } = \frac{\mathrm{MWR}}{\mathrm{TV}}$

• $\mathrm{\pi } = \frac{\mathrm{TMR}}{\mathrm{WV}}$

• $\mathrm{\pi } = \frac{\mathrm{TWR}}{\mathrm{VM}}$

• $\mathrm{\pi } = \frac{\mathrm{TRV}}{\mathrm{WM}}$

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