What do you understand by the terms:
(i) hydrogen economy (ii) hydrogenation (iii) syngas (iv) water gas shift reaction (v) fuel -cell?

What do you understand by the following terms (i) roasting (ii) smelting

What do you understand by the term auto-protolysis of water? What is its significance?

Define and understand the following terms: (i) Phylum (ii) Class (iii) Family (iv) Order (v) Genus

What do you understand by the term chemical reaction? Write any two examples for both exothermic reactions and thermal decomposition reactions.

What do you understand by (i) electron deficient, (ii) electron precise, and (iii) electron rich compounds of hydrogen? Provide justification with suitable examples.

A hydrogen atom in a state of binding energy 0.85 eV makes a transtition to a state of excitation energy of 10.2 eV. (i) What is the initial state of hydrogen atom? (ii) What is the final state of hydrogen atom ? (iii) What is the wavelength of the photon emitted ?

What do you understand by (a) electron-deficient compounds, (b) electron-precise compounds, and (c ) electron - rich compounds of hydrogen? Provfide justification with suitable examples.

Amongst the following compounds, identify which are insoluble, partially soluble and highly soluble in water. (i) phenol (ii) toluene (iii) formic acid (iv) ethylene glycol (v) chloroform (vi) pentanol.

On her vacations Veena visits four cities(A, B, C and D) in random order. What is the probability that she visits (i) A before B? (ii) A before B and B before C? (iii) A fist and B last? (iv) A either first or second? (v) A just before B?