Chemistry Test ...

Rate of the chemical reaction: nA → products, is doubled when the concentration of A is increased four times. If the half time of the reaction at any temperature is 16 min, then time required for 75% of the reaction to complete is

Tin and lead can be refined by-

On doubling P and V with constant temperature, the equilibrium constant will

If a transition-metal compound absorbs violet radiation in the visible region, its colour would be

Which is the major product formed when acetone is heated with iodine and potassium hydroxide ?

K_a for the reaction,  Fe ^3 + (aq) + 2H₂O (l) ⇌ Fe (OH)²⁺ (aq) + H₃O + is  6.5 × 10^- 4. What is the maximum pH value which could be used so that at least 80 % of the total iron (III) in a dilute solution exist as Fe³⁺?

The sodium extract of an organic compound on acidification with acetic acid and addition of lead acetate solution gives a black precipitate. The organic compound contains

Hydrogen has an ionisation energy of1311 kJ mo l ⁻¹and for chlorine it is1256 kJ mo l ⁻¹. Hydrogen forms  H⁺(aq) ions but chlorine does not form Cl⁺(aq) ions because

Rank the following compounds in order of decreasing stability.

1. 3-Methyl-1,4-pentadiene

​2. 2-Methyl-1,3-butadiene 

3. 1,3-Hexadiene

​4. 2-Methyl-1,4-pentadiene

The appearance of colour in solid alkali metal halides is generally due to :