Deep blue `CuSO_(4).5H_2O` is converted to a bluish white salt at `100^@C`. At `250^@C` and `750^@C` it is then transformed to a white powder and black material respectively. Identify the salts.

CuSO_(4).5H_(2)O is blue in colour while CuSO_(4) is colourless. Why?

Boiling points of three isomeric pentanes are 36.2^@C ,28^@C and 9.5^@C respectively. Identify the compounds and give reason.

A mixture of benzene & fuming H_2SO_4 is heated at 200-250^@C .

There are 3 bags which are known to contain 2 white and 3 black, 4 white and 1 black, and 3 white and 7 black ball, respectively. A ball is drawn at random from one of the bags and found to the black ball. Then the probability that it was drawn from the bag containing the most black ball is 7//15 b. 5//19 c. 3//4 d. none of these

If at normal pressure and 100^(@)C the changes in enthalpy and entropy for the process, H_(2)O(l)toH_(2)O(g), are DeltaH and DeltaS respectively, then DeltaH-DeltaU is-

A certain salt X, gives the following result. When conc. H_2SO_4 is added to a hot solution of X, white crystal of a acid Z separates out. Write equation for all the above reactions and identify X, Y and Z.

For the process H_2O(i) to H_2O(g) at T = 100^@C and 1 atmospere pressure, the correct choice is

When conc. H_(2)SO_(4) is added to a chloride salt, white fumes are evolved but in the case of iodide salts brown fumes are evolved . This is because -

Urn A contains 1 white, 2 black and 3 red balls, urn B contains 2 white, 1 black and 1 red ball, and urn C contains 4 white, 5 black and 3 red balls. One urn is chosen at random and two balls are drawn. These happen to be one white and one red. What is the probability that they come from urn A ?

Urn A contains 1 white, 2 black and 3 red balls urn B contains 2 white, 1 black and 1 red ball and urn C contains 4 white, 5 black and 3 red balls. One urn is chosen at random and two balls are drawn. These happen to be one white and one red. What is the probability that they come from urnA?