To make a saturated solution, 36 g of sodium chloride is dissolved in 100 g of water
at 293 K. Find its concentration at this temperature.
Differentiate between homogen eous and heterogeneous mixtures with examples.
List the points of differences
between homogeneous and
heterogeneous mixtures.
The following is the cumulative frequency distribution (of less than type) of 1000 persons each of age 20 years and above. Determine the mean age.
At a fete, cards bearing numbers 1 to 1000, one number on one card, are put in a box. Each player selects one card at random and that card is not replaced. If the selected card has a perfect square greater than 500, the player wins a prize. What is the probability that
(i) the first player wins a prize?(ii) the second player wins a prize, if the first has won?
A bag contains 24 balls of which x are red, 2x are white and 3x are blue. A ball is selected at random. What is the probability that it is
(i) not red? (ii) white?
A lot consists of 48 mobile phones of which 42 are good, 3 have only minor defects and 3 have major defects. Varnika will buy a phone if it is good but the trader will only buy a mobile if it has no major defect. One phone is selected at random from the lot. What is the probability that it is
(i) acceptable to Varnika?(ii) acceptable to the trader?
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