Gardening is my hobby, I love to do gardening. At front of my reading room, I have a very small garden. I have about 20 flower plants there. I love to see my garden. Last year, I planned to make a garden and read a lot about this. One of my cousins from Delhi, helped a lot in this task. He provided me all the needed information that I need to know before start gardening.
Finally, my father bought me a few plants and I started my garden. Now I have successfully grown a few plants here. I hope that I will increase the size of the garden. I always wanted to have a flower garden, because the flower has a very sweet smell. I have got a plan to grow a few vegetables on aside. I feel refresh when I stay in my garden. Anybody can make his own garden.
12. (a) Alkali metal dissolve in liquid ammonia and form deep blue solution. What is the change in magnetic nature of the solution when sodium is dissolved in ammonia and allowed to stand for some time? (b) Explain why Ba imparts colour in flame but Magnesium does not impart any colour.
The alkali metals dissolve in liquid ammonia giving deep blue solutions which are conducting in nature. The blue colour of the solution is due to the ammoniated electron which absorbs energy in the visible region of light and thus imparts blue colour to the solution. The solutions are paramagnetic.
Weekly income of 600 families is given below. Find the median income Income Frequency 0 - 1000 250 1000 - 2000 190 2000 - 3000 100 3000 - 4000 40 4000 - 3000 15 3
Explanation:Weekly income of 600 families is tabulated below : Weekly income Number of families (in Rs) 0-1000 :250 1000-2000 :190 2000-3000 :100 3000-4000 :40 4000-5000 :15 5000-6000: 5 Total 600 Compute the median income. Cumulative frequency 440 lies in the interval 1000 – 2000. Hence, the median income is Rs. 1263.15.