The pH of rain water collected from two cities A and B were found to be 6 and 5 respectively. The water of which city is more acidic ?

If pH of rain water is less than 5.6, it is called___

If the pH values of solutions X, Y and Z are 13, 6 and 2 respectively then which solution· is a strong acid ? Why ?

2 solution A and B have pH value of 5 and 8 respectively which solution will be the basic in nature?

Three water samples namely river water, untreated sewage water and secondary effluent discharged from a sewage treatment plant were subjected to BOD test. The samples were labelled A, B and C, but the laboratory attendant did not note which was which. The BOD values of the three samples A, B and C were recorded as 20mg/L, 8mg/L and 400mg/L, respectively. Which sample of the water is most polluted? Can you assign the correct label to each assuming the river water is relatively clean?

If the length of the tangent from two points A,B to a circle are 6,7 respectively. If A,B are conjugate points then AB=

Two finite sets A and B have n and 2 elements respectively. The total number of relations from A to B is 240 more than the total number of functions from A to B.

The BOD values of four samples of water A,B,C and D are 165 ppm. 120ppm, 20ppm and 5ppm respectively . The most polluted and least polluted water sample are