First column = (14 + 11) x (14 – 11) = 25 x 3 = 75 Second column = (16 + 15) x (16 – 15) = 31 x 1 = 31 First column = (y + 9) x (y – 9) = 88 → y ² – 9 ² = 88 → y ² – 81 = 88 → y ² = 88 + 81 → y ² = 169 → y = 13
The most reactive among the halogens is-
Which of the following is a physical change?
The most reactive among the halogens is-
Formation of ozone hole is maximum over
Which of the following is a physical change?
Alum stops bleeding in minor cuts because of
The gas used for filling weather balloons is-
The important ore of aluminium is-
The acid used in lead storage cells is-
Which metal is extracted from seawater?
