Why doesn't the leaning tower of Pisa topple over?

Identify the reaction that doesn't take place during the smelting process of copper extraction

The speed time graph of a particle moving along a fixed direction is as shown in the figure. Obtain the distance travelled by the particle from, (a) t = 0 to 10s (b) t= 2s to 6s (c) What is the average speed of the particle over the intervals in (a) and (b)?

A liquid mixture of benzene and toluene is composed of 1 mol of benzene and 1 mol of toluence. a.If the pressure over the mixture at 300 K is reduced, at what pressure does the first vapour form? b.What is the composition of the first trace of vapour formed? c. If the pressure is reduced further, at what pressure does the last trace of liquid disappear? d.What is the composition of the last trace of liquid? Given:p_(T)@ = 32.05 mm Hg , p_(B)@ = 103 mm Hg

(i) A husband has 46 chromosomes, his wife has 46 chromosomes. Then why don't their offsprings have 46 pairs of chromosomes, which is obtained by the fusion of male and female gametes? (ii) "Geographical isolation is not a major factor in the speciation of a self pollinating plant species." Justify this statement with the help of an example.