The limiting friction of a body independent of its ……………………
25. A body of mass M falls from a height H1 to a height H2, above the ground (H1>H2). Then, the loss in its potential energy is given by ____.A) Mg(H1−H2)B) Mg(H1+H2)C) Mg(H2−H1)D) Mg(H1.H2)
Hydrogen sulphide (H2S) is a strong reducig agent. Which of the following reactions shows its reducing action
(a) Cd(NO3)2+ H2S --------- CdS+ 2HNO3 (b) CuSO4+ H2S ------------ CuS + H2SO4 (c) 2FeCl3+ H2S ------------ 2FeCl2+ 2HCl + S (d) Pb(NO3)2 + H2S ---------- PbS + 2CH3COOH