Question

	Column I		Column II
a.	the amount of energy which must be invested in reaction to get it started	p.	chemical equilibrium
b.	a state in which the rate of forward reaction is exactly equal to the rate of the reverse reaction.	q.	activation energy
c.	a process or reaction which consumes heat	r.	endothermic
d.	a process or reaction that releases heat.	s.	exothermic
		t.	threshold energy

• A. $(a\to t)$
  $(b\to q)$
  $(c\to s)$
  $(d\to r)$
• B. $(a\to q)$
  $(b\to p)$
  $(c\to r)$
  $(d\to s)$
• C. $(a\to t)$
  $(b\to p)$
  $(c\to s)$
  $(d\to r)$
• D. $(a\to s)$
  $(b\to r)$
  $(c\to q)$
  $(d\to p)$

Answer 1

Answer: (B)

$(a\to q)$

$(b\to p)$
$(c\to r)$
$(d\to s)$
$(a\to q)$ To initial reaction, activation energy must be invested.
$(b\to p)$
$(c\to r)$ In endothermic reaction $(\Delta Hor\Delta U=+ve)$ heat absorbed by system.
$(d\to s)$ In exothermic reaction $(\Delta Hor\Delta U=-ve)$ heat releases out from system to surroundings.