Which of the following graphs represents exothermic reaction ?

(a) Only I
(b) Only II
(c) Only III
(d) I and II

Q.

Which of the following is not a polygon?

a) only (iii) b) (ii) and (iii)
c) only (ii) d) (i),(ii) and (iii)

Q.

Question 10

Barium chloride on reacting with ammonium sulphate forms barium sulphate and ammonium chloride. Which of the following correctly represents the type of the reaction involved?

(i) Displacement reaction
(ii) Precipitation reaction
(iii) Combination reaction
(iv) Double displacement reaction

(a) (i) only
(b) (ii) only
(c) (iv) only
(d) (ii) and (iv)

Q. In the given figure, which of the following statements must be true?
(i) a + b = d + c

(ii) a + c + e = 180°

(iii) b + f = c + e

(a) (i) only

(b) (ii) only

(c) (iii) only

(d) (ii) and (iii) only

Q. Which of the following reaction(s) is/are exothermic for the formation of $NaF\left(s\right)$?
I. $N{a}_{\left(g\right)}\to N{a}_{\left(g\right)}^{+}+e^{-}$
II. $F_{\left(g\right)}+e^{-}\to F_{\left(g\right)}^{-}$
III. $N{a}_{\left(g\right)}^{+}+F_{\left(g\right)}^{-}\to Na{F}_{\left(s\right)}$

Q.

Question 10

Barium chloride on reacting with ammonium sulphate forms barium sulphate and ammonium chloride. Which of the following correctly represents the type of the reaction involved?

(i) Displacement reaction
(ii) Precipitation reaction
(iii) Combination reaction
(iv) Double displacement reaction

(a) (i) only
(b) (ii) only
(c) (iv) only
(d) (ii) and (iv)