How many of the following reactions or processes is-are exothermic -i 2Hg - H2gii Cdiamond - Cgraphiteiii CH4 - O2- CO2 - H2Oiv C2H6- C2H4g - H2gv cis-2-butene - trans-2-butenevi white P - red P-vii H2Ol - H2Osviii Na-g - aq - Na-aqix NaOH - H2SO4- Na2SO4 - H2Ox HNO3 - water - Solution-xi ethanol - water - Solution-

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Standard XII

Chemistry

Preparation of Haloalkanes from Alcohol

How many of t...

Question

How many of the following reactions or processes is/are exothermic ?
(i) $2 H (g) \to H_{2} (g)$
(ii) $C (d i a m o n d) \to C (g r a p h i t e)$
(iii) $C H_{4} + O_{2} \to C O_{2} + H_{2} O$
(iv) $C_{2} H_{6} \to C_{2} H_{4} (g) + H_{2} (g)$
(v) $c i s - 2 - b u t e n e \to t r a n s - 2 - b u t e n e$
(vi) $w h i t e P \to r e d P .$
(vii) $H_{2} O (l) \to H_{2} O (s)$
(viii) $N a^{+} (g) + a q \to N a + (a q)$
(ix) $N a O H + H_{2} S O_{4} \to N a_{2} S O_{4} + H 2 O$
(x) $H N O_{3} + w a t e r \to S o l u t i o n$ .
(xi) $e t h a n o l + w a t e r \to S o l u t i o n .$

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Solution

(i, ii, iii, v, vi, vii, viii, ix, x)

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