Project ForgeIdentify which of the following statements are FALSE. (P) Oils with an oleic radical (1 double bond) are more suitable than oils with a linolenic radical (3 double bonds) as film forming vehicles for paints. (Q) Production of synthesis gas from coal and steam is an endothermic process. (R) Use of chlorine for bleaching of wood pulp results in the release of dioxins. (S) In the manufacture of urea from ammonia, the main intermediate product formed is ammonium bicarbonate.
- AP and Q only
- BR and S only
- CQ and R only
- P and S only
Explanation
P is FALSE: for paint drying oils, MORE unsaturation (like linolenic, 3 double bonds) gives better oxidative crosslinking/film formation than less-unsaturated oleic oils — the statement has it backwards. Q is TRUE: coal+steam→CO+H2 (synthesis gas) is endothermic. R is TRUE: chlorine bleaching of pulp is well known to generate dioxins. S is FALSE: the actual intermediate in urea synthesis from ammonia and CO2 is ammonium CARBAMATE, not ammonium bicarbonate. So the false statements are P and S.
Source: GATE CH 2013 (2013)
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