1) An acid HxA reacts exothermically with an alkali M(OH)y. A series of experiments were performed in which varying volumes of 1 mol/dm3 HxA and 1 mol/dm3 M(OH)y are used with the total volume of solution kept constant. The observed temperature rise was plotted against the percentage by volume of HxA. The results were shown below.
What is the ratio of x : y?
A 1:1 B 2:1 C 2:3 D 3:2
2) Phosphoric (V) acid, H3PO4 can be made from calcium phosphide, Ca3P2 through a series of reactions. Reaction 1: Ca3P2 + 6H2O → 3Ca(OH)2 + 2PH3 Reaction 2: 4PH3 + 8O2 → P4O10 + 6H2O Reaction 3: P4O10 + 6H2O → 4H3PO4
What is the maximum mass of phosphoric (V) acid, H3PO4 that can be made from 91 tonnes of calcium phosphide, Ca3P2?
A 24.5 tonnes B 49.0 tonnes C 73.5 tonnes D 98.0 tonnes
Miracle Learning Centre Answer to Chemistry Tuition Question on Acids, Bases and Salts. (O Level / IP Chemistry)
1)D 2)D
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