Section A
Q1. Round the following answers so that only significant figures are obtained:
(a)
(i) 2.4 + 0.010 + 6.24 = 8.65
(ii) 3.6 - 0.020 - 5.14 = -1.56
(iii) (22 × 5.42) ÷ 100.0 = 1.19
(iv) log 5.000 × 10-4 = -3.3010299
(v) Antilog 12.5 = 3.1622277 × 1012
(b) Particle diameter of stationary phase plays a critical role in chromatographic separations. Comment.
(c) Draw and state schematic diagram of non-dispersive IR photometer for monitoring CO in the air sample.
(d) Sketch the thermobalance used in TGA showing its key components.
(e) In X-ray fluorescence technique, matrix effects interfere in sample analysis. Comment and justify your answer.
(f) Describe three ways of introducing a sample into an ICP torch.
(g) How does CaCl2 transform into excited Ca0^* during process occurring in flame? Show schematically.
(h) How will you determine chromium ions spectrophotometrically in a mineral sample?
