Chemical Technology GATE-1993

Q 1: A bio-degradable detergent is one which,

A) is manufactured using biotechnology
B) contains straight-chain alkyl benzene
C) contains branch chain alkyl benzene
D) is easily decomposed by microorganisms

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Q 2: Hydrogenation of edible oils is done to,

A) decrease the number of unsaturated bond
B) lower the melting point of oil
C) increase the thermal conductivity of oil
D) enable the oil to be packed in tin containers

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Q 3: A fertilizer is rated as 10-12-15. What does it mean?

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Q 4: In the manufacture of sulphuric acid why is the absorption of SO₃ done in concentrated sulphuric acid and not in water?

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Q 5: A dilute solution (20 %) of nitric acid has to be concentrated to 80 %. How is this done in industry and why?

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Q 6: A dilute solution of glycerin contains a soluble calcium salt as an impurity. Why is the removal of calcium essential before the concentration of this solution?  How can this removal be accomplished?

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