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Neco Chemistry Past QuestionsQuestion 106:The most efficient absorber of ultraviolet radiation in the atmosphere is ____________ A. CO2 B. H2 C. H2O D. 02 E. O3 Question 107:When dust particles collide randomly in a beam of Sunlight, the phenomenon observed is known as ____________ A. Brownian movement. B. Dialysis C. Diffusion D. Osmosis E. Tyndall effect Question 108:\( ^{234}_{90}Th → ^{234}_{91}Pa + X \) In the nuclear reaction above, X is ____________ A. \( ^0_1e \) B. \( ^0_{-1}e \) C. \( ^4_2He \) D. \( ^1_0n \) E. \( ^1_1p\) Question 109:What is the colour of phenolphthalein indicator in a basic medium? A. Blue B. Colourless C. Orange D. Pink E. Yellow Question 110:Which of the following will Increase the rate of reaction of Chips of a metal M as shown in the equation below? M(s)+2HC1(aq) → MCI2 (aq) + H2(g) A. Adding some distilled water B. Decreasing the temperature C. Diluting the hydrochloric acid D. Grinding the metal into powder E. Increasing the pressure |
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