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Neco Chemistry Past Questions and Answers

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Neco Chemistry Past Questions

Question 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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