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Periodic Table: O Level Chemistry Multiple Choice Questions PDF p. 62

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Periodic Table: O Level Chemistry Questions and Answers

1.

First element in periodic table to have 8 valence electrons is

nitrogen
oxygen
fluorine
neon

2.

Soda water (H2CO3(aq)) has a pH of

1
2
3
4

3.

Consider the equation Al2O3 + NaOH + H2O →NaAl(OH)4. Balancing of the equation requires how many moles of NaOH?

1
2
3
4

4.

Chromatography is especially useful for

foods only
drugs only
salt solutions
food and drugs

5.

While plotting decrease in mass against time, a flat curve shows

fastest reaction
reaction is slower
that the reaction is over
that the reaction is endless