Science, Prep 3 for 2nd term U1 L1 Chemical reactions Quiz

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Choose:
………… metal doesn't replace the hydrogen of the diluted acids.

Magnesium

silver

zinc

iron

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Choose:
?Which of the following substances doesn't produce black product by thermal decomposition

HgO

2(Cu(OH

CuSO4

CuCO3

3 / 5

Choose :
1- In the oxidation reduction reactions , the number of the lost electrons are ………….. the gained electrons.

More than

less than

equal to

not of all

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Choose:
2- When potassium reacts with diluted hydrochloric acid , hydrogen gas evolves and ………….. salt is formed.

potassium sulphate

potassium nitrate

potassium hydroxide

potassium chloride

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Out true or false:
1- Hydrogen gas evolves when sodium reacts with water.

true

false

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