کیمیائی عملیت

Which metal is the most reactive?

• 1 Copper
• 2 Potassium
• 3 Zinc
• 4 Iron

Which metal reacts with cold water to give hydrogen?

• 1 Sodium
• 2 Gold
• 3 Silver
• 4 Copper

When zinc is added to copper sulphate solution, a displacement reaction occurs because zinc is:

• 1 A noble gas
• 2 Less reactive than copper
• 3 A non-metal
• 4 More reactive than copper

Which of these is the least reactive?

• 1 Sodium
• 2 Calcium
• 3 Gold
• 4 Magnesium

Alkali metals are stored under kerosene oil to:

• 1 Make them heavy
• 2 Prevent reaction with air and moisture
• 3 Keep them cool only
• 4 Make them shiny

Reactivity of halogens down group VIIA:

• 1 Increases
• 2 Stays the same
• 3 First increases then decreases
• 4 Decreases

Which of these metals does not react with dilute hydrochloric acid?

• 1 Zinc
• 2 Copper
• 3 Magnesium
• 4 Iron

Rusting of iron needs:

• 1 Oxygen and water
• 2 Only water
• 3 Only oxygen
• 4 Nitrogen

The metal extracted by electrolysis because it is very reactive is:

• 1 Sodium
• 2 Iron
• 3 Copper
• 4 Gold

A reaction in which a more reactive element replaces a less reactive one is a:

• 1 Decomposition
• 2 Neutralisation
• 3 Displacement reaction
• 4 Combination reaction