Physical and Chemical Changes - Class 7

Front

The chemical formula for Magnesium Oxide?

Back

MgO

Front

Name the solution? Options: Iron Sulphate Solution, Iron sulphate solution, Iron Sulfate

Back

Iron Sulphate Solution, Iron sulphate solution, Iron Sulfate

Front

Which of the following is only a physical change?

• Rusting of Iron
• Combustion of Magnesium Ribbon
• Burning of Candle
• Melting of wax

Back

Melting of wax

Front

Why does rusting of ships occur?

Back

The water of the sea contains salt

Front

Which of the following processes is used to prevent articles from rusting?

• Crystallization
• Digestion
• Galvanization
• Magnetic Effect

Back

Galvanization

Front

What is stainless steel mixed with so that it does not rust?

Back

Iron

Front

Change of natural rubber latex to rubber sheet is a physical change. (True/False)

Back

False

Front

Which one of the following is a chemical change?

• Twinkling of stars
• Cooking of vegetables
• Cutting of roots
• Boiling of water

Back

Cooking of vegetables

Front

Crystallization is a process to obtain -

Back

Pure solids

Front

Equation for reaction between carbon dioxide and lime water:

Back

Carbon Dioxide + Lime Water = Calcium Carbonate