7Class - Science - Changes around Us Test 4

Ascorbic acid is nothing but ____________ vitamin

• A
• B
• C
• D

This is chemical change

• Drying of paint
• breaking of glass
• burning of petrol
• formation of clouds

This is chemical change

• Grinding of wheat
• Boiling of an egg
• Rolling dough into a roti
• cutting of carrot into pieces

This is required for rusting of iron

• Water
• Air
• Heat Energy
• Air and Water

This substance undergoes chemical change on eating

• Iron sulphate
• Iron oxide
• Iron phosphate
• Iron silicate

Magnesium Hydroxide is

• Acidic
• Salt
• Basic
• Neutral

Lime water changes to milky. What type of change is this?

• Physical
• Chemical
• Slow
• Fasr

Ripening of fruits is a __________ change.

• Chemical
• Physical
• Rapid
• No answer

What is the formula of rust?

• FeO
• Fe3O4
• Fe2O3
• FeO2

What will happen if Carbon dioxide is passed to through lime water?

• Lime water turns milky
• Calcium carbonate is formed
• Calcium carbonate is formed and Lime water turns milky
• Nothing will happen