ICSE Class 9th Chemistry 2 – chemical changes and reactions MCQs

If a piece of iron is left exposed to air for some days, we observe that it ____.

Correct! Wrong!

Youtube shikshahouse

When a piece of iron is left in the open for some time, it acquires a brownish coat.

Lime water turning milky is a standard indication for the presence of ____.

Correct! Wrong!

Lime water turning milky is a standard indication for the presence of carbon dioxide gas.

Iron can be prevented from corrosion by alloying iron with ____.

Correct! Wrong!

Iron can be prevented from corrosion by alloying with nickel and chromium.

Which of the following equations represents the reaction between carbon dioxide and lime water?

Correct! Wrong!

When carbon dioxide reacts with lime water, calcium carbonate and water are formed. Carbon dioxide (CO2) + Lime Water [Ca(OH)2] → Calcium Carbonate (CaCO3) + Water (H2O)

The colour of a substance is a chemical property.

Correct! Wrong!

The colour of a substance is a physical property.

The chemical formula of lime water is ____.

Correct! Wrong!

Chemical formula of lime water is Ca(OH)2.

Magnesium burns with a brilliant ____ light.

Correct! Wrong!

Magnesium burns with a brilliant white light.

Which of the following is observed when an iron nail is dropped into a solution of aqueous copper sulphate?

Correct! Wrong!

When a nail is dropped into a solution of aqueous copper sulphate acid and left for half an hour, the colour of the solution turns green.

Fatty foods become rancid due to the process of ____.

Correct! Wrong!

Rancidity is the natural oxidation of fatty foods.

A physical change is reversible.

Correct! Wrong!

A physical change is reversible.

Which of the following does not represent a change?

Correct! Wrong!

Adding kerosene to water is not a change as they do not mix up. In the other cases, either the properties of the components or shapes change.

When we stretch a rubber band, we observe that ____.

Correct! Wrong!

When we stretch a rubber band, its shape changes.

The colour of the substance formed when silver chloride is exposed to sunlight is ____.

Correct! Wrong!

When white coloured silver chloride is exposed to sunlight it changes to gray due to the formation of silver.

When a pinch of baking soda is added to vinegar ____.

Correct! Wrong!

When a pinch of baking soda is added to vinegar, bubbles of a gas come out with a hissing sound.

The chemical reaction in which heat is evolved is called ____ reaction.

Correct! Wrong!

A chemical reaction in which heat is evolved is called an exothermic reaction.

To prevent iron from rusting, iron sheets are dipped in a molten zinc solution. This process is known as ____.

Correct! Wrong!

The process of depositing a thin layer of zinc on iron is called galvanisation.

Copper sulphate is also called ____.

Correct! Wrong!

Copper sulphate is also called blue vitriol.

The gas that is formed when a pinch of baking soda is added to vinegar, turns lime water ____.

Correct! Wrong!

The gas that is formed when a pinch of baking soda is added to vinegar, turns lime water milky.

When a nail is dropped into a solution of aqueous copper sulphate, and removed after half an hour, we observe a ____ on the nail.

Correct! Wrong!

When a nail is dropped into a solution of aqueous copper sulphate, and removed after half an hour, a brown deposit of copper is observed on the nail.

When we cut a piece of paper into four parts and then join the pieces, ____.

Correct! Wrong!

When we cut a piece of paper into four parts and then join the pieces we do not get back the original paper.

When a plate is held over boiling water, then we observe ____ on the lower surface of the plate.

Correct! Wrong!

When a plate is held over boiling water, then we observe water droplets on the lower surface of the plate. The steam from the boiling water condenses on the plate and forms water droplets.

Which of the following is not a physical property of a substance?

Correct! Wrong!

Properties such as shape, size and state are called physical properties.

The change in the colour of a slice of an apple, a potato or a brinjal is a physical change.

Correct! Wrong!

The change in colour appears as a physical change, but it is actually a chemical change. The change in the colour of a slice of an apple, a potato or a brinjal is a chemical change.

Which of the following substances is formed when magnesium oxide is dissolved in water?

Correct! Wrong!

When magnesium oxide is dissolved in water, magnesium hydroxide is formed.

Which of the following substance does not get rusted?

Correct! Wrong!

A tooth brush does not get rusted as it is not made up of iron. Articles made up of iron if left in the open for some days get rusted.

ICSE Class 9th Chemistry 2 - chemical changes and reactions MCQs
Poor

Average

Good

Excellent

Share your Results:

Date
Reviewed Item
ICSE Class 9th Chemistry 2 - chemical changes and reactions MCQs
Author Rating
51star1star1star1star1star