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Important Questions Test: Physical & Chemical Changes - Class 7 MCQ


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10 Questions MCQ Test - Important Questions Test: Physical & Chemical Changes

Important Questions Test: Physical & Chemical Changes for Class 7 2024 is part of Class 7 preparation. The Important Questions Test: Physical & Chemical Changes questions and answers have been prepared according to the Class 7 exam syllabus.The Important Questions Test: Physical & Chemical Changes MCQs are made for Class 7 2024 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Important Questions Test: Physical & Chemical Changes below.
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Important Questions Test: Physical & Chemical Changes - Question 1

In which one of the following situations chemical reaction does not occur?

Detailed Solution for Important Questions Test: Physical & Chemical Changes - Question 1

Air and salt are not miscible and will not mix. Therefore no chemical reaction takes place.

Important Questions Test: Physical & Chemical Changes - Question 2

A change in which a substance undergoes a change in its physical properties is called a _______ change.

Detailed Solution for Important Questions Test: Physical & Chemical Changes - Question 2

A physical change is when a substance changes in ways like shape, size, or color but remains the same substance. It can often be reversed, meaning you can change it back to how it was before.

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Important Questions Test: Physical & Chemical Changes - Question 3

State whether the following statement is True or False

Paper undergoing cutting and reassembly represents a chemical change.

Detailed Solution for Important Questions Test: Physical & Chemical Changes - Question 3
  • When you cut a piece of paper into smaller pieces and then try to reassemble them, it is an example of a physical change, not a chemical change.
  • Physical changes are changes that do not alter the substance's identity.
  • In this case, cutting and reassembling paper does not change the paper into a different substance.
  • It is just changing the shape and size of the paper.
Important Questions Test: Physical & Chemical Changes - Question 4

Magnesium oxide is formed by mixing magnesium with _____.

Detailed Solution for Important Questions Test: Physical & Chemical Changes - Question 4

When magnesium reacts with oxygen, it forms magnesium oxide. This reaction creates a new substance called magnesium oxide by combining magnesium with oxygen.

Important Questions Test: Physical & Chemical Changes - Question 5

What happens when you mix vinegar with baking soda?

Detailed Solution for Important Questions Test: Physical & Chemical Changes - Question 5

When you mix vinegar with baking soda, it creates a fizzy sound and you see bubbles coming out. This is because they react together and make something new. It's like a fun science experiment you can try at home!

Important Questions Test: Physical & Chemical Changes - Question 6

When carbon dioxide is passed through lime water, _______ is formed, which makes lime water milky.

Detailed Solution for Important Questions Test: Physical & Chemical Changes - Question 6
  • When carbon dioxide is passed through lime water, calcium carbonate is formed. This makes the lime water look milky.
  • It's like when you mix milk and water together, they create a milky liquid.
  • In this case, mixing carbon dioxide with lime water creates a milky substance called calcium carbonate.
Important Questions Test: Physical & Chemical Changes - Question 7

State whether the following statement is True or False.

The burning of any substance is a chemical change.

Detailed Solution for Important Questions Test: Physical & Chemical Changes - Question 7
  • When something burns, it usually means it's changing into something new. This change is called a chemical change.
  • For example, when you burn a piece of paper, it turns into ash. This transformation from paper to ash is a chemical change because a new substance is formed.
  • So, the statement is TRUE.
Important Questions Test: Physical & Chemical Changes - Question 8
Which of the following statements is true?
Detailed Solution for Important Questions Test: Physical & Chemical Changes - Question 8
Coating iron pipes with zinc prevents them from rusting easily because zinc acts as a protective barrier, preventing iron from reacting with moisture and oxygen. Cutting wood is a physical change, manure formation is a chemical change, and iron and rust are different substances, with rust being an oxide of iron.
Important Questions Test: Physical & Chemical Changes - Question 9

The chemical name of baking soda is _________.

Detailed Solution for Important Questions Test: Physical & Chemical Changes - Question 9

The chemical name of baking soda is sodium hydrogen carbonate (NaHCO₃). It is commonly used in baking and cooking as a leavening agent and also known as sodium bicarbonate.

Important Questions Test: Physical & Chemical Changes - Question 10
What type of change occurs when baking soda is mixed with lemon juice?
Detailed Solution for Important Questions Test: Physical & Chemical Changes - Question 10
Mixing baking soda with lemon juice results in a chemical change. The reaction produces carbon dioxide gas, water, and other substances, indicating the formation of new products.
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