About 5 mL of dilute hydrochloric acid is taken in a test tube. To this, a few pieces of granulated zinc are added. Which of the following is true?

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Important Questions on Is Matter Around Us Pure?

MEDIUM

9th CBSE

IMPORTANT

LIVING SCIENCE CHEMISTRY 9>Chapter 2 - Is Matter Around Us Pure?>EXERCISES>Q A

Two chemical species A and B combine to form C which contains both A and B. A and B cannot be broken down into simpler substances by simple chemical reactions.
A + B → C
Which of the following are correct?
i. C has a fixed composition
ii. A and B are elements
iii. A and B are compounds
iv. C is a compound.

HARD

9th CBSE

IMPORTANT

LIVING SCIENCE CHEMISTRY 9>Chapter 2 - Is Matter Around Us Pure?>EXERCISES>Q A

Two substances

X

and

Y

react to form a new substance

X_{2} Y

according to the following equation:

2 X + Y \to X_{2} Y

Which of the following are incorrect?
i. The product formed is an element.
ii. The product cannot be classified as a compound.
iii. The product will always have a fixed composition.
iv.