School Olympiads - National Science Olympiad (NSO)

Acids, Bases, Salts & Chemical Indicators question bank (Class 7 & 8 - Applied Physics, Chemistry & Biology)

Practice 4 free School Olympiads - National Science Olympiad (NSO) Class 7 & 8 - Applied Physics, Chemistry & Biology - Acids, Bases, Salts & Chemical Indicators questions with answers and step-by-step solutions.

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Q1.

A student tests three unknown solutions P, Q, and R with phenolphthalein and blue litmus paper:
• Solution P turns phenolphthalein pink.
• Solution Q turns blue litmus red.
• Solution R produces no colour change on either indicator.
Which of the following correctly identifies P, Q, and R?

(A)

{'key': 'A', 'text': 'P is Acid, Q is Base, R is Salt'}

(B)

{'key': 'B', 'text': 'P is Base, Q is Acid, R is Neutral'}

(C)

{'key': 'C', 'text': 'P is Neutral, Q is Acid, R is Base'}

(D)

{'key': 'D', 'text': 'P is Base, Q is Neutral, R is Acid'}

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Q2.

A body of mass $6\text{ kg}$ moves under a constant force of $40\text{ N}$ in a laboratory experiment on Acids, Bases, Salts & Chemical Indicators. What is the acceleration produced in $\text{m/s}^2$?

(A)

{'key': 'A', 'text': '6 m/s²'}

(B)

{'key': 'B', 'text': '12 m/s²'}

(C)

{'key': 'C', 'text': '9 m/s²'}

(D)

{'key': 'D', 'text': '4 m/s²'}

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