Day 48: CBSE Class 10 Science

5 questions (8 parts). Try each one first, then open its answer.

Question 1
Acids, Bases and Salts. This type asked 3 times: 2023, 2025, 2026. This one: 2026
25 $How is a universal indicator obtained ? How is the wide range of pH of solution tested by it ?$
Question 2 (case study, 4 parts)
Acids, Bases and Salts. This type asked 3 times: 2023, 2025, 2026. This one: 2026
The pH plays an important role in our daily life. Strength of acids and bases depends on the number of $\mathrm{H^+}$ ions and $\mathrm{OH^-}$ ions produced by these respectively. pH scale helps in predicting the strength of acids and bases by measuring hydrogen ion concentration in a solution.
28 (a) $What type of indicator is used to predict how strong an acid or base is ?$
28 (b) $\mathrm{H^+}$
28 (c) $What are strong acids and weak acids ?$
28 (c) OR $(i) Under what condition is rainwater called acid rain ? (ii) In the following acids, identify weak acids : Nitric acid, hydrochloric acid, acetic acid, sulphuric acid, formic acid.$
Question 3
Acids, Bases and Salts. This type asked 3 times: 2023, 2024, 2026. This one: 2026
19 $In the following diagram, if acetic acid of same concentration is taken in place of dilute sulphuric acid, then$
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Question 4
Acids, Bases and Salts. This type asked 3 times: 2023, 2025, 2026. This one: 2026
18 $A metal carbonate reacts with a solution X which forms a salt, water and a gas Y. What are X and Y ?$
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Question 5
Carbon and its Compounds. This type asked 3 times: 2022, 2023, 2026. This one: 2026
Two statements are given, one labelled Assertion (A) and the other labelled Reason (R). Select the correct answer from the options given below.
24 $Assertion (A) : There are large number of compounds with many carbon atoms linked to each other. Reason (R) : Carbon-Carbon bond is very strong and stable.$
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Question 1

Question 2 (case study, 4 parts)

Question 3

Question 4

Question 5