HARD
10th CBSE
IMPORTANT
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A student added blue litmus solution to a colourless aqueous solution. The solution turned red. Which one of the following chemicals should be added in excess so that the change in colour is reversed?

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Important Questions on Multiple Choice Questions(MCQ's)

HARD
10th CBSE
IMPORTANT

Aluminium sulphate and copper sulphate solutions were taken in two test tubes I and II respectively. Iron filings were then added to both the solutions. The four students A, B, C and D recorded their observations in the form of a table as given below.
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The correct set of observations have been recorded by the student:

HARD
10th CBSE
IMPORTANT

A student was given three solutions marked X, Y and Z, and asked to arrange them in the increasing order of their pH values. The student put two drops of each solution on three strips of universal indicator paper separately. The colours shown by the three indicator strips are as follows:
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Which of the following gives the correct order of increasing pH values.

EASY
10th CBSE
IMPORTANT
When a strip of pH paper was put in a given solution, the pH paper changed to orange red. The given solution is most likely to be of:
EASY
10th CBSE
IMPORTANT
The test tube I contains Sodium bicarbonate solution whereas test tube II contains lemon juice. On introducing pH paper strips in both solutions, it is observed that pH turns:
MEDIUM
10th CBSE
IMPORTANT
No observable change is noticed when dilute Hydrochloric acid is added to:
MEDIUM
10th CBSE
IMPORTANT

A student took four test tubes I, II, III and IV containing Aluminium sulphate, Copper sulphate, Ferrous sulphate and Zinc sulphate solution respectively. He placed Iron strips in each one of them. After sometime, he found a brown deposit formed in test tube marked:

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MEDIUM
10th CBSE
IMPORTANT

2 mL of Ethanoic acid was taken in each test tube- I & II. A red litmus paper was introduced in test tube I and a pH paper was introduced in test tube II. The experiment was performed by four students A, B, C and D, and they reported their observations as given below:

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The correct set of observations have been recorded by the student:

HARD
10th CBSE
IMPORTANT

Four students A, B, C and D were asked by their teacher to arrange the set-ups I to IV as given below and identify the gas, if any, evolved in each case.

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After observations, the students arrived at the interferences recorded in the following table:

Students I II III IV
A Hydrogen Carbon dioxide Carbon dioxide Hydrogen
B Carbon dioxide Hydrogen No gas Carbon dioxide
C Carbon dioxide Hydrogen Hydrogen No gas
D No gas Carbon dioxide Carbon dioxide Hydrogen

The correct observations and inferences have been reported by the student: