Consider the following statements:
Statement-1: No chemical reaction occurs during the formation of a mixture.
Statement-2: The composition of a mixture may vary.
Statement-3: When iron filings and sulphur powder are heated, a black coloured mixture is formed.
Now, choose the correct option.

Statement-1 and statement-3 are correct but statement-2 is incorrect

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Statement-1 and statement-2 are incorrect but statement-3 is correct

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Statement-2 and statement-3 are correct but statement-1 is incorrect

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Statement-1 and statement-2 are correct but statement-3 is incorrect

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Solution

The correct option is D Statement-1 and statement-2 are correct but statement-3 is incorrect
A mixture is a substance which consists of two or more elements or compounds that are not chemically combined together. It has a variable composition.
The constituents in a mixture can be present in any proportion by mass.
On heating a mixture of iron filings and sulphur powder, a black coloured compound of iron sulphide (FeS) is formed.
Therefore, out of the three statements, only statements-3 is incorrect.
Hence, the correct answer is option (d).

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Which of the given statement(s) is/are correct?

Read the following statements

(i) When a red litmus paper is dipped into reaction mixture of a saponification reaction, it turns blue and the reaction is exothermic.

(ii) When a blue litmus paper is dipped into reaction mixture of a saponification reaction, its colour does not change and the reaction is exothermic

(iii) When a red litmus paper is dipped into reaction mixture of a saponification reaction, its colour does not change and the reaction is endothermic.

(iv) When a blue litmus paper is dipped into reaction mixture of a saponification reaction, its colour does not change and the reaction is endothermic.

Which of the above statements are correct

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Consider the following statements: Statement-1: No chemical reaction occurs during the formation of a mixture. Statement-2: The composition of a mixture may vary. Statement-3: When iron filings and sulphur powder are heated, a black coloured mixture is formed. Now, choose the correct option.

Consider the following statements:
Statement-1: No chemical reaction occurs during the formation of a mixture.
Statement-2: The composition of a mixture may vary.
Statement-3: When iron filings and sulphur powder are heated, a black coloured mixture is formed.
Now, choose the correct option.