Consider the following statements about the modern periodic table: 1. Elements are arranged by atomic mass. 2. It has 18 groups and 7 periods. 3. The f-block elements are called inner transition metals. Which are correct? MCQ with Answer and Explanation

Question

Consider the following statements about the modern periodic table: 1. Elements are arranged by atomic mass. 2. It has 18 groups and 7 periods. 3. The f-block elements are called inner transition metals. Which are correct?

A. 1 and 2 only

B. 2 and 3 only

C. 1, 2 and 3

D. 1 and 3 only

Answer: Option B

Solution (By JKSSB Mock Tests)

The modern periodic table is based on atomic number, not atomic mass (Mendeleev's table was based on mass). It consists of 18 vertical groups and 7 horizontal periods. The f-block elements, placed at the bottom, are indeed called inner transition metals (lanthanides and actinides). Thus, statements 2 and 3 are correct.

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Sulphuric acid is known as:

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B. Oil of vitriol

C. Muriatic acid

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Correct Answer: Option B

Explanation:
Sulphuric acid (H₂SO₄) was historically called oil of vitriol. Hydrochloric acid was muriatic acid, nitric acid was aqua fortis, carbolic acid is phenol.

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Which of the following causes ozone depletion?

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Correct Answer: Option A

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Question #3

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Assertion (A): Sodium chloride conducts electricity in its molten state. Reason (R): In the molten state, the ions are free to move and carry charge.

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B. A is true but R is false.

C. A is false but R is true.

D. Both A and R are true but R is NOT the correct explanation of A.

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Correct Answer: Option A

Explanation:
Sodium chloride is an ionic compound. In the solid state, its Na+ and Cl- ions are held tightly in a crystal lattice and cannot move, so it doesn't conduct. When melted, the lattice breaks down, and the ions become mobile. These free-moving ions carry the electric current, making it a good conductor.

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