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Question (41)

QN007401

The formula of copper(II) oxide is:

(A) Cu₂O
(B) CuO
(C) Cu₂O₃
(D) CuO₂

Correct Answer: B

Explanation:

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Question (42)

QN007402

Which formula contains two polyatomic ions?

(A) NaCl
(B) NH₄NO₃
(C) MgO
(D) KBr

Correct Answer: B

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Question (43)

QN007403

Which micro-component promotes deeper understanding through reflection?

(A) Glossary
(B) Index
(C) Pause and Ponder
(D) Appendix

Correct Answer: C

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Question (44)

QN007404

Which Indian scientist mentioned in the chapter is linked with atomic research?

(A) Raja Ramanna
(B) Aryabhata
(C) Hargobind Khurana
(D) Meghnad Saha

Correct Answer: A

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Question (45)

QN007405

The formula of barium chloride is:

(A) BaCl
(B) Ba₂Cl
(C) BaCl₂
(D) Ba₂Cl₃

Correct Answer: C

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Question (46)

QN007406

Which formula correctly represents calcium hydroxide?

(A) CaOH
(B) Ca(OH)₂
(C) CaOH₂
(D) Ca₂OH

Correct Answer: B

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Question (47)

QN007407

The formula of ammonium phosphate is:

(A) NH₄PO₄
(B) (NH₄)₂PO₄
(C) (NH₄)₃PO₄
(D) NH₄₄PO₄

Correct Answer: C

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Question (48)

QN007408

Which ion is responsible for brackets in Al₂(SO₄)₃?

(A) Aluminium ion
(B) Sulfate ion
(C) Oxide ion
(D) Chloride ion

Correct Answer: B

Explanation:

Sulfate is a polyatomic ion repeated three times.

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Question (49)

QN007409

Which formula correctly represents potassium oxide?

(A) KO
(B) K₂O
(C) KO₂
(D) K₂O₃

Correct Answer: B

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Question (50)

QN007410

Chemical formulae are written mainly to show:

(A) Colour of substances
(B) Exact composition of compounds
(C) Temperature of reaction
(D) Physical state only

Correct Answer: B

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