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Question (41)

QN007351

The formula of calcium chloride is:

(A) CaCl
(B) Ca₂Cl
(C) CaCl₂
(D) Ca₂Cl₂

Correct Answer: C

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Question (42)

QN007352

Which electronic configuration belongs to an atom with valency 3?

(A) 2,8,1
(B) 2,8,2
(C) 2,5
(D) 2,8,3

Correct Answer: D

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Question (43)

QN007353

Which micro-component encourages scientific thinking beyond direct facts?

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

Correct Answer: B

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Question (44)

QN007354

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

(A) Raja Ramanna
(B) Aryabhata
(C) Jagadish Chandra Bose
(D) Srinivasa Ramanujan

Correct Answer: A

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Question (45)

QN007355

The valency of phosphorus with configuration 2,8,5 is:

(A) 1
(B) 2
(C) 3
(D) 5

Correct Answer: C

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Question (46)

QN007356

Which compound contains ions Ca²⁺ and O²⁻?

(A) CaO
(B) Ca₂O
(C) CaO₂
(D) Ca₂O₂

Correct Answer: A

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Question (47)

QN007357

The total number of electrons gained by oxygen to complete octet is:

(A) 1
(B) 2
(C) 6
(D) 8

Correct Answer: B

Explanation:

Oxygen has 6 valence electrons and gains 2 more.

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Question (48)

QN007358

Which formula is correctly balanced using valencies?

(A) NaCl₂
(B) MgCl
(C) Al₂O₃
(D) Ca₂O₃

Correct Answer: C

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Question (49)

QN007359

Covalent compounds are generally formed between:

(A) Metals only
(B) Non-metals only
(C) Metals and noble gases
(D) Metals only with hydrogen

Correct Answer: B

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Question (50)

QN007360

Atoms combine mainly to attain:

(A) Higher temperature
(B) Stable electronic configuration
(C) Greater mass
(D) Radioactivity

Correct Answer: B

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