The valency of aluminium in AlCl₃ is: MCQ with Answer and Explanation

Question
The valency of aluminium in AlCl₃ is:
A. 2
B. 1
C. 3
D. 4
Answer: Option C
Solution (By JKSSB Mock Tests)
In AlCl₃, aluminium combines with three chlorine atoms. Chlorine has a valency of 1 (needs one electron to complete its octet). By the criss-cross method, Al has valency 3 because it loses three electrons to achieve a stable octet (Al³⁺). Thus, the formula is AlCl₃. Aluminium's electronic configuration is 2,8,3, so it loses three valence electrons. Exam tip: Valency equals the number of electrons lost, gained, or shared to complete octet.
This question belongs to: Science chemistry
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Question #1
Which of the following is an example of green chemistry?
A. Using leaded gasoline.
B. Using hydrogen peroxide for bleaching paper.
C. Using chlorine for bleaching paper.
D. Using CFCs as refrigerants.
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Correct Answer: Option B

Explanation:
Green chemistry aims to design products and processes that minimize the use and generation of hazardous substances. Using hydrogen peroxide (H2O2) for bleaching paper is an example of green chemistry because it breaks down into harmless water and oxygen, unlike chlorine which can produce toxic, persistent organochlorine byproducts.
This question belongs to: Science chemistry
Question #2
Hydrochloric acid is present in:
A. Vinegar
B. Gastric juice
C. Orange juice
D. Milk
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Correct Answer: Option B

Explanation:
Gastric juice in the stomach contains hydrochloric acid (HCl) which aids digestion and kills bacteria. Orange juice contains citric acid, vinegar acetic acid, milk lactic acid (from fermentation). The pH of stomach acid is around 1-2.
This question belongs to: Science chemistry
Question #3
Which property increases down a group?
A. Electronegativity
B. Ionization energy
C. Atomic radius
D. Electron affinity
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Correct Answer: Option C

Explanation:
Atomic radius increases down a group due to addition of new shells. Ionization energy, electronegativity, and electron affinity (generally) decrease down a group.
This question belongs to: Science chemistry
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