Which of the following is an electrovalent compound? MCQ with Answer and Explanation

Question
Which of the following is an electrovalent compound?
A. CCl₄
B. KCl
C. CO₂
D. CH₄
Answer: Option B
Solution (By JKSSB Mock Tests)
KCl (potassium chloride) is an ionic (electrovalent) compound formed by transfer of one electron from K to Cl, giving K⁺ and Cl⁻ ions held by electrostatic attraction. CH₄, CCl₄, CO₂ are covalent compounds with electron sharing. Electrovalent compounds have high melting points, conduct electricity in molten/aqueous state, and are generally soluble in water.
This question belongs to: Science chemistry
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Practice More chemistry Questions

Question #1
Petroleum refining involves:
A. Electrolysis
B. Crystallization
C. Sublimation
D. Fractional distillation
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Correct Answer: Option D

Explanation:
Crude oil is separated into fractions (petrol, kerosene, diesel, etc.) based on boiling points by fractional distillation. Cracking, reforming are secondary processes.
This question belongs to: Science chemistry
Question #2
Which group of elements is known as halogens?
A. Group 18
B. Group 17
C. Group 2
D. Group 1
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Correct Answer: Option B

Explanation:
Group 17 (F, Cl, Br, I, At) are halogens (salt formers). They have 7 valence electrons, high electronegativity, and are highly reactive non-metals. Group 1 are alkali metals, 18 noble gases, 2 alkaline earth metals.
This question belongs to: Science chemistry
Question #3
The modern periodic table is based on the:
A. Atomic number of the elements
B. Density of the elements
C. Number of neutrons
D. Atomic mass of the elements
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Correct Answer: Option A

Explanation:
The modern periodic law states that the physical and chemical properties of elements are periodic functions of their atomic numbers. This was proposed by Henry Moseley, correcting Mendeleev's periodic table which was based on atomic mass. Atomic number determines the electronic configuration and thus chemical properties.
This question belongs to: Science chemistry
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