A covalent compound is generally formed between: MCQ with Answer and Explanation

A covalent compound is generally formed between:
A. Two non-metals
B. A metal and a non-metal
C. Two metals
D. A noble gas and a metal
Answer: Option A
Solution (By JKSSB Mock Tests)
Covalent bonds are formed by the sharing of electrons, which typically occurs between two non-metal atoms that have high electronegativities and a tendency to gain electrons. Metals tend to lose electrons, forming ionic bonds with non-metals. Noble gases are generally inert and do not form bonds.

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Practice More chemistry Questions

Question #1
Which of the following is a biofertilizer that fixes atmospheric nitrogen in symbiotic association with legumes?
A. Azospirillum
B. Azotobacter
C. Pseudomonas
D. Rhizobium

Correct Answer: Option D


Explanation:
Rhizobium bacteria form root nodules in leguminous plants (peas, beans, clover) and fix atmospheric N₂ into ammonia, providing nitrogen to the plant, while the plant supplies carbohydrates. Azotobacter and Azospirillum are free-living nitrogen fixers. Pseudomonas is a general soil bacterium. Symbiotic association is mutualistic. Inoculating seeds with Rhizobium culture increases soil fertility.

This question belongs to: Science chemistry
Question #2
Graham's law is applicable to:
A. All states
B. Gases
C. Solids
D. Liquids

Correct Answer: Option B


Explanation:
Graham's law of effusion/diffusion applies to gases. It states that rate is inversely proportional to square root of molar mass. It is used to separate isotopes.

This question belongs to: Science chemistry
Question #3
Who proposed the law of constant composition?
A. Proust
B. Dalton
C. Rutherford
D. Lavoisier

Correct Answer: Option A


Explanation:
Joseph Proust proposed the law of definite proportions (constant composition) – a given compound always contains the same elements in the same proportion by mass. Dalton's theory explained it. Lavoisier gave law of conservation of mass. Rutherford discovered nucleus.

This question belongs to: Science chemistry