Which of the following contains a coordinate covalent bond? MCQ with Answer and Explanation

Which of the following contains a coordinate covalent bond?
A. NH₄⁺
B. Cl₂
C. NaCl
D. NH₃
Answer: Option A
Solution (By JKSSB Mock Tests)
Ammonium ion (NH₄⁺) contains a coordinate bond: NH₃ donates its lone pair of electrons to H⁺ to form a covalent bond where both electrons come from nitrogen. NaCl is ionic, NH₃ has ordinary covalent bonds, Cl₂ has a nonpolar covalent bond. In NH₄⁺, all four N–H bonds are equivalent after formation. Coordinate bond is also called dative bond and is common in complex ions like [Cu(NH₃)₄]²⁺.

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Practice More chemistry Questions

Question #1
Sodium hydroxide is manufactured by:
A. Solvay process
B. Contact process
C. Chlor-alkali process
D. Haber process

Correct Answer: Option C


Explanation:
Chlor-alkali process: electrolysis of concentrated NaCl solution (brine) yields NaOH, Cl₂, and H₂. Solvay process makes Na₂CO₃; Haber for NH₃; Contact for H₂SO₄.

This question belongs to: Science chemistry
Question #2
Which of the following statements is incorrect regarding metallic bonds?
A. They are responsible for the high electrical conductivity of metals.
B. They explain the malleability and ductility of metals.
C. They are highly directional in nature.
D. They involve a sea of delocalized electrons.

Correct Answer: Option C


Explanation:
Metallic bonds are formed by the electrostatic attraction between positive metal ions and a 'sea' of delocalized valence electrons. These bonds are non-directional, which allows the metal ions to slide past one another without breaking the bond, explaining malleability and ductility. Therefore, statement C is incorrect.

This question belongs to: Science chemistry
Question #3
Methane reacts with chlorine in the presence of sunlight to give:
A. Methyl chloride and HCl
B. Carbon tetrachloride
C. Ethane
D. Methanol

Correct Answer: Option A


Explanation:
Methane undergoes substitution reaction with chlorine in UV light: CH₄ + Cl₂ → CH₃Cl + HCl. Further substitution can give CH₂Cl₂, CHCl₃, CCl₄. This is a free radical mechanism. It does not produce methanol or ethane.

This question belongs to: Science chemistry