Organic Chemistry Questions and Answers – Acids and Bases

This set of Organic Chemistry Multiple Choice Questions & Answers (MCQs) focuses on “Acids and Bases”.

1. Which one is correctly matched?
a) Acids – pH range above7
b) Acids – pH range below 7
c) Acids – pH range 7(neutral)
d) Acids – pH range 8-9
View Answer

Answers: b
Explanation: Acids have a pH range less than 7, Water is the only solvent that has a pH of 7 (neutral).

2. A Strong acid is same as concentrated acid.
a) False
b) True
View Answer

Answer: a
Explanation: Concentration of an acid depends upon the water content whereas the strength of an acid depends on dissociation power.

3. When an acid reacts with a metal, which one of the following gas is usually liberated?
a) ammonia gas
b) chlorine
c) oxygen
d) Hydrogen gas
View Answer

Answer: d
Explanation: When metal reacts with acid, a soap bubble is formed and the bubble contains Hydrogen gas (example: HCl, H2SO4).

4. Which of the following is wrongly mapped?
a) Sodium carbonate – Washing soda
b) Sodium chloride – common salt
c) Calcium carbonate – slaked lime
d) Sodium hydroxide – caustic soda
View Answer

Answer: c
Explanation: calcium hydroxide is commonly referred as slaked lime.

5. What will be the X in the following equation?
MgO + 2HCl —-> X + H2O
a) Mg2Cl
b) 2MgCl
c) MgCl
d) MgCl2
View Answer

Answer: d
Explanation: MgCl2 is the product formed when magnesium oxide reacts with hydrochloric acid and water is formed as a by-product.
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6. Which of the following is neither an acid nor base?
b) HCl
c) KCl
d) CH3OH
View Answer

Answer: c
Explanation: CH3COOH and CH3OH are organic acids, HCl is strong acid and KCl is a salt.

7. Which one will change from red litmus to blue?
a) NaCl
b) HCl
c) KOH
d) LiOH
View Answer

Answer: b
Explanation: since HCl is a base it turns red litmus to blue.

8. What is the pH of 0.0001 molar HCl solution?
a) 1
b) 2
c) 3
d) 4
View Answer

Answer: d
Explanation: It has a H+ concentration of 10-4. The value of negative exponent(^-4) gives pH value to be 4.

9. What will be the product when HNO3 reacts with NH4OH?
a) NH4 NO3
b) 2NH4 NO3
c) NH4 (NO3)2
d) NH2NO3
View Answer

Answer: a
Explanation: the reaction takes place as follows:
HNO3 + NH4OH —-> NH4NO3 + H2O.

10. Find the odd one out.
a) Neutral salt : NaCl
b) Acid salt : CuSO4.5H2O
c) Basic salt: CuCO3.Cu(OH)2
d) Nonhydrated salt: KNO3
View Answer

Answer: b
Explanation: CuSO4.5H20 is a hydrated salt. An example of acid salt is NaHCO3.

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Manish Bhojasia, a technology veteran with 20+ years @ Cisco & Wipro, is Founder and CTO at Sanfoundry. He lives in Bangalore, and focuses on development of Linux Kernel, SAN Technologies, Advanced C, Data Structures & Alogrithms. Stay connected with him at LinkedIn.

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