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
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. State true or false
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
d) Hydrogen gas
Explanation: When metal reacts with acid, a soap bubble is formed and the bubble contains Hydrogen gas (example: HCl, H2SO4).
4. Select the one which is wrongly mapped
a) Sodium carbonate – Washing soda
b) Sodium chloride – common salt
c) Calcium carbonate – slaked lime
d) Sodium hydroxide – caustic soda
Explanation: calcium hydroxide is commonly referred as slaked lime.
5. MgO + 2HCl —-> X + H2O
Explanation: MgCl2 is the product formed when magnesium oxide reacts with hydrochloric acid and water is formed as a by-product.
6. Select the one which is neither an acid nor base
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?
Explanation: since HCl is a base it turns red litmus to blue.
8. What is the pH of 0.0001 molar HCl solution?
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
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
Explanation: CuSO4.5H20 is a hydrated salt. An example of acid salt is NaHCO3.
Sanfoundry Global Education & Learning Series – Organic Chemistry.
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