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GS
GS Set-1
Chemistry
Physical Chemistry
230

Physical Chemistry MCQ with Answers

230) Solution of which of the following will have maximum pH value?

NaCl

Na₂CO₃

NH₄Cl

NaHCO₃

Answer is:

Na₂CO₃

Explanation:

Na2CO3 is the most basic. The pH scale ranges from 0 to 14, with 7 being neutral. pHs less than 7 are acidic while pHs greater than 7 are alkaline (basic). A pH meter is an instrument used to measure acidity or alkalinity of a solution - also know as pH.

Solution of which of the following will have maximum pH value?

Physical Chemistry MCQ with Answers

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231) A precipitate will be obtained on mixing equal volumes of which of the following solutions, if K_sp = 1.8 x 10⁻¹⁰?

10⁻⁴M [Ag⁺] and 10⁻⁴ [Cl⁻]

10⁻⁵M [Ag⁺] and 10⁻⁵ [Cl⁻]

10⁻⁶M [Ag⁺] and 10⁻⁶ [Cl⁻]

10⁻¹⁰M [Ag⁺] and 10⁻⁴ [Cl⁻]

Answer is:

10⁻⁴M [Ag⁺] and 10⁻⁴ [Cl⁻]

Explanation:

Ionic product > Solubility product, therefore precipitation will take place.

232) Which of the following are present in an aqueous solution of Na₂CO₃?

H₂CO₃, Na⁺, OH⁻

H₂CO₃, OH⁻

CO₃²⁻ ion

Na⁺ and OH⁻ ions

Answer is:

H₂CO₃, Na⁺, OH⁻

233) Why is NH₄Cl added before NH₄OH in qualitative analysis of third group ions?

To increase concentration of OH⁻

To decrease concentration of OH⁻

To make solution dilute

For pure precipitation

Answer is:

To decrease concentration of OH⁻

Explanation:

Due to common ion effect.

234) What is the volume needed to make normality of the solution 3N, prepared by mixing 250 mL 6M HCl and 350 mL 8M HNO₃?

833.3 mL

933.3 mL

1000 mL

500 mL

Answer is:

833.3 mL

Explanation:

N₁V₁ + N₂V₂ = N₃V₃

Physical Chemistry MCQ with Answers

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230) Solution of which of the following will have maximum pH value?

Na2CO3

Physical Chemistry MCQ with Answers

Related Physical Chemistry MCQ with Answers

231) A precipitate will be obtained on mixing equal volumes of which of the following solutions, if Ksp = 1.8 x 10−10?

10−4M [Ag+] and 10−4 [Cl−]

232) Which of the following are present in an aqueous solution of Na2CO3?

H2CO3, Na+, OH−

233) Why is NH4Cl added before NH4OH in qualitative analysis of third group ions?

To decrease concentration of OH−

234) What is the volume needed to make normality of the solution 3N, prepared by mixing 250 mL 6M HCl and 350 mL 8M HNO3?

833.3 mL

Physical Chemistry MCQ with Answers

Na₂CO₃

231) A precipitate will be obtained on mixing equal volumes of which of the following solutions, if K_sp = 1.8 x 10⁻¹⁰?

10⁻⁴M [Ag⁺] and 10⁻⁴ [Cl⁻]

232) Which of the following are present in an aqueous solution of Na₂CO₃?

H₂CO₃, Na⁺, OH⁻

233) Why is NH₄Cl added before NH₄OH in qualitative analysis of third group ions?

To decrease concentration of OH⁻

234) What is the volume needed to make normality of the solution 3N, prepared by mixing 250 mL 6M HCl and 350 mL 8M HNO₃?