Class 12 Chemistry MCQ – Diazonium Salts Physical Properties

This set of Class 12 Chemistry Chapter 13 Multiple Choice Questions & Answers (MCQs) focuses on “Diazonium Salts Physical Properties”.

1. Aromatic diazonium salts are stable at _____ temperatures.
a) cold
b) room
c) warm
d) high
View Answer

Answer: a
Explanation: Benzenediazonium salts are stable in cold environment, but readily react with water when the temperature increases even slightly.

2. When a blue litmus paper is dipped in an aqueous solution of benzenediazonium bromide, the litmus paper _____
a) turns red
b) turns orange
c) turns black
d) remains unchanged
View Answer

Answer: d
Explanation: Benzenediazonium bromide is a salt, made of a positive diazonium group and a negative bromide ion. Thus, it remains neutral to litmus paper.

3. Benzenediazonium chloride is ______ in water.
a) slightly soluble
b) highly soluble
c) insoluble
d) highly insoluble
View Answer

Answer: b
Explanation: Benzenediazonium chloride is readily soluble in polar solvents like water. However, it is less soluble in solvents like alcohol.

4. Which of the following best describes benzenediazonium chloride?
a) Yellow solid
b) Colourless crystals
c) White powder
d) Oily liquid
View Answer

Answer: b
Explanation: Benzenediazonium chloride is usually obtained in crystal form. It is unstable and formed for a short period when aniline reacts with nitrous acid. It is a salt with chlorine as the negative group and diazo group as positive.

5. Which of the following diazonium salts is insoluble in water?
a) C6H5N2+Cl
b) C6H5N2+Br
c) C6H5N2+HSO4
d) C6H5N2+BF4
View Answer

Answer: d
Explanation: Certain diazonium salts such as fluoroborates are insoluble in water. This makes them stable enough to be dried and stored.
Note: Join free Sanfoundry classes at Telegram or Youtube

6. Which of the following properties is suitable for all diazonium salts?
a) Water soluble
b) Coloured solids
c) Explosive
d) Unreactive
View Answer

Answer: c
Explanation: Diazonium salts are unstable and may explode in dry state. Therefore, they are generally used in solution or aqueous state.

7. Benzenediazonium chloride is commercially available in packaged form.
a) True
b) False
View Answer

Answer: b
Explanation: Because of the highly unstable nature of diazonium salts, they are not commercially available. Instead, they are prepared on demand.

Sanfoundry Global Education & Learning Series – Chemistry – Class 12.

To practice all chapters and topics of class 12 Chemistry, here is complete set of 1000+ Multiple Choice Questions and Answers.


Subscribe to our Newsletters (Subject-wise). Participate in the Sanfoundry Certification contest to get free Certificate of Merit. Join our social networks below and stay updated with latest contests, videos, internships and jobs!

Youtube | Telegram | LinkedIn | Instagram | Facebook | Twitter | Pinterest
Manish Bhojasia - Founder & CTO at Sanfoundry
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.

Subscribe to his free Masterclasses at Youtube & discussions at Telegram SanfoundryClasses.