Chemistry: Inorganic Chemistry: UPSC Previous Year Questions (Science and Technology)
1 previous year UPSC Prelims question on Chemistry: Inorganic Chemistry (Science and Technology). Choose an option to see the answer and explanation.
Explanations state facts as of the year each question was asked; words like “recently” refer to that year.
Showing 1–1 of 1 question
UPSC 2002Science and Technology · Chemistry: Inorganic Chemistry
Q1. Assertion(A): Synthetic detergents can lather well in hard water. Reason (R): Synthetic detergents form soluble calcium and magnesium salts with hard water.
Explanation
Assertion (A) is true: Synthetic detergents, unlike soap, work efficiently in hard water because they do not form insoluble scum with calcium and magnesium ions, which are present in hard water. This enables better lathering. Reason (R) is true: Synthetic detergents are mainly non-ionic or anionic, allowing them to form soluble complexes with calcium and magnesium ions, preventing scum formation. Unlike soap, which forms insoluble salts, these detergents continue to lather in hard water. Reason (R) correctly explains Assertion (A) because synthetic detergents form soluble complexes with calcium and magnesium, preventing scum and aiding lathering in hard water. Direction: The following item consists of two statements. One labeled as the ‘Assertion (A)’ and the other as "Reason (R)". You have to answer this item using the code given below:
Answer key for these questions
Q
UPSC year
Correct answer
1
2002
(a) Both A and R are individually true and R is the correct explanation of A
Frequently asked questions
How many previous year UPSC questions are there on Chemistry: Inorganic Chemistry?
This page covers 1 previous year UPSC Prelims GS Paper-I questions on Chemistry: Inorganic Chemistry (Science and Technology), asked from 1996 to 2008. Each has the correct answer and an explanation.
How should I use previous year UPSC questions for Prelims?
Attempt each question first, then open the answer and read the explanation for every option. Repeat by chapter, and track which statements UPSC reuses across years. Previous year questions show the exam pattern and difficulty level.
Which years are covered for Chemistry: Inorganic Chemistry?
Questions on Chemistry: Inorganic Chemistry (Science and Technology) are available for 11 years, from 1996 to 2008. Use the Year filter to practise a single paper.
