Read the following two statements:
Statement I: Potassium dichromate is used in volumetric analysis.
Statement II: \(K_2Cr_2O_7\) is more soluble in water than \(Na_2Cr_2O_7\)
Statement I: Potassium dichromate is used in volumetric analysis.
Statement II: \(K_2Cr_2O_7\) is more soluble in water than \(Na_2Cr_2O_7\)
Show Hint
\(K_2Cr_2O_7\) is preferred as a primary standard in volumetric analysis due to its stability and consistency in aqueous solutions, even though it has lower solubility compared to \(Na_2Cr_2O_7.\)
- Both statements I and II are correct.
- Both statements I and II are incorrect.
- Statement I is correct and II is incorrect
- Statement I is incorrect and II is correct.
The Correct Option is C
Solution and Explanation
Step 1: Understanding the Stability in Aqueous Solution
- K2Cr2O7: Potassium dichromate is more stable in aqueous solution, making it suitable as a primary standard.
- Na2Cr2O7: Sodium dichromate is less stable in water and tends to undergo changes in concentration, making it less suitable as a primary standard.
Conclusion for Statement I: K2Cr2O7 is preferred as a primary standard. Statement I is true.
Step 2: Solubility Comparison
- K2Cr2O7: Less soluble in water compared to Na2Cr2O7.
- Na2Cr2O7: More soluble in water than K2Cr2O7.
Conclusion for Statement II: Statement II is false because K2Cr2O7 is less soluble than Na2Cr2O7.
Final Answer:
Statement I is true, but Statement II is false.
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Concepts Used:
Some Basic Concepts of Chemistry
Chemistry is a vast subject and for understanding its significance we can take help of following points:
- Chemistry plays an important role in understanding various subjects like physics, geology and biology.
- Chemistry is a core branch of science that explains us about the various compositional properties and interaction of matter. It also helps to understand various chemical reactions.
- Chemistry is important in order to understand the behaviour of fertilizers, alkenes, acids, salts, dyes, polymers, drugs, soaps and alloys in organic and inorganic chemistry.
- Chemistry plays an important role in various fields like healthcare, industrial, research, food, and farm activities.
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Classification of Matter
There are two ways of classifying the matter:
(A) Physical Classification:
Matter can exist in three physical states:
- Solids - have definite volume and definite shape
- Liquids - have definite volume but not definite shape.
- Gases - have neither definite volume nor definite shape.
(B) Chemical Classification:
Based upon the composition, matter can be divided into two main types:
- Pure Substances are defined as a single substance (or matter) which cannot be separated by simple physical methods. Pure substances can be further classified as (i) Elements (ii) Compounds
- Mixtures are the combination of two or more elements or compounds which are not chemically combined together and may also be present in any proportion.