Identify the correct statements:
A. Hydrated salts can be used as primary standard.
B. Primary standard should not undergo any reaction with air.
C. Reactions of primary standard with another substance should be instantaneous and stoichiometric.
D. Primary standard should not be soluble in water.
E. Primary standard should have low relative molar mass.
Choose the correct answer from the options given below:
A. Hydrated salts can be used as primary standard.
B. Primary standard should not undergo any reaction with air.
C. Reactions of primary standard with another substance should be instantaneous and stoichiometric.
D. Primary standard should not be soluble in water.
E. Primary standard should have low relative molar mass.
Choose the correct answer from the options given below:
Show Hint
- A, B and C Only
- A, B, C and E Only
- A, B and E Only
- D and E Only
The Correct Option is C
Solution and Explanation
Step 1: Analyze Statement A.
Hydrated salts can be used as primary standards provided they have a definite and stable composition. Hence, Statement A is correct.
Step 2: Analyze Statement B.
A primary standard must be chemically stable and should not react with air (for example, should not absorb moisture or \( \mathrm{CO_2} \)). Thus, Statement B is correct.
Step 3: Analyze Statement C.
Although reactions involving primary standards should be stoichiometric, they need not always be instantaneous. Therefore, Statement C is incorrect.
Step 4: Analyze Statement D.
A primary standard must be readily soluble in water to prepare solutions accurately. Hence, Statement D is incorrect.
Step 5: Analyze Statement E.
Primary standards should preferably have a low relative molar mass so that weighing errors are minimized. Hence, Statement E is correct.
Step 6: Conclusion.
Correct statements are A, B and E only.
Final Answer: \[ \boxed{\text{A, B and E Only}} \]
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Statement I: In the oxalic acid vs KMnO$_4$ (in the presence of dil H$_2$SO$_4$) titration the solution needs to be heated initially to 60°C, but no heating is required in Ferrous ammonium sulphate (FAS) vs KMnO$_4$ titration (in the presence of dil H$_2$SO$_4$).
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