Question:
Identify the correct statements from the following:
\[
(I)\ \text{The formula of Calgon is }Na_6(PO_3)_6
\]
\[
(II)\ \text{Exhausted permutit is regenerated by aqueous }KCl\text{ solution}
\]
\[
(III)\ \text{Calcium stearate is soluble in water}
\]
\[
(IV)\ \text{In ice crystals, each oxygen is surrounded by four oxygen atoms}
\]
Identify the correct statements from the following:
\[ (I)\ \text{The formula of Calgon is }Na_6(PO_3)_6 \] \[ (II)\ \text{Exhausted permutit is regenerated by aqueous }KCl\text{ solution} \] \[ (III)\ \text{Calcium stearate is soluble in water} \] \[ (IV)\ \text{In ice crystals, each oxygen is surrounded by four oxygen atoms} \]
\[ (I)\ \text{The formula of Calgon is }Na_6(PO_3)_6 \] \[ (II)\ \text{Exhausted permutit is regenerated by aqueous }KCl\text{ solution} \] \[ (III)\ \text{Calcium stearate is soluble in water} \] \[ (IV)\ \text{In ice crystals, each oxygen is surrounded by four oxygen atoms} \]
Show Hint
Remember:
\[
\text{Calgon }=Na_6(PO_3)_6
\]
and exhausted permutit is regenerated using brine solution:
\[
NaCl
\]
Also, ice has a tetrahedral hydrogen-bonded structure.
Updated On: Jun 24, 2026
- III & IV only
- I & IV only
- I & III only
- II & III only
Show Solution
Verified By Collegedunia
The Correct Option is B
Solution and Explanation
Step 1: Check statement (I).
Calgon is sodium hexametaphosphate whose formula is \[ Na_6(PO_3)_6 \] Hence, statement (I) is correct.
Step 2: Check statement (II).
Exhausted permutit used in water softening is regenerated using concentrated sodium chloride solution: \[ NaCl \] It is not regenerated using \[ KCl \] Hence, statement (II) is incorrect.
Step 3: Check statement (III).
Calcium stearate is a soap-like compound and is insoluble in water.
Therefore, statement (III) is incorrect.
Step 4: Check statement (IV).
In the crystal structure of ice, each oxygen atom forms hydrogen bonds with four neighboring oxygen atoms in a tetrahedral arrangement.
Hence, statement (IV) is correct.
Step 5: Identify the correct statements.
The correct statements are: \[ (I)\ \text{and}\ (IV) \]
Step 6: Final conclusion.
Therefore, the correct answer is \[ \boxed{\text{I \& IV only}} \]
Calgon is sodium hexametaphosphate whose formula is \[ Na_6(PO_3)_6 \] Hence, statement (I) is correct.
Step 2: Check statement (II).
Exhausted permutit used in water softening is regenerated using concentrated sodium chloride solution: \[ NaCl \] It is not regenerated using \[ KCl \] Hence, statement (II) is incorrect.
Step 3: Check statement (III).
Calcium stearate is a soap-like compound and is insoluble in water.
Therefore, statement (III) is incorrect.
Step 4: Check statement (IV).
In the crystal structure of ice, each oxygen atom forms hydrogen bonds with four neighboring oxygen atoms in a tetrahedral arrangement.
Hence, statement (IV) is correct.
Step 5: Identify the correct statements.
The correct statements are: \[ (I)\ \text{and}\ (IV) \]
Step 6: Final conclusion.
Therefore, the correct answer is \[ \boxed{\text{I \& IV only}} \]
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