Question:
Identify a pair of isomorphous substances from following.
Identify a pair of isomorphous substances from following.
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Isomorphous substances have the same crystal structure and similar atomic ratio, as in NaF and MgO.
Updated On: Nov 12, 2026
- Diamond and Fullerene
- \(\beta\) - Quartz and Cristobalite
- Sodium fluoride and Magnesium oxide
- Calcite and Aragonite
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The Correct Option is C
Solution and Explanation
Step 1: Understanding the Concept
Isomorphous substances are different compounds that crystallise in the same structure and have a similar formula type.
Step 2: Check the pairs
Diamond and fullerene are allotropes of carbon. \(\beta\)-quartz and cristobalite are forms of silica. Calcite and aragonite are polymorphs of \(\text{CaCO}_3\). These are the same substance in different forms, not isomorphs.
Step 3: Sodium fluoride and magnesium oxide
\(\text{NaF}\) and \(\text{MgO}\) both have a 1:1 ratio and crystallise in the rock-salt (face-centred cubic) structure.
Step 4: Compare the options
So the isomorphous pair is option (C).
Final Answer:
Sodium fluoride and magnesium oxide are isomorphous. \[ \boxed{\text{(C) }\text{Sodium fluoride and Magnesium oxide}} \]
Isomorphous substances are different compounds that crystallise in the same structure and have a similar formula type.
Step 2: Check the pairs
Diamond and fullerene are allotropes of carbon. \(\beta\)-quartz and cristobalite are forms of silica. Calcite and aragonite are polymorphs of \(\text{CaCO}_3\). These are the same substance in different forms, not isomorphs.
Step 3: Sodium fluoride and magnesium oxide
\(\text{NaF}\) and \(\text{MgO}\) both have a 1:1 ratio and crystallise in the rock-salt (face-centred cubic) structure.
Step 4: Compare the options
So the isomorphous pair is option (C).
Final Answer:
Sodium fluoride and magnesium oxide are isomorphous. \[ \boxed{\text{(C) }\text{Sodium fluoride and Magnesium oxide}} \]
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