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Which of the following is/are pseudo sol...

Which of the following is/are pseudo solids?
(P) KCl
(Q) Barium chloride dihydrate
(C ) Coke left after distillation of coal tar:

A

I, III

B

II, III

C

III,IV

D

only III

Text Solution

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The correct Answer is:
To determine which of the given substances are pseudo solids, we need to understand the definition of pseudo solids and analyze each option accordingly. ### Step-by-Step Solution: 1. **Understanding Pseudo Solids**: - Pseudo solids, also known as super-cooled liquids, are materials that appear solid but can flow very slowly over time. Common examples include glass and rubber. 2. **Analyzing Option (P) KCl**: - KCl (Potassium Chloride) is an ionic solid that has a definite crystalline structure. It does not exhibit the properties of a pseudo solid as it does not flow, even very slowly. - **Conclusion**: KCl is **not** a pseudo solid. 3. **Analyzing Option (Q) Barium Chloride Dihydrate**: - Barium chloride dihydrate is a crystalline solid that also does not exhibit the characteristics of a pseudo solid. It retains a fixed shape and does not flow. - **Conclusion**: Barium chloride dihydrate is **not** a pseudo solid. 4. **Analyzing Option (C) Coke Left After Distillation of Coal Tar**: - Coke is a solid residue obtained from the distillation of coal tar, and it can exhibit flow characteristics over long periods (similar to coal tar pitch). This property qualifies it as a pseudo solid. - **Conclusion**: Coke left after distillation of coal tar **is** a pseudo solid. 5. **Final Answer**: - Among the options provided, only the third option (Coke left after distillation of coal tar) is classified as a pseudo solid. ### Summary: - The only pseudo solid from the options is **C** (Coke left after distillation of coal tar).
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Knowledge Check

  • Select correct answers from the choices A, B, C, D which are given. Write down only the letter corresponding to the correct answer. Which of the following salts will give a dirty green precipitate with sodium hydroxide and a white precipitate with barium chloride?

    A
    iron (III) sulphate
    B
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    C
    iron (II) sulphate
    D
    iron (II) chloride
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