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Chapter 10: Problem 99

An inorganic compound first melts, then resolidifies and then liberates a gas. It may be (1) \(\mathrm{KClO}_{3}\) (2) \(\mathrm{KMnO}_{4}\) (3) \(\mathrm{Al}_{2} \mathrm{O}_{3}\) (4) \(\mathrm{MnO}_{2}\)

Short Answer

Expert verified
Option 4: \( \mathrm{MnO}_{2} \)

Step by step solution

01

Understand The Properties

Analyze the given compounds and their properties, specifically their behavior under heating. Look for one that first melts, then resolidifies, and finally liberates gas.
02

Analyze \(\mathrm{KClO}_{3}\)

\( \mathrm{KClO}_{3} \) decomposes upon heating and gives off oxygen gas but does not meet the melting and resolidification criteria first.
03

Analyze \(\mathrm{KMnO}_{4}\)

\( \mathrm{KMnO}_{4} \) decomposes upon heating, liberating oxygen gas, but there is no specific indication of it melting and resolidifying first.
04

Analyze \(\mathrm{Al}_{2} \text{O}_{3}\)

\( \mathrm{Al}_{2} \text{O}_{3} \) is a very stable compound and does not decompose easily at normal laboratory conditions.
05

Analyze \(\mathrm{MnO}_{2}\)

\( \mathrm{MnO}_{2} \) upon heating, melts, then resolidifies and finally decomposes releasing oxygen gas.
06

Conclusion

After examining all options, \( \mathrm{MnO}_{2} \) is the compound that fits the given description of melting, resolidifying and liberating a gas.

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Key Concepts

These are the key concepts you need to understand to accurately answer the question.

Inorganic Chemistry
Inorganic chemistry is the branch of chemistry that deals with inorganic compounds, which typically lack carbon-hydrogen bonds found in organic compounds. This field often involves studying minerals, metals, salts, and other non-organic substances. The compounds mentioned in the exercise, including \(\text{KClO}_3\), \(\text{KMnO}_4\), \(\text{Al}_2\text{O}_3\), and \(\text{MnO}_2\), are all inorganic compounds. Each of these exhibits unique physical and chemical properties under different conditions.
Thermal Decomposition
Thermal decomposition, also known as thermolysis, is a chemical decomposition process caused by heat. During this process, a compound breaks down into simpler substances as its temperature increases. Let's consider MnO2, the main compound described in the exercise. \(\text{MnO}_2\) undergoes complex processes under heat:
Properties of Compounds
Every compound exhibits specific properties that determine how it behaves under certain conditions. These properties can include melting points, boiling points, stability, and reactivity. For instance, MnO2 melts when heated, resolidifies, and then decomposes to release a gas. This behavior is distinct and helps to identify it among other compounds like \(\text{KClO}_3\), \(\text{KMnO}_4\), or \(\text{Al}_2\text{O}_3\). Understanding these properties is essential for identifying and working with different compounds in inorganic chemistry.

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Most popular questions from this chapter

Which of the following statement is false? (1) Among alkali metals, lithium is the softest metal. (2) Ionisation potential of lithium will be greater than that of sodium. (3) In an aqueous solution, lithium is the strongest reducing agent. (4) Alkali metals show abrupt increase in second IP.

Identify the false statement about the extraction of alkali metals. (1) They cannot be extracted by thermal decomposition because their compounds are stable. (2) They cannot be extracted by chemical reduction because they themselves are strong reducing agents. (3) They cannot be extracted by clectrolysis of their aqueous solutions of salts becausc they arc morc clectropositive than the hydrogen (4) They cannot be extracted by clectrolysis of the fuscd salts becausc of thcir high melting points.

\(\mathrm{Na}_{2} \mathrm{CO}_{3}\) can be manufactured by Solvay process but \(\mathrm{K}_{2} \mathrm{CO}_{3}\) cannot be prepared because (1) \(\mathrm{K}_{2} \mathrm{CO}_{3}\) is more soluble (2) \(\mathrm{K}_{2} \mathrm{CO}_{3}\) is less soluble (3) \(\mathrm{KHCO}_{3}\) is more soluble than \(\mathrm{NaHCO}_{3}\) (4) \(\mathrm{KHCO}_{3}\) is less soluble than \(\mathrm{NaHCO}_{3}\)

Rcgarding \(\mathrm{KO}_{2}\) which of the following is correct? (1) It is a superoxide. (2) It is coloured. (3) It is paramagnetic. (4) All are correct.

Which of the following is correct regarding solutions of sodium metal in liquid ammonia? (1) The solutions are generally blue coloured, good conductors of electricity and conductivity decreases as temperature rises. (2) The solutions are paramagnetic but paramagnetic character decreases as concentration of solution is increased. (3) When \(\mathrm{NH}_{4} \mathrm{Cl}\) solid is added to such a solution, \(\mathrm{NaCl}\) is precipitated. (4) All the above are correct.
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