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Sodium hydroxide is termed an alkali while Ferric hydroxide is not because:
ANSWER: [B] Explanation: An alkali is a base that dissolves in water hence, all alkalies are bases but all bases are not alkalies. Sodium hydroxide is termed as alkali as it is a strong base as well as highly soluble in water. Ferric hydroxide is also a base, but it is not an alkali as it is not solRead more
ANSWER: [B]
Explanation: An alkali is a base that dissolves in water hence, all alkalies are bases but all bases are not alkalies. Sodium hydroxide is termed as alkali as it is a strong base as well as highly soluble in water. Ferric hydroxide is also a base, but it is not an alkali as it is not soluble in water.
See lessThe name of the salt used to remove permanent hardness of water is:
ANSWER: [C] Explanation: Sodium carbonate decahydrate (Washing soda: ) is used to remove the permanent hardness of water. Sodium carbonate decahydrate, also called washing soda, is used to remove permanent hardness of water.
ANSWER: [C]
Explanation: Sodium carbonate decahydrate (Washing soda: ) is used to remove the permanent hardness of water. Sodium carbonate decahydrate, also called washing soda, is used to remove permanent hardness of water.
See lessAssertion (A): Baking soda is used in soda-acid fire extinguisher. Reason (R): On heating, it releases carbon dioxide which helps extinguish fire.
Explanation: Both the Assertion (A) and Reason (R) are true, but the Reason does not correctly explain the Assertion. Baking soda is used in soda-acid fire extinguishers because it reacts with sulphuric acid (H₂SO₄) to release carbon dioxide (CO₂) gas. The released CO₂ helps extinguish fire by displRead more
Explanation: Both the Assertion (A) and Reason (R) are true, but the Reason does not correctly explain the Assertion. Baking soda is used in soda-acid fire extinguishers because it reacts with sulphuric acid (H₂SO₄) to release carbon dioxide (CO₂) gas. The released CO₂ helps extinguish fire by displacing oxygen around it, which is essential for combustion, thereby effectively putting out the fire. Correct option is (B).
See lessA student performs the following experiment in his school laboratory. List two observations to justify that in this experiment a chemical change has taken place.
ANSWER: Observations to justify chemical change: Effervescence (bubbling) is observed due to the evolution of hydrogen gas when zinc reacts with dilute sulphuric acid. Zinc granules gradually dissolve and a new substance, zinc sulphate solution, is formed. Hence, gas evolution and formation of a newRead more
ANSWER: Observations to justify chemical change:
Hence, gas evolution and formation of a new product confirm that a chemical change has taken place.
See lessA carbon compound X is a good solvent. On reaction with sodium, X forms two products Y and Z. Z is used to convert vegetable oil into vegetable ghee. Identify and name X, Y and Z. Also write the equation of reaction of X with sodium to justify your answer.
The compound X is ethanol, which is a good solvent. When ethanol reacts with sodium, it forms two products: Y, which is sodium ethoxide, and Z, which is hydrogen gas. The hydrogen gas produced is used in the hydrogenation of vegetable oils to convert them into vegetable ghee. The reaction can be repRead more
The compound X is ethanol, which is a good solvent. When ethanol reacts with sodium, it forms two products: Y, which is sodium ethoxide, and Z, which is hydrogen gas. The hydrogen gas produced is used in the hydrogenation of vegetable oils to convert them into vegetable ghee. The reaction can be represented as ethanol reacting with sodium to produce sodium ethoxide and hydrogen gas, showing the displacement of hydrogen from ethanol by the metal sodium.
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