The correct option is (b) Zinc. When dilute sulphuric acid reacts with zinc, it releases hydrogen gas. This colourless gas burns with a pop sound when a burning matchstick is brought near, confirming the presence of hydrogen. Class 10 Science Sample ...
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The correct option is (d) NaHCO₃. Sodium bicarbonate is a mild, non-corrosive base commonly used in baking soda. It is safe, weakly alkaline, and does not harm or corrode, unlike strong bases such as sodium hydroxide or calcium hydroxide. Class 10 ...
The correct option is (b) Colourless. When zinc metal is placed in copper sulphate solution, zinc displaces copper because it is more reactive. The blue colour of copper sulphate fades, turning the solution nearly colourless as zinc sulphate forms. Class 10 ...
(A) Electrolytic decomposition of water/electrolysis of water. (B) The gas collected at cathode is hydrogen which is double the volume of oxygen collected at anode. sample paper for class 10 science board exam 2026 CBSE Sample Paper Class 10 Science 2025-26
Lime water turns milky because carbon dioxide gas reacts with calcium hydroxide solution to form calcium carbonate. When ethanoic acid reacts with sodium hydrogen carbonate, the products formed are sodium ethanoate (X), water, and carbon dioxide gas (Y). cbse class 10 ...