a) The given reaction is called a thermite reaction because it involves the displacement of a metal from its oxide by aluminium, producing a large amount of heat. b) In this reaction, aluminium (Al) is oxidised to aluminium oxide (Al₂O₃), ...
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The correct option is (D). High blood glucose levels are due to inadequate secretion of insulin from the pancreas. Insulin regulates blood sugar levels; its deficiency leads to diabetes mellitus, causing excess sugar in blood and urine. Science important questions Final ...
When dilute HCl reacts with zinc granules, bubbles of hydrogen gas are released, showing effervescence. Also, zinc chloride solution forms. These two observable changes confirm that a new substance is formed, proving chemical change. class 10 science half yearly 2025 cbse class ...
The correct option is (d) 11 (2,8,1). An element with atomic number 11 is sodium. It belongs to Group 1 and forms a basic oxide, sodium oxide (Na₂O), which reacts with water to form strong alkali sodium hydroxide. Science important questions ...