S and P Block Elements Archives

Which of the following compounds is efflorescent? Options (a) Na₂CO₃ 10H₂O (b) Na₂CO₃ (c) Na₂CO₃ H₂O (d) NaHCO₃ Correct Answer:…

7 years ago

The gas which combin with haemoglobin to damage its oxygen carrying capacity is Options (a) co (b) CO₂ (c) N₂…

7 years ago

Among the following the least thermally stable is Options (a) K₂CO₃ (b) Na₂CO₃ (c) BaCO₃ (d) Li₂CO₃ Correct Answer: Li₂CO₃Explanation:No…

7 years ago

Borax is used as a cleansing agent because on dissolving in water it gives Options (a) alkaline solution (b) acidic…

7 years ago

Sodium Hydroxide reacts with Zinc to form Options (a) ZnO (b) Na₂ZnO₂ (c) ZnH₂ (d) Zn(OH)₂ Correct Answer: Na₂ZnO₂Explanation:No explanation…

7 years ago

The number of water molecules in gypsum and in plaster of paris are respectively Options (a) 2 and 1/2 (b)…

7 years ago

Which one of the following metals forms superoxide? Options (a) Ca (b) Zn (c) Ti (d) K Correct Answer: KExplanation:No…

7 years ago

Portland cement contains the following amount of CaO Options (a) 5-15% (b) 20-35% (c) 50-60% (d) 70-80% Correct Answer: 50-60%Explanation:No…

7 years ago

If Na is heated in presence of air, it forms Options (a) Na₂CO (b) Na₂O₂ (c) Na₂O (d) both Na₂O₂…

7 years ago

On heating sodium metal in dry ammonia, the compound formed is Options (a) sodium hydride (b) sodium azide (c) sodium…

7 years ago