Which of the following compounds is efflorescent?
Options
(a) Na₂CO₃ 10H₂O (b) Na₂CO₃ (c) Na₂CO₃ H₂O (d) NaHCO₃
Correct Answer:
Na₂CO₃ 10H₂O
Explanation:
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The gas which combin with haemoglobin to damage its oxygen carrying capacity is
Options
(a) co (b) CO₂ (c) N₂ (d) O₂
Correct Answer:
co
Explanation:
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Among the following the least thermally stable is
Options
(a) K₂CO₃ (b) Na₂CO₃ (c) BaCO₃ (d) Li₂CO₃
Correct Answer:
Li₂CO₃
Explanation:
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Borax is used as a cleansing agent because on dissolving in water it gives
Options
(a) alkaline solution (b) acidic solution (c) bleaching solution (d) basic solution
Correct Answer:
alkaline solution
Explanation:
No […]
Sodium Hydroxide reacts with Zinc to form
Options
(a) ZnO (b) Na₂ZnO₂ (c) ZnH₂ (d) Zn(OH)₂
Correct Answer:
Na₂ZnO₂
Explanation:
No explanation available. Be the first to write the explanation for this question […]
The number of water molecules in gypsum and in plaster of paris are respectively
Options
(a) 2 and 1/2 (b) 5 and 2 (c) 2 and 1 (d) 7 and 2
Correct Answer: […]
Which one of the following metals forms superoxide?
Options
(a) Ca (b) Zn (c) Ti (d) K
Correct Answer:
K
Explanation:
No explanation available. Be the first to write the explanation for this […]
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:
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If Na is heated in presence of air, it forms
Options
(a) Na₂CO (b) Na₂O₂ (c) Na₂O (d) both Na₂O₂ and Na₂O
Correct Answer:
both Na₂O₂ and Na₂O
Explanation:
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On heating sodium metal in dry ammonia, the compound formed is
Options
(a) sodium hydride (b) sodium azide (c) sodium nitride (d) sodium amide
Correct Answer:
sodium amide
Explanation:
No explanation available. Be […]
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