Formula of Plaster of Paris is
Options
(a) CaSO₂.(1/2)H₂O (b) CaSO₄.H₂O (c) CaSO₄.(1/3)H₂O (d) CaSO₄.2H₂O
Correct Answer:
CaSO₂.(1/2)H₂O
Explanation:
Plaster of Paris is CaSO₄. 1/2 H₂O. It is formed by heating the gypsum. CaSO₄. […]
Dynamite contains
Options
(a) H₂SO₄ (b) saw dust (c) both of these (d) none of these
Correct Answer:
saw dust
Explanation:
Dynamite these days is prepared by absorbing the nitroglycerine in sawdust and […]
NaHCO₃ is prepared by
Options
(a) Dow process (b) Solvay process (c) Bosch process (d) none of these
Correct Answer:
Solvay process
Explanation:
No explanation available. Be the first to write the explanation […]
Which of the following is used as ”anasthesia”
Options
(a) N₂O (b) CH₄ (c) N₂ (d) CO₂
Correct Answer:
N₂O
Explanation:
No explanation available. Be the first to write the explanation for this […]
CCl₄ is used as a fire extinguisher, because
Options
(a) its boiling point is low (b) its melting point is high (c) it gives incombustible vapour (d) it forms covalent bond
Correct Answer: […]
Tetraethyl lead is used as
Options
(a) anti-knock agent (b) pain killer (c) mosquito repellent (d) fire extinguisher
Correct Answer:
anti-knock agent
Explanation:
No explanation available. Be the first to write the explanation […]
Which of the following is used as refrigerant
Options
(a) SiC (b) CO₂ (c) CF₂Cl₂ (d) CHCl₃
Correct Answer:
CF₂Cl₂
Explanation:
No explanation available. Be the first to write the explanation for this […]
Which of the following is endothermic reaction
Options
(a) 3H₂+ N₂ → 2NH₃ (b) C + O₂ → CO₂ (c) PCl₃ + Cl₂ → PCl₅ (d) N + (1/2)O₂ → NO
Correct Answer: […]
Colloidal found effective in medicines is
Options
(a) colloidal gold (b) colloidal sulphur (c) colloidal antimony (d) all of these
Correct Answer:
all of these
Explanation:
No explanation available. Be the first to […]
How many coulombs are required for the oxidation of 1 mole H₂O to O₂
Options
(a) 3.86 x 10⁵ C (b) 1.93 x 10⁵ C (c) 4.825 x 10⁴ C (d) 9.65 x […]
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