Main constituent of limestone is (A) CaCO3 (B) MgCO3 (C) Na2CO3 (D) CaSO4

Main constituent of limestone is
(A) CaCO3
(B) MgCO3
(C) Na2CO3
(D) CaSO4
by

1 Answer

Answer :

(A) CaCO3
by

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Last Answer : (B) MgCO3

Eschka mixture, which is used for the determination of sulphur in coal, is a mixture of (A) MgO & Na2CO3 (B) MgSO4 & BaCl2 (C) BaSO4 & NaCl (D) MgCO3 & NaC

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Last Answer : (A) MgO & Na2CO3

Stalactites and Stalagmites form due to the precipitation of : (1) CaCO3 (2) CaCl2 (3) MgCl2 (4) MgCO3

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Last Answer : (1) CaCO3 Explanation: Stalactites and stalagmites are formed by water dripping or flowing from fractures on the ceiling of a cave. The dominant mineral in them is calcite (calcium carbonate) ... minerals that may be deposited include other carbonates, opal, chalcedony, limonite, and some sulfides.

Stalactites and Stalagmites form due to the precipitation of : (1) CaCO3 (2) CaCl2 (3) MgCl2 (4) MgCO3

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Last Answer : CaCO3

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Last Answer : (B) CO2 escapes continuously

In case of calcination of limestone, CaCO3 CaO + CO2 , the addition of more of CaO will result in __________ in the concentration of CO2 . (A) No change (B) Increase (C) Decrease (D) Unpredictable from the data

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Last Answer : (A) No change

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Last Answer : (B) CaC2 + H2O = Ca(OH)2 + C2H2

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Last Answer : (B) Direct use of liquid ammonia as a fertiliser for a tropical country like India is suitable

In the manufacture of ortho-phosphoric acid by strong H2SO4 leaching wet process, keeping the reactor temperature above 100°C, results in the formation of undesirable (A) CaSO4 .½ H2O and CaSO4 crystals (B) Pyrophosphoric acid (C) Meta-phosphoric acid (D) All (A), (B) and (C)

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Last Answer : (A) CaSO4 .½ H2O and CaSO4 crystals

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Last Answer : (A) Na2SO4

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Mgco3 + hcl = What will happen ?

Description : Mgco3 + hcl = What will happen ?

Last Answer : MgCO₃ + HCl → MgCl₂ + CO₂ + H₂O

What does a reaction between MgCO3 and NH4Br form?

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Last Answer : Magnesium carbonate is not soluble in water.

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Last Answer : (B) CO2 , H2 and N2

Considering the endothermic dissociation of CaCO3 in a closed vessel (CaCO3 ⇌ CaO + CO2 ), the pressure of CO2 increases, if (A) A catalyst is added (B) The temperature is increased (C) An inert gas is pumped keeping the temperature constant (D) None of these

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The slag which floats on the surface of the molten iron generally contains (A) Lime (CaO) 45% (B) Silica (SiO2) 35% (C) Alumina (Al2O3) 12% and MgO, CaSO4, KMnO2 and FeO 8% (D) All the above

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Last Answer : Answer: Option D

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Last Answer : (A) Permit the use of alum as a coagulant

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