CaCl2 is used as from Chemistry The s-Block Elements

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 Multiple Choice QuestionsMultiple Choice Questions

51.

In the lime kiln, the reaction CaCO3(s) → CaO(s) + CO2 (g) goes to completion because:

  • of high temperature

  • CaO is more stable than CaCO3

  • CO2 escapes simultaneously

  • CO2 is a gaseous product


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52.

CaCl2 is used as

  • disinfectant

  • desiccating agent

  • medicine

  • None of these


B.

desiccating agent

CaCl2 is used as desiccating agent. It is used in desiccator to remove moisture from it.


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53.

Dry distillation of calcium acetate and calcium formate forms:

  • methanol

  • ethanal

  • ethanol

  • acetone


54.

With cold and dilute sodium hydroxide fluorine reacts to give

  • NaF and OF2

  • NaF + O3

  • O2 and O3

  • NaF + O2


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55.

Which one of the following reactions occur at the anode, in the Castner process of extracting sodium metal ?

  • H2 → 2H+ + 2e-

  • 2Cl- → Cl2 + 2e-

  • 4OH- → 2H2O + O2 + 4e-

  • Na+ + e- → Na


56.

A mixture of sodium oxide and calcium oxide are dissolved in water, and saturated with excess carbon dioxide gas. The resulting solution...... is It contains ....... :

  • basic; NaOH and Ca(OH)2

  • neutral; Na2CO3 and CaCO3

  • Basic; Na2CO3 and CaCO3

  • Acidic; NaOH and Ca(OH)2


57.

The compound formed when gypsum is dissolved in aqueous ammonium sulphate solution, is

  • CaSO4.NH4Cl, H2O

  • CaCl2.(NH4)2SO4 , H2O

  • CaSO4.(NH4)2SO4 2H2O

  • CaCl2, NH4Cl.2H2O


58.

What are the products formed when an aqueous solution of magnesium bicarbonate is boiled?

  • MgO, H2O, CO2

  • Mg(HCO3)2, H2O

  • Mg(OH)2, H2O

  • Mg, CO2, H2O


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59.

Oxalic acid reacts with concentrated H2SO4 to give a mixture of two gases. When this mixture is passed through caustic potash, one of the gase is absorbed. What is the product formed by the absorbed gas with caustic potash?

  • K2SO4

  • K2HCO4

  • K2CO3

  • KOH


60.

Exhausted permutit does not contain ...... ion

  • Na+

  • Mg2+

  • Al3+

  • Si4+


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