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Test: Important Compounds of s-Block (Old NCERT) - JEE MCQ


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10 Questions MCQ Test - Test: Important Compounds of s-Block (Old NCERT)

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Test: Important Compounds of s-Block (Old NCERT) - Question 1
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In Castner Kellner cell:

Detailed Solution for Test: Important Compounds of s-Block (Old NCERT) - Question 1
  • Castner Kellner cell is also called a mercury cathode cell.
  • In this cell, Hg flows along the bottom of the cell and acts as a cathode in the left-hand compartment fitted with graphite anodes in brine (NaCl) solution, whereas the right-hand compartment is fitted with Fe cathodes dipped in very dilute NaOH solution and Hg acts as the anode in this compartment.
  • Thus, Hg acts as an intermediate electrode by induction, cathode on LHS and anode in RHS.

 

Test: Important Compounds of s-Block (Old NCERT) - Question 2
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Heating limestone at a temperature of 1070 K we get:

Detailed Solution for Test: Important Compounds of s-Block (Old NCERT) - Question 2

Heating limestone at a temperature of 1070K we get quick lime i.e CaO.

CaCO3 ⇌ CaO (s) + CO2 (s)

Additional Information: Calcium oxide can be produced by the thermal decomposition of materials like limestone or seashells that contain calcium carbonate in a lime kiln.

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Test: Important Compounds of s-Block (Old NCERT) - Question 3
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Aqueous solution of which of the following compounds is used to detect carbon dioxide:​

Detailed Solution for Test: Important Compounds of s-Block (Old NCERT) - Question 3

On passing CO2 gas, Ca(OH)2 becomes CaCO3 (milky white ppt.) which proves the presence of CO2.

Test: Important Compounds of s-Block (Old NCERT) - Question 4
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Passing carbon dioxide through slaked lime gives:​
Detailed Solution for Test: Important Compounds of s-Block (Old NCERT) - Question 4

If CO2 is passed through slaked lime(calcium hydroxide Ca(OH)2), it gives out calcium carbonate (CaCO3) also called marble/limestone.

CO2 + Ca(OH)2→ CaCO3+ H2O

Test: Important Compounds of s-Block (Old NCERT) - Question 5
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Bones and teeth contains:
Detailed Solution for Test: Important Compounds of s-Block (Old NCERT) - Question 5
  • Teeth are composed of calcium, phosphorus, and other minerals. 
  • Bones contain calcium, phosphorus, sodium and other minerals, but mostly consist of the protein collagen.

Additional Information: The hardest part of the human body, teeth mostly consist of a calcified tissue called dentin. The tooth's dentine tissue is covered in enamel, that hard, shiny layer that you brush.

Test: Important Compounds of s-Block (Old NCERT) - Question 6
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In Castner Kellner cell, electrolyte used is:
Detailed Solution for Test: Important Compounds of s-Block (Old NCERT) - Question 6

In the Castner-Kellner method NaOH is prepared by the electrolysis of an aqueous solution of NaCl(Brine).

Additional Information: The Castner Kellner process is a method of electrolysis of sodium chloride solution to produce alkali hydroxide. It uses electrolytes of NaCl solution graphite anode and mercury cathode.

Test: Important Compounds of s-Block (Old NCERT) - Question 7
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Milk of lime reacts with chlorine to produce:
Detailed Solution for Test: Important Compounds of s-Block (Old NCERT) - Question 7

Slaked lime (milk of lime) reacts with chlorine gas to produce the bleaching agent calcium hypochlorite – a common form of 'swimming pool' chlorine.

Test: Important Compounds of s-Block (Old NCERT) - Question 8
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What is washing soda?
Detailed Solution for Test: Important Compounds of s-Block (Old NCERT) - Question 8
  • Sodium carbonate, Na2CO3, (washing soda) is the water-soluble sodium salt of carbonic acid, well-known domestically for its everyday use as a water softener.
  • Pure sodium carbonate is a white, odorless powder that is hygroscopic (absorbs moisture from the air).
  • It has a strongly alkaline taste and forms a moderately basic solution in water.
Test: Important Compounds of s-Block (Old NCERT) - Question 9
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Pure NaCl is obtained by the process of:
Detailed Solution for Test: Important Compounds of s-Block (Old NCERT) - Question 9

Crystallization: A chemical solid-liquid separation technique in which mass transfer of a solute from the liquid solution to a pure solid crystalline phase occurs.

Additional Information:

  • Crude sodium chloride, generally obtained by the crystallization of brine solution, contains sodium sulphate, calcium sulphate, calcium chloride and magnesium chloride as impurities.
  • To get pure sodium chloride first the crude sodium chloride is dissolved in a minimum amount of water and filtered to remove insoluble impurities.
  • Now into the saturated solution of sodium chloride hydrogen chloride gas is passed.
  • Then pure sodium chloride crystallizes.
  • The other compounds which are present in small amounts such as MgCl2MgCl2 and CaCl2CaCl2 remain in solution.
Test: Important Compounds of s-Block (Old NCERT) - Question 10
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The formula of bleaching powder is:​
Detailed Solution for Test: Important Compounds of s-Block (Old NCERT) - Question 10

The chemical name of bleaching powder is calcium hypochlorite.it is manufactured by the action of chlorine on slaked lime (Ca(OH).
2Ca(OH)2+ 2Cl2→CaOCl2+ 2H2O+CaCl2

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