Important Compounds of SodiumGeneral Science State Level

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Question1) Which of the following compound is formed when caustic soda is reacted with ferric chloride?

a) potassium chloride

b) sodium chloride only

c) ferric hydroxide only

d) both ferric hydroxide and sodium chloride✔✔

Option- ['True', 'False']

Answer: True

Explaination: Answer: d

Explanation: When 1 mole of ferric chloride is reacted with 3 moles of caustic soda, 1 mole of ferric hydroxide which is insoluble and three moles of sodium chloride are formed. It is an example of how caustic soda reacts with salt.

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Question2) Caustic soda and quicklime are together known as ___________

a) washing soda

b) caustic soda

c) soda lime✔✔

d) quicklime

Option- ['True', 'False']

Answer: True

Explaination: Answer: c

Explanation: A mixture of caustic soda and quicklime is known as soda lime, where caustic soda as nothing but sodium hydroxide and quicklime is calcium oxide. They are represented by the chemical formula NaOH and CaO respectively.

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Question3) Which of the following is a correct formula for washing soda?

a) Na2CO3.10H2O✔✔

b) Na2CO3

c) NaCO3

d) Na2CO

Option- ['True', 'False']

Answer: True

Explaination: Answer: a

Explanation: Washing soda is nothing but sodium carbonate it contains two atoms of sodium, one atom of carbon, three atoms of Oxygen and 10 moles of water in one molecule its chemical formula is given by Na2CO3.10H2O.

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Question4) Which of the following as a Process to prepare washing soda?

a) Solvay process✔✔

b) Amalgam process

c) Boiling

d) Clark’s process

Option- ['True', 'False']

Answer: True

Explaination: Answer: a

Explanation: In Solvay process, carbon dioxide gas is passed through brine solution saturated with Ammonia, which results in the formation of sodium bicarbonate, which is filtered and dried it is ignited to give sodium carbonate.

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Question5) Soda Ash is a ___________ salt.

a) moist

b) anhydrous✔✔

c) electrolysis

d) wet

Option- ['True', 'False']

Answer: True

Explaination: Answer: b

Explanation: Sodium carbonate crystallizes from water as decahydrate which effloresces. It on exposure to dry air forms monohydrate which on heating changes to the anhydrous side that is Soda Ash. Therefore, it is an anhydrous salt.

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