A student takes three beakers A, B, and C filled with aqueous solution of glucose, alcohol and hydrochloric acid respectively as shown in the following figure :
Battery Lulb switch Battery Bulb switch Battery Bulb switch
(A) (B) (C)
(i) State your observation in terms o glowing of bulb when the switch is on
(ii) Justify your observations by giving reason in each case.
(iii) Mention the change noticed with appropriate reason if the content of beaker B is replaced by sodium hydroxide solution.
CBSE Class X Science SA 2 (3 Marks)
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(i) Bulb A and B do not glow but Bulb C glows.
(ii) Glucose and alcohol solutions do not conduct electricity as they do not have ions and electric current is carried through the solution by flow of ions. Dil. HCl contains ions so the flow of ions is responsible for the flow of current. (iii) After replacement, bulb glows in B as NaOH solution contains ions (Na+ and OH– ions)
(ii) Glucose and alcohol solutions do not conduct electricity as they do not have ions and electric current is carried through the solution by flow of ions. Dil. HCl contains ions so the flow of ions is responsible for the flow of current. (iii) After replacement, bulb glows in B as NaOH solution contains ions (Na+ and OH– ions)
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