Science
The solution in the given figure is likely to be
options
- HNO3
- C2H5OH
- H2SO4
- CO2 in water
Answer
C2H5OH
Reason — The circuit is a simple conductivity tester in which the bulb glows only if the solution contains enough ions to conduct current.
- HNO3 and H2SO4 are strong acids; they dissociate completely in water to give many ions, so the bulb would glow brightly.
- CO2 in water produces weak carbonic acid (H2CO3), a weak electrolyte that may give at most a very faint glow.
- Ethanol (C2H5OH), however, is a covalent, non-electrolyte in water— it does not ionize, so the solution does not conduct and the bulb does not glow.
Hence, the solution is ethanol (C2H5OH).
Related Questions
Match column I with column II and select the correct option using the given codes.
Column I Column II a. A metal that forms amphoteric oxides (i) Ga b. A metal which melts when kept on our palm (ii) Au c. A metal that reacts with nitric acid (iii) Al d. A metal which cannot displace hydrogen from acids (iv) Mn options
- a – (ii), b – (i), c – (iii), d – (iv)
- a – (iii), b – (i), c – (iv), d – (ii)
- a – (iv), b – (ii), c – (iii), d – (i)
- a – (iii), b – (ii), c – (i), d – (iv)
Which among the following is considered as the strongest electrolyte?
options
- Dilute acid
- Dilute sugar solution
- Glucose solution
- Ethanol in water
An aqueous solution ‘A’ turns the phenolphthalein solution pink. On addition of an aqueous solution ‘B’ to ‘A’, the pink colour disappears. Which of the following statement is true for the solutions ‘A’ and ‘B’.
options
- A is strongly basic and B is a weak base.
- A is strongly acidic and B is a weak acid.
- A has a pH greater than 7 and B has a pH less than 7.
- A has a pH less than 7 and B has a pH greater than 7.