class8

when electric current is passed through a conducting solution, there is a change of colour in the solution.this indicates?

• the ionic effect of current

• the heating effect of current

• the chemical effect of current

• the magnetic effect of current

which of the following solutions will poorly conduct electricity

• bases

• acids

• oils

• salts

one kilogram of hydrogen when combined with oxygen will make____of water

In an electric circuit, if the current flowing through a conductor is doubled, how does the heat produced per unit time change?

• It remains the same

• It doubles

• It increases four times

• It decreases to half

During electrolysis, the mass of a substance deposited at an electrode is directly proportional to which of the following?

• Voltage applied across the electrolyte

• Current and time of passage of current

• Resistance of the electrolyte

• Square of the current

Which of the following is NOT a factor affecting the electrolysis process?

• Nature of electrolyte

• Temperature of the solution

• Atomic number of the electrode

• Nature of electrodes

The process used to refine impure metals using electrolysis is called:

What will happen if copper electrodes are used in the electrolysis of CuSO₄ solution instead of inert electrodes?

• The concentration of Cu²⁺ ions in the solution remains constant

• The Cu²⁺ ion concentration decreases over time

• The anode dissolves but no Cu²⁺ ions are released

• The cathode gets corroded

In the electrolysis of water, the ratio of volume of hydrogen to oxygen gas collected is:

which of the following anions have a chance of getting electrolysed by the anode.

• Cl-

• SO4-

• I-

• br_