$A$ device that converts the energy of combustion of fuels like hydrogen and methane directly into electrical energy is known as:

In a dry cell,the reaction which takes place at the zinc anode is:

Which of the following statements is true for an electrolytic cell?

Which of the following statements is incorrect during the discharge of a lead storage battery?

Efficiency of a cell with cell reaction under standard conditions,$A_{(s)} + B^{+} \to A^{+} + B_{(s)}$; $\Delta H^o = -300 \ kJ$ is $70\%$. The standard electrode potential of the cell is :- .................... $V$

Colourless solutions of the following four salts are placed separately in four different test tubes and a strip of copper is dipped in each one of these. Which solution will turn Blue?