Batteries

48問 • 1年前

Nayan Kumar

通報

問題一覧

Those galvenic cell which cannot be recharge again and again are known as

primary cell

Those galvanic cell which can be recharged again and again

secondary cell

Emf of dry cell

1.5V

Dry cell are also known as leclanche cell

Which substance act as cathode in dry cell

Which substance act as anode in dry cell

Which substance act as electrolyte in dry cell

Manganese gets reduced to form which compound in dry cell reaction

Manganese gets reduced in dry cell reaction to

+4 to +3

Manganese gets reduced in dry cell reaction

Net reaction of a dry cell is irreversible so it can be recharge

Zinc gets oxidized in dry cell reaction

Which complex is formed by Zn²+ with ammonia (NH3)

Pb acts as cathode in lead storage battery

Grid of lead packed with PbO2 act as cathode in lead storage battery

Which substance act as electrolyte in lead storage battery

In lead storage battery density of solution gets decreases during discharging

In lead storage battery recharging is done by applying EMF in opposite direction to reverse the direction

Those device which convert energy release during combustion of a substance into electrical energy are known as

fuel cell

Which fuel cell was used in Apollo space program

Fuel cell can give constant emf because Qc can be kept constant by supplying gas at constant pressure

During discharging reaction of lead storage battery lead sulphate (PbSO4) gets dissociated

During discharging reaction of lead storage battery PbO2 converts to Pb²+

During discharging reaction of lead storage battery Pb converts to Pb²+

Dry cell is commonly used in our transistor and clocks

Mercury cells suitable for low current devices like hearing AIDS watches etc

Which substance act as anode in Mercury cell

Which substance act as cathode in Mercury cell

Which substance act as electrolyte in Mercury cell

EMI produced by Mercury cell

1.35V

A: cell potential of Mercury cell remains constant during its life R: overall cell reaction does not involve any ion

Spongy lead acts as anode in lead storage battery

When the lead storage cell discharges it act as voltaic cell

Nickel cadmium cell is expensive than lead storage battery

Anode in nickel cadmium cell

cadmium

Nickel cadmium cell has more life than lead storage battery

Cathode in nickel cadmium cell

metal grid containing NiO2

Electrolyte in nickel cadmium cell

KOH solution

Fuel cells are pollution free and have high efficiency

Efficiency of fuel cell

70%

Efficiency of thermal power plant

40%

Electrolyte used in hydrogen oxygen fuel cell

NaOH

Catalysts like finely divided platinum or palladium metal are incorporated into the electrodes for increasing the rate of electrode reactions

The water vapours produced during the reaction were condensed and added to the drinking water supply for the astronauts.

Incorrect statement about dry cell is

Zn container act as cathode

Incorrect statement about Mercury cell

paste of KOH and ZnO act as anode

A: energy conversion from chemical energy to electrical energy is more efficient by galvanic cell in compared to thermal power plants R: galvanic cell directly convert chemical energy into electrical energy