Chemical Effect...

Which of the following statements about electroplating is incorrect?

Which of the following elements would get discharged more readily at the cathode during electrolysis?

Which of the following is not an inert electrode?

Electrical appliances can be run on a battery of dry cells, which provides the potential difference across its terminals.
Which aspect of electric current is being demonstrated by this application?

In an electric heater, current is allowed to flow through the coil. It turns red and is ready to use. Which of the following energy conversions takes place here?

Why is chromium used for electroplating?

(a) It does not corrode.
(b) It is scratch resistant.
(c) It is cheap, easily available and can be electroplated very easily.

A test lamp does not glow while testing the conductivity of a liquid. What does it imply?

We have distilled water in two plastic bottles labelled as A and B. We add hydrochloric acid to the water in bottle A and caustic soda to the water in bottle B. Which of the following will hold true?

According to Faraday's first law, the amount of substance deposited at electrode when electric current is passed through an electrolyte depends upon the

(a) amount of current passed
(b) dissociation of electrolyte
(c) time till which current is passed
(d) nature of electrode material

Electroplating is coating a metal with a layer of another metal. The purpose of the process is:

An electrochemical cell stops working after some time because

Why is it advised to wear rubber slippers while handling the electrical appliances?

When the current through a circuit is too weak, the bulb does not glow because the

What happens when electric current is passed through a silver nitrate solution?

What will be the observation when the following circuit is set up?

Which of the following statements is/are false?

a. A solution of hydrochloric acid or sulphuric acid in water conducts electricity.
b. Vinegar does not conduct electricity as it is a solution of a non- electrolyte
c. An arrangement having two electrodes kept in a conducting liquid in a vessel is called an electrolytic cell.

Which of the following solutions are non-electrolytes?

a. Glucose solution
b. Vinegar solution
c. Alcohol solution
d. Common salt solution

Which of the following statements is/are false?

a. Caustic soda is produced by the electrolysis of an aqueous solution of sodium chloride.
b. If we take distilled water in a beaker and pass electricity through it, then the bulb will not glow at all even if a large battery is applied.
c. A solution of sodium hydroxide or potassium hydroxide in water conducts electricity.

Which of the following gases is formed at the anode, connected to the positive terminal of the battery, when electric current is passed through acidified water?

When an electric current flows through a conducting solution, it causes a chemical change. The chemical reactions brought about by an electric current will not produce which of the following effects?

a. Change in the colour of the solution may occur.
b. Deposits of metal will be formed on the sides of the glass container.
c. Bubbles of a gas or gases may be formed on the electrodes.