Archives

In the following schematic diagram for the preparation of hydrogen gas, as shown in Figure, what would happen if the following changes are made? (a) In place of zinc granules, the same amount of zinc dust is taken in the test tube (b) Instead of dilute sulphuric acid, dilute hydrochloric acid is taken (c) In place of zinc, copper turnings are taken (d) Sodium hydroxide is taken in place of dilute sulphuric acid, and the tube is heated.

Answer: (a) In place of zinc granules, the same amount of zinc dust is taken in the test tube If the same amount of zinc dust is used in the... View Article

Which of the following is(are) true when HCl (g) is passed through water? (i) It does not ionise in the solution as it is a covalent compound. (ii) It ionises in the solution (iii) It gives both hydrogen and hydroxyl ion in the solution (iv) It forms hydronium ion in the solution due to the combination of hydrogen ion with water molecule (a) (i) only (b) (iii) only (c) (ii) and (iv) (d) (iii) and (iv)

Answer: (c) (ii) and (iv) Acid produces hydrogen which will combine with a water molecule to produce Hydronium ions. HCl is a strong acid that... View Article

In an attempt to demonstrate electrical conductivity through an electrolyte, the following apparatus was set up. Which among the following statement(s) is(are) correct? 1) Bulb will not glow because the electrolyte is not acidic 2) Bulb will glow because NaOH is a strong base and furnishes ions for conduction. 3) Bulb will not glow because the circuit is incomplete 4) Bulb will not glow because it depends upon the type of electrolytic solution (a) (i) and (iii) (b) (ii) and (iv) (c) (ii) only (d) (iv) only

Answer: (c) (ii) only A channel through which electrons travel from a voltage or current source is known as an electric circuit. Electric... View Article