Why is the amount of gas collected in one of the test tubes in Activity 1.7 double of the amount collected in the other? Name this gas.
A solution of a substance ‘X’ is used for whitewashing.
(i) Name the substance ‘X’ and write its formula.
(ii) Write the reaction of the substance ‘X’ named in (i) above with water.
Write a balanced chemical equation with state symbols for the following reactions.
(i) Solutions of barium chloride and sodium sulphate in water react to give insoluble barium sulphate and the solution of sodium chloride.
(ii) Sodium hydroxide solution (in water) reacts with hydrochloric acid solution (in water) to produce sodium chloride solution and water.
Write the balanced equation for the following chemical reactions.
(i) Hydrogen + Chlorine → Hydrogen chloride
(ii) Barium chloride + Aluminium sulphate → Barium sulphate + Aluminium chloride
(iii) Sodium + Water → Sodium hydroxide + Hydrogen
Given a data set with values 12, 15, 20, 20, 25, 30, and 35, calculate the mean, median, and mode of this data set.
Find the real and imaginary parts of the complex number 4 minus 3i divided by 2 plus i.
Prove by mathematical induction that the sum of the first n natural numbers is equal to n times (n plus 1) divided by 2.
Prove that tan theta plus cot theta is equal to sec theta times cosec theta.
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