Which of the following is used to test the presence of starch?
Which one of the following solutions would you use to test the pH of a given sample? (1) blue litmus solution (2) red litmus solution (3) universal indicator solution (4) mixture of red and blue litmus solution
What would you observe when :
(a) blue litmus is introduced into a solution of hydrogen chloride gas,
(b) red litmus paper is introduced into a solution of ammonia in water,
(c) red litmus paper is introduced in caustic soda solution?
Four students A, B, C and D were studying the effect of the solutions of hydrochloric acid, sodium hydroxide, sodium chloride and pure water respectively on blue litmus solution. Which of the students observed the colour change of blue litmus solution to red? (1) A (2) B (3) C (4) D