Question 21 MarkAll substances are either acidic or basic.Answerfalse, substances can be neutral as well. View full question & answer→
Question 31 MarkPhenolphthalein is a natural Indicator.Answerfalse, phenolphthalein is a man-made indicator.View full question & answer→
Question 41 MarkCommon salt dissolved in water turns blue litmus to red litmus.Answerfalse, salt water solution is a neutral solution, hence, it cannot change the colour of litmus.View full question & answer→
Question 51 MarkLemon water is basic in nature.Answerfalse, lemon water is acidic in nature.View full question & answer→
Question 61 MarkTooth decay is caused by the presence of a base.Answerfalse, tooth decay is caused by the presence of acid.View full question & answer→
Question 71 MarkIndicator is a substance which shows different colours in acidic and basic solutions.AnswertrueView full question & answer→
Question 81 MarkSodium hydroxide and hydrochloric acid neutralises each other and form salt and water.AnswertrueView full question & answer→
Question 91 MarkSodium hydroxide turns blue litmus to red.Answerfalse, sodium hydroxide is a base, so it will turn red litmus to blue.View full question & answer→
Question 101 MarkNitric acid turns red litmus to blue.Answerfalse, nitric acid turns blue litmus to red because it is an acid. View full question & answer→
Question 111 MarkMagnesium hydroxide is called as milk of magnesia.AnswertrueView full question & answer→
Question 131 MarkChina rose indicator turns acidic solution to dark pink and basic solution to green.AnswertrueView full question & answer→