7th Standard Science Chapter 5 November 23, 2020December 19, 2020wefru 7th STD science Chapter 5 Quiz. it contains only 10 questions there no time limit. 0 Created on November 23, 2020 By wefru 7th Standard Science Chapter 5 TEST YOUR SKILLS 1 / 10 Q1Phenolphthalein Is A Synthetic Indicator And Its Colours In Acidic And Basic Solutions Respectively Are: Red and blue Blue and red Pink and colourless Colourless and pink 2 / 10 Q2Paheli Is Writing Some Statements. She Wants To Know In Which Of The Following Statements Is Or Are Incorrect? Lemon juice and vinegar taste sour because they contain acid. Turmeric and litmus are natural acid base indicator. Indicator phenolphthalein gives yellow colour with lime water. None of the above. 3 / 10 Q3When The Soil Is Too Basic, Plants Do Not Grow Well In It. To Improve Its Quality, What Must Be Added To The Soil? Organic matter Quick lime Slaked lime Calamine solution 4 / 10 Q4Paheli Is Writing Some Statement Which Is Given By Her Teacher. Would You Help Him To Choose The Correct Statements? Q4 Paheli Is Writing Some Statement Which Is Given By Her Teacher. Would You Help Him To Choose The Correct Statements? Litmus and turmeric are natural indicators. An acid and a base neutralise each other to form a salt. All the above. 5 / 10 Q5Boojho Is Writing Some Statements About Indicators. In Which Of The Following Statements Is Or Are Incorrect? Help Him. An indicator tells us whether the substance we are testing is an acid or a base by change in its colour. Litmus, china rose and turmeric are naturally occurring indicators. Phenolphthalein is a synthetic indicator. When litmus is added to a basic solution it turns red. 6 / 10 Q6Consider The Following Statements And Choose The Incorrect Statement(S): China rose indicator is a light pink coloured solution which is extracted from the red flowers of china rose plant with water. Acid turns china rose indicator to magenta (deep pink). Bases turn china rose indicator to blue. If a drop of the given solution turns china rose indicator from light pink to green, then the given solution will be basic in nature. 7 / 10 Q7Which Of The Following Statement Is Or Are Correct? Ascorbic acid is present in amla and citrus fruit (lemon and oranges). Tartaric acid is present in tamarind, unripe grapes and unripe mangoes. Oxalic acid is present in spinach (palak). All the above. 8 / 10 Q8On Adding Phenolphthalein Indicator To A Colourless Solution, No Change Is Observed. What Is The Nature Of This Solution? Basic Either acidic or basic Either acidic or neutral Basic or neutral 9 / 10 Q9Consider The Following Statements, Choose The Incorrect One: When an acidic solution is mixed with a basic solution, they neutralize each other, forming salt and water. Neutral is the solution which does not change the colour of either red or blue litmus. Phenolphthalein gives pink colour in base type of solution. Red litmus gives blue colour in lemon juice. 10 / 10 Q10Products Of A Neutralization Reaction Are Always: An acid and a base An acid and a salt A salt and water A salt and a base Your score isThe average score is 0% LinkedIn Facebook Twitter VKontakte 0% Restart quiz