Look at figure which shows solutions taken in test tubes A, B, C and D. What colour is expected when a piece of red litmus paper is dropped in each test tube? Nature of the solutions is given in the table for your help

Academic Chemistry NCERT Class 7

Test tube	Nature of Solution	Change in colour of red litmus
A (milk in water)	Neutral	No change
B (baking powder in water)	Basic	Turns blue
C (vinegar in water)	Acidic	No change
D (glucose in water)	Neutral	No change

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Updated on: 10-Oct-2022

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You are provided with three test tubes A, B and C as shown in figure with different liquids. What will you observe when you put(a) a piece of blue litmus paper in each test tube(b) a piece of red litmus paper in each test tube(c) a few drops of phenolphthalein solution to each test tube?
2 mL of ethanoic acid was taken in each of test-tube I and test-tube II. A red litmus paper was introduced in test-tube I and a pH paper was introduced in test-tube II. The experiment was performed by four students A, B, C and D, they reported their observations as given below :
A student was given four unknown solutions in test-tubes marked A, B, C and D and asked to test them with universal indicator solution. He observed that on putting universal indicator solution, the solutions A, B, C and D turned blue, orange, green and red respectively. The test-tube which contains sodium chloride solution is :(1) A (2) B (3) C (4) D
Look at Figure 4.1 and answer the following questions(a) What change would you observe in the calcium hydroxide solution taken in tube B?(b) Write the reaction involved in test tubes A and B respectively.(c) If ethanol is given instead of ethanoic acid
Equal lengths of magnesium ribbons are taken in test tubes A and B. Hydrochloric acid (HCL) is added to test tube A, while acetic acid (CH3COOH) is added to test tube B. Amount and concentration taken for both the acids are same. In which test tube will the fizzing occur more vigorously and why?
2 mL each of concentrated HCl, HNO3 and a mixture of concentrated HCl and concentrated HNO3 in the ratio of 3: 1 were taken in test tubes labelled as A, B and C. A small piece of metal was put in each test tube. No change occurred in test tubes A and B but the metal got dissolved in test tube C respectively. The metal could beAlAuCuPt
A student added few pieces of aluminium metal to two test tubes A and B containing aqueous solutions of iron sulphate and copper sulphate. In the second part of her experiment, she added iron metal to another test tubes C and D containing aqueous solutions of aluminium sulphate and copper sulphate.In which test tube or test tubes will she observe colour change? On the basis of this experiment, state which one is the most reactive metal and why.
2 mL each of conc. HCl, cone. HNO3 and a mixture of conc. HCl and conc. HNO3 in the ratio of 3: 1 were taken in test tubes labelled as A, B, and C. A small piece of metal was put in each test tube. No change occurred in test tubes A But the metal got dissolved in test tube C. The metal could be.AlAu CuPt.
Aqueous solutions of zinc sulphate and iron sulphate were taken in test tubes I and II by four students A, B, C, and D. Metal pieces of iron and zinc were dropped in the two solutions, and observations made after several hours were recorded in the form of a table as given below:
Aqueous solutions of zinc sulphate and iron sulphate were taken in the test tubes I and II by four students. A, B, C, and D. Metal pieces of iron and zinc were dropped in the two solutions and observations made after several hours and recorded in the form of a table as given below:
Blue litmus solution is added to two test tubes A and B containing dilute HC1 and NaOH solution respectively. In which test tube a colour change will be observed? State the colour change and give its reason.
Aluminium sulphate and copper sulphate solutions were taken in two test tubes I and II respectively. Iron filings were then added to both the solutions. The four students A, B, C and D recorded their observations in the form of a table as given below.
Take three test-tubes. Fill each of them with water. Label them A, B and C. Keep a snail in test-tube A, a water plant in test-tube B and in C, keep snail and plant both. Which test-tube would have the highest concentration of CO2?
Take three test tubes. Fill 3/4th of each with water. Label them A, B, and C. Keep a snail in test tube A, a water plant in test tube B, and in C, keep the snail and plant both. Which test tube would have the highest concentration of CO2?
A student puts a drop of reaction mixture of a saponification reaction first a blue litmus paper and then on a red litmus paper. He may observe that:There is no change in the blue litmus paper and the red litmus paper turns white.There is no change in the red litmus paper and the blue litmus paper turns red.There is no change in the blue litmus paper and the red litmus paper turns blue.No change in colour is observed in both the litmus papers.

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