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Fresh milk has a pH of 6. When milk chan...

Fresh milk has a pH of 6. When milk changes into curd, the pH value will:

A

become 7

B

become less than 6

C

become more than 7

D

remain unchanged.

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The correct Answer is:
B
b
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Fresh milk has a pH of 6. When it changes into curd (Yogurt), will its pH value increase or decrease ? Why?

(a) Fresh milk has a pH of 6. When it changes into curd (yogurt), will its pH value increase or decrease ? Why ? (b) Name the gas evolved when dilute HCl reacts with sodium hydrogencarbonate. How is it recognised ? (c) On adding dilute hydrochloric acid to copper oxide powder, the solution formed is blue-green. Predict the new compound formed which imparts a blue-green colour to the solution.

(a) A gas is produced when conc. H_(2)SO_(4) is added to solide sodium chloride taken in a test tube and the tube is heated. The gas coming out through the delivery tube is passed over a dry litmus paper and then over a moist litmus paper. What would you observe ? Explain your answer. (b) Fresh mikl has pH of 6. When it changes to curd (yogurt(, will its pH value increase or decrease? Why ? (c ) What will be the colour of blure limus in a solution of sodium carbonate ?

Fresh milk has a pH of 6. How do you think the pH will change as it turns into curd? Explain your answer.

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