Question

Answer the following questions.​

Answer 1

Answer:

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1. 2Pb(NO3)2(S) --->2PbO(s) + 4NO2(g) + O2(g)

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2.pH value decreases when fresh milk charges to curd . It is because curd contains lactic acid. Since acids generally have a low pH value, when fresh milk changes to curd its pH will decrease.

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3.hydrochloric acid may be used as a reducing agent to obtain manganese from Manganese dioxide

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4.light has different speed in different media and it take such a path of propagation for which time taken is minimum .

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answer ✨✌

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Answer 2

Answer:

1. 2Pb(NO3)2 in the presence of heat gives 2pbo + 4n02 g + o2 g
2. Ph value decreases when fresh milk is changes into curd