Q14 of 30 Page 1

two statements are given- one labeled Assertion (A) and the

other labeled Reason (R). Select the correct answer to these questions from the codes (i), (ii),(iii) and (iv) as given below


Assertion: A fuse wire is always connected in parallel with the mainline.


Reason: If a current larger than the specified value flows through the circuit, fuse wire melts.


A fuse wire is always connected in series with the mainline. In series same current flows through the circuit. When current of higher values flows through the circuit, then the fuse wire melts to prevent the flow of current in the circuit, hence protecting the entire circuit and equipment connected to it.


Hence fuse wires are connected in series with the circuit so that, if heavy current flows, the fuse melts consequently breaking the circuit open.

More from this chapter

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12

(I) The positions of four elements A, B, C and D in the modern periodic table are shown below. Which element is most likely to form an acidic oxide?


 13

Two statements are given- one labeled Assertion (A) and the

other labeled Reason (R). Select the correct answer to these questions from the codes (i), (ii), (iii) and (iv) as given below


i) Both A and R are true and R is correct explanation of the assertion.


ii) Both A and R are true but R is not the correct explanation of the assertion.


iii) A is true but R is false.


iv) A is false but R is true.


Asswertion (A): Following are the structural isomers of Butane



Reason (R): Structural isomers have the same molecular formula but differ in their structures.


 15

a) Write two observations when lead nitrate is heated in a test tube.

b) Name the type of reaction.


c) Write a balanced chemical equation to represent the above reaction.


 16

(I) A compound ‘X’ of Sodium is used as an antacid and it decomposes on strong heating.

a) Name the compound ‘X’ and give its chemical formula.


b) Write a balanced chemical equation to represent the decomposition of ‘X’.


c) Give one use of compound ‘X’ besides antacid.


OR


(II) You are provided with 90 ml distilled water and 10 ml concentrated Sulphuric acid to prepare dilute Sulphuric acid.


a) What is the correct way of preparing dilute Sulphuric acid? Give reasons.


b) How will the concentration of ion change on dilution?