Question

which of the following materials can be classified as malleable?
(a) Sand, because it has the ability to flow
(b) Air, because it can move from one place to another
(c) Iron, because it can be beaten into thin sheets
(d) Water, because it can change its shape when put in different container

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Answer 1

Answer:

Given

a

2

=13 and a

5

=25

We know that

a

n

=a+(n−1)d

∴a

2

=a+(2−1)d

⇒13=a+(2−1)d

⇒a+d=13 ...(i)

and a

5

=a+(5−1)d

⇒25=a+4d

⇒a+4d=25 ...(ii)

Now, subtracting (i) from (ii), we get

3d=12

⇒d=4

Now a+d=13 [from (i)]

⇒a=9

Hence, a

7

=a+6d=9+6(4)

⇒a

7

=33

Answer 2

Answer:

iron because it is a metal n metals are malleable. All others are non metals.