Which of the following substances are para-magnetic?
$B i, A l, C u, C a, P b, N i$

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Solution

These are metals that are weakly attracted to magnets. The atoms of these substances contain electrons most of which spin in the same direction but not all This gives the atoms some polarity. They are only weakly influenced by a magnetic field and since some of the atoms can be turned to point their poles in the same direction, these metals can become very weak magnets. Their attractive force can only be measured with sensitive instruments. Hence Aluminium (Al) and Calcium (Ca) are paramagnetic.

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Match the following.

Set -I Set -II

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$P b, A u, M g, S n, F e, A l, A g, H g, N a, Z n, C u, C a$

H N O_{3}

B a S O_{4}, C u S, P b S, H g S

L i

K

C a

N a

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A l

Z n

F e

P b

C u

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I

Z n (s) + C u {({N O}_{3})}_{2} (a q) \to C u (s) + Z n {({N O}_{3})}_{2} (a q)

I I

N a O H

(X) : P b {(O H)}_{2}

(Y) : C u S

(Z) : A l {(O H)}_{3}

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