Q.

Which of the following can be classified as a compound?

(i) CO

(ii) Na

(iii) NO

(iv) Co
 

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a

 (ii) and (iv)

b

(i) and (iii)

c

 (i) and (ii)
 

d

 (ii) and (iii)

answer is C.

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Detailed Solution

A compound is a chemically bound group of two or more atoms of different elements that are electrically neutral.

Since NO and CO are made up of atoms from two different elements, they are compounds. Na and Co, on the other hand, are elements made up of one sort of atom.
 

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