NEET Questions Solved

The ground state electronic configurations of the elements, U,V,W,X,and Y (these symbols do not have any chemical significance) are as follows:

                             U        1s22s22p3V         1s22s22p63s1W        1s22s22p63s23p2X         1s22s22p63s23p63d54s2Y         1s22s22p63s23p63d104s24p6

Determine which sequence of elements satisfy the following statements :

(i) Element forms a carbonate which is not decomposed by heating

(ii) Element is most likely to form coloured ionic compounds

(iii) Element has largest atomic radius

(iv) Element forms only acidic oxide

(a) V W Y U                                   (b) V X Y W

(b) V W Y X                                   (d) V X W U

(b) (i) Alkali metal carbonates do not decompose even at red hot V

     (ii) Transition metal ions having unpaired d-electrons are coloured in aq. sol./compounds X

     (iii) In case of Kr van der Waals' radius is considered, which is largest atomic radius Y

     (iv) Si atom has only acid SiO2 W

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