MCQ
Favourable conditions for electrovalency are
- ✓Low charge on ions, large cation, small anion
- BHigh charge on ions, small cation, large anion
- CHigh charge on ions, large cation, small anion
- DLow charge on ions, small cation, large anion
Lower charge is another favourable factor in the formation of ionic compounds. It is easier to remove smaller number of electrons to form a positively charged cation as a lesser amount of ionization energy has to be supplied. Same is the case for anion formation.
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| List$-I$ Test/Reagents/Observation(s) | List$-II$ Species detected |
| $(a)$ Lassaigne's Test | $(i)$ Carbon |
| $(b)\;Cu ( II )$ oxide | $(ii)$ Sulphur |
| $(c)$ Silver nitrate | $(iii)\;N , S , P ,$ and halogen |
| $(d)$ The sodium fusion extract gives black precipitate with acetic acid and lead acetate | $(iv)$ Halogen Specifically |
The correct match is
$U\,\,\, 1s^2 \,2s^2 \,2p^3$
$V\,\,\, 1s^2\,2s^2 \,2p^6 \,3s^1$
$W\,\,\, 1s^2\,2s^2\, 2p^6\,3s^2\,3p^2$
$X\,\,\, 1s^2\,2s^2\,2p^6\,3s^2\,3p^6\,3d^5\, 4s^2$
$Y\,\,\, 1s^2\, 2s^2\,2p^6\,3s^2\,3p^6\,3d^{10}\, 4s^2\, 4p^6$
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