Practice free Classification of elements and Periodicity in properties (Chemistry) NEET multiple-choice questions online with instant answers and detailed explanations. No login required.
Ionic conductances of hydrated M+ ions are in the order-
(D). Due to high charge density of is attracts more water molecules and becomes bulky so the ionic conductances of ions increase from ion to ion.
Among the following groups of oxides, the group containing oxides that cannot be reduced by carbon to give the respective metals is –
(B). Alkali and alkaline earth metals are strong reducing agents. Hence they can not be prepared by the reduction of their oxides.
Which of the following is an amphoteric oxide-
(C). BeO, because it is least electropositive in its group. Therefore, instead of basic oxide, it forms amphoteric oxide.
Which one of the following about compounds of lithium is false –
(D). Lithium forms an oxide , but not the peroxide or super oxide, because strong polarising power of small sized ion is strong enough to restrict the oxidation of an oxide ion to the peroxide ion, .
Which of the following properties of alkali metals increases in magnitude as the atomic number increases –
(A). Ionic radius increases as the atomic number of alkali metal increases.
Which of the following statements is correct.
(B). Because of small size, they are more closely packed in the crystal lattice. So they have comparatively stronger metallic bonds and so more denser and harder than alkali metals.
Li has the maximum value of ionisation potential among alkali metals i.e. lithium has the minimum tendency to ionise to give ion. Thus, in aq. solution lithium is-
(A). The ionisation potential value of Lithium is maximum among alkali metals i.e. its tendency to ionise to give ions should be the minimum i.e. Li should be the poorest reducing agent. But, lithium is the strongest reducing agent in aq. solution. This is due to the largest value of hydration energy of ions.
The compounds of Ca are-
(D). The divalent ion has no unpaired electron, hence, its compounds are diamagnetic and colourless, provided their anions are also colourless.
Calcium hydride can be obtained by heating-
(C).
Mark the incorrect statement:
(B). Since ionisation energy decreases on moving down the group, the electropositive character increases on moving down from lithium towards cesium.
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