Practice free Classification of elements and Periodicity in properties (Chemistry) NEET multiple-choice questions online with instant answers and detailed explanations. No login required.
Which of the following compounds may be soluble in pyridine-
(C). Due to high positive charge density on , it forms compounds with maximum covalent character. So lithium chloride may be soluble in pyridine.
Which of the following statement regarding isolation of Na and K metal is true –
(D). Sodium and potassium can be prepared by the electrolysis of their fused chlorides but not from aqueous solutions of their salts, because these metals are very reactive.
Which of the following is a false statement-
(C). The thermal stability of calcium carbonate is more as compared to that of beryllium carbonate. The ionic potential () value of is more than that of . So attracts the oxygen of more and on heating beryllium carbonate losses more easily.
The basic character of oxides MgO, SrO, , NiO and increases in the order –
(C). Alkali metal oxides are more basic than alkaline earth metal oxides and basic nature increases as we move down the group.
Assertion : s-block elements do not occur free in nature
Reason : s-block elements are highly electropositive in nature.
(A). The s-block elements are highly electropositive in nature. So, these are very reactive. That is why these elements do not occur free in nature. Usually, the s-group elements occur in nature as halides, carbonates and sulphates. These metals are obtained from their molten halides by electrolytic reduction.
Assertion : The alkaline earth metals have much higher melting and boiling points than those of the alkali metals.
Reason : The melting and boiling points of alkaline earth metal do not vary in a regular fashion.
(B). Atom/ions of alkaline earth metals are smaller than the corresponding alkali metals. These atoms/ions are packed more closely in their lattices. Alkaline earth metals have two valence electrons and alkali metals have only one. Larger number of valence electrons leads to stronger interatomic interactions in alkaline earth metals. As a result, therefore, the melting and boiling points of alkaline earth metals are higher than those of alkali metals.
Assertion : The ionisation enthalpies of alkaline earth metals are fairly low.
Reason : In general, the low ionisation enthalpies of alkaline earth metals are due to large size of their atoms.
(A). Alkali metals have only one valence electron, while alkaline earth metals have two valence electrons. After the only outermost electron is removed from the atom of an alkali metal, the ion formed has a stable configuration of the nearest noble gas. Removal of another electron from the unipositive ion of alkali metal, therefore, would require very large amount of energy.
Both Be and Al become passive on reaction with concentrated nitric acid due to:
Both Be and Al are rendered passive due to formation of inert, insoluble and impervious oxide layer on their surface.
Which does not show inert pair effect
Al does not show inert pair effect due to unavailability of d subshell.
Mark the oxide which is amphoteric in character
CO2 - acidic,
CO - neutral,
SnO2 - amphoteric,
CaO - basic
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