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The following is the correct order of chemical reactivity with water according to electromotive series-
(B) Electropositive character
In the reaction (super oxide) the metal is -
(C) Among alkali metals super oxides are formed only by K, Rb and Cs.
The reaction of sodium with water is highly exothermic. The rate of reaction can be lowered by-
(D) Sodium amalgam is less reactive than sodium metal.
Pearl ash and caustic potash are chemically-
(A) Pearl ash is ; caustic potash is KOH.
Sodium reacts with water less vigorously than potassium because-
(B) The reactivity of alkali metals increases down the groups.
The density of-
(A). The densities of elements of group 1 are quite low (Li = 0.534 g/cc, Na = 0.972, K = 0.559, Rb = 1.53, Cs = 1.903).
It increases gradually in moving from Li to Cs. However potassium is lighter than sodium probably due to an unusual increase in atomic size of potassium.
Which of the following is amphoteric –
(A) reacts with both acid and bases or dissolves in acids as well as in alkalies.
The reason for the lower basicity of alkaline earth metals than alkali metals is.
(C). Because alkali metals are more electropositive than alkaline earth metals.
In ionic radius of is more while atomic radius of is –
(B). Alkali metals have the largest atomic sizes in their corresponding periods.K+ = 138 pm,
F- 133 pm
Lattice energy is lowest for –
(D). Due to large size of Cs and I atoms.
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