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Practice each question, then open the answer or worked solution.
The alkali metals are low melting. Which of the following alkali metal is expected
to melt if the room temperature rises to 30°C?
Option (iv) is the answer.
Alkali metals react with water vigorously to form hydroxides and dihydrogen.
Which of the following alkali metals reacts with water least vigorously?
Option (i) is the answer.
The reducing power of a metal depends on various factors. Suggest the factor
which makes Li, the strongest reducing agent in aqueous solution.
Option (iii) is the answer.
Metal carbonates decompose on heating to give metal oxide and carbon
dioxide. Which of the metal carbonates is most stable thermally?
Option (iv) is the answer.
Which of the carbonates given below is unstable in air and is kept in CO2
atmosphere to avoid decomposition.
Option (i) is the answer.
Metals form basic hydroxides. Which of the following metal hydroxide is the
least basic?
Option (i) is the answer
Some of the Group 2 metal halides are covalent and soluble in organic solvents.
Among the following metal halides, the one which is soluble in ethanol is
Option (i) is the answer.
The order of decreasing ionisation enthalpy in alkali metals is
Option (iii) is the answer.
The solubility of metal halides depends on their nature, lattice enthalpy and
hydration enthalpy of the individual ions. Amongst fluorides of alkali metals,
the lowest solubility of LiF in water is due to
Option (ii) is the answer.
Amphoteric hydroxides react with both alkalies and acids. Which of the
following Group 2 metal hydroxides is soluble in sodium hydroxide?
Option (i) is the answer.