Point out the incorrect statement regarding Be (II) group
(A) It forms an ionic carbide
(B) Its carbonate decomposes on heating
(C) Its halides are covalent
(D) It is easily attacked by water
The atomic volumes of alkali metals are in the order-
(A) Li > Na > K > Rb > Cs (B) Li > Na = K > Rb > Cs
(C) Li < Na < K < Rb < Cs (D) Li < Na < K < Rb = Cs
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) Strongest reducing agent
(B) Poorest reducing agent
(C) Strongest oxidising agent
(D) Poorest oxidising agent
Alkali metals show-
(A) Only +1 oxidation state
(B) Only –1 oxidation state
(C) +1 and +2 oxidation states
(D) –1 and –2 oxidation states.
Considering greater polarisation in LiCl compared to that in NaCl, which of the following statement is wrong –
(A) The m.p of LiCl is lower than that of NaCl
(B) LiCl dissolves more in organic solvent than NaCl
(C) LiCl will ionise in water more than NaCl
(D) Fused LiCl would be less conducing than fused NaCl
A chloride dissolves appreciably in cold water. When placed in a platinum wire in Bunsen flame no distinctive colour is noticed. Which cation could be present –
The compounds of Ca are-
(A) Paramagnetic and colourless
(B) Paramagnetic and coloured
(C) Diamagnetic and coloured, provided their anions are also coloured
(D) Diamagnetic and colourless, provided their anions are also colourless
Calcium hydride can be obtained by heating-
(A) Calcium oxide with hydrogen
(B) Calcium oxide with hydrogen under pressure
(C) Calcium with hydrogen under pressure
(D) Calcium with hydrogen at very low temperature.
Concept Questions :-
Mark the incorrect statement:
(A) Alkali metals are strong reducing agents.
(B) The electropositive nature of alkali metals decreases with increase in atomic number.
(C) Alkali metals have relatively low electronegativity values.
(D) On burning in oxygen lithium forms only the monoxide while other alkali metals form peroxides and or superoxides.