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Anomalous behaviour of Li and Be, diagonal relationship

28 questions on Anomalous behaviour of Li and Be, diagonal relationship from the s-Block Elements chapter: 6 NEET level, 11 JEE Main, 11 JEE Advanced. Each one opens with its answer and solution.

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When lithium burns in excess dry air, the principal oxide formed is NEET level
Which alkali metal combines directly with nitrogen at ordinary temperature to form a nitride? NEET level
The element that shows a diagonal relationship with beryllium is NEET level
Which of the following hydroxides dissolves both in dilute hydrochloric acid and in excess aqueous sodium hydroxide? NEET level
The maximum covalency of beryllium is 4 because NEET level
Which of the following hydrogencarbonates is not known in the solid state? NEET level
Which statement about lithium chloride is correct and distinguishes it from sodium chloride? JEE Main level
Assertion (A): Lithium carbonate decomposes on heating to give Li2O and CO2, whereas sodium carbonate does not decompose at the same temperature. Reason (R): Th... JEE Main level
Match the diagonal pair in Column I with the property in Column II. Column I: (P) Li and Mg; (Q) Be and Al; (R) B and Si. Column II: (1) amphoteric oxides; (2) ... JEE Main level
Which one of the following statements is incorrect? JEE Main level
Take ionic radii Be^2+ = 31 pm and Al^3+ = 54 pm. The ratio (charge/radius of Be^2+) : (charge/radius of Al^3+) is closest to JEE Main level
In solid beryllium chloride, which has a polymeric chain structure with chloride bridges, the hybridisation of each beryllium atom is JEE Main level
When beryllium metal is warmed with aqueous sodium hydroxide, the observation and result are JEE Main level
Lithium is the strongest reducing agent among the alkali metals in aqueous solution (most negative E deg) even though it has the highest ionisation enthalpy in ... JEE Main level
Strong heating of which of these hydroxides gives the oxide and water? JEE Main level
Which reagent can be used to distinguish Be(OH)2 from Mg(OH)2, both being white solids insoluble in water? JEE Main level
Which of the following statements about beryllium compounds are correct? JEE Main level
A light silvery metal M floats on water. It burns in air to give a white mixture of its oxide and a nitride Q. Q reacts with water to give an alkaline gas. The ... JEE Advanced level
Beryllium carbide and aluminium carbide both react with water to give the same hydrocarbon gas G and the corresponding amphoteric hydroxide. If 0.10 mol of Be2C... JEE Advanced level
Beryllium chloride reacts with lithium aluminium hydride in ether as 2BeCl2 + LiAlH4 -> 2X + LiCl + AlCl3. Which statement about X is correct? JEE Advanced level
Equal numbers of moles of anhydrous LiNO3 and NaNO3 are heated strongly until decomposition is complete, giving the oxide and nitrogen dioxide with oxygen for l... JEE Advanced level
A white carbonate P of a period 2 metal imparts a crimson red colour to a flame. On strong heating P gives a gas that turns lime water milky and a solid Q that ... JEE Advanced level
Which of the following are properties shared by lithium and magnesium (but not by the heavier alkali metals)? JEE Advanced level
Which of the following similarities between beryllium and aluminium are genuine? JEE Advanced level
Which of the following statements about beryllium compared with the rest of group 2 are correct? JEE Advanced level
Which of the following lithium compounds are less soluble in water than the corresponding sodium compounds? JEE Advanced level
Take ionic radii (pm): Li+ 76, Na+ 102, Mg^2+ 72, Be^2+ 31, Al^3+ 54, and use charge/radius as the ionic potential. Which inferences are justified? JEE Advanced level
A 5.00 g mixture of anhydrous Li2CO3 and Na2CO3 is heated strongly until constant mass. Only Li2CO3 decomposes (to Li2O and CO2) and the mass falls by 1.00 g. T... JEE Advanced level