s-Block Elements
$\mathrm{Mg}\left(\mathrm{NO}_{3}\right)_{2} \cdot \mathrm{XH}_{2} \mathrm{O}$ and $\mathrm{Ba}\left(\mathrm{NO}_{3}\right)_{2} \cdot \mathrm{YH}_{2} \mathrm{O}$, represent formula of the crystalline forms of nitrate salts. Sum of $\mathrm{X}$ and $\mathrm{Y}$ is _____________.
Explanation:
Magnesium nitrate typically crystallizes as a hexahydrate, which means it has six water molecules in its crystal structure. So, X = 6.
On the other hand, barium nitrate commonly crystallizes as an anhydrous salt, meaning it does not incorporate water molecules into its crystal structure. So, Y = 0.
Therefore, the sum of X and Y would indeed be 6 + 0 = 6.
Explanation:
Li does not form superoxide.
K, Rb and Cs form stable super oxides but Cs has ionisation enthalpy less than 400 kJ. While K and Rb have ionisation enthalpy greater than 400 kJ mol–1.
On heating, $\mathrm{LiNO_3}$ gives how many compounds among the following __________
$\mathrm{Li_2O,N_2,O_2,LiNO_2,NO_2}$
Explanation:
$\mathrm{LiNO_3\buildrel \Delta \over \longrightarrow Li_2O+NO_2+O_2}$
BeO reacts with HF in presence of ammonia to give [A] which on thermal decomposition produces [B] and ammonium fluoride. Oxidation state of Be in [A] is ____________.
Explanation:
$ \left(\mathrm{NH}_4\right)_2\left(\mathrm{BeF}_4\right) \stackrel{\text { Heating }}{\longrightarrow} \underset{\text { (B) }}{\mathrm{BeF}_2}+2 \mathrm{NH}_4 \mathrm{~F} $
Oxidation State of Be in $(A)$ is $(+2)$
Reaction of Br2 with Na2CO3 in aqueous solution gives sodium bromide and sodium bromate with evolution of CO2 gas. The number of sodium bromide molecules involved in the balanced chemical equation is ________.
Explanation:
The balanced chemical equation is
3Na2CO3 + 3Br2 $\to$ 5NaBr + NaBrO3 + 3CO2
BeCl2 can be easily hydrolysed.
Chlorination of calcium hydroxide produces bleaching powder.
The crystalline salts of alkaline earth metals contain more water of crystallisation than the corresponding alkali metal salts.
Ca5(PO4)3F + H2SO4 + H2O $\buildrel {Heat} \over \longrightarrow $ ........ + 5CaSO4.2H2O + ........
Carbon dioxide is passed through a suspension of lime stone in water.
Potassium ferricyanide reacts with hydrogen peroxide in basic solution
Carbon dioxide is passed through a concentrated aqueous solution of sodium chloride saturated with ammonia.
Magnesium oxide is used for the lining of steel making furnace.
Calcium phosphate is heated with a mixture of sand and carbon;
An alkaline solution of potassium ferricyanide is reacted with hydrogen peroxide.
Sodium carbonate is made by Solvay process but the same process is not extended to the manufacture of potassium carbonate.