s-Block

A metal M readily forms its sulphate MSO4 which is water-soluble

A metal M readily forms its sulphate MSO₄ which is water-soluble. It forms its oxide MO which becomes inert on heating. It forms an insoluble hydroxide M(OH)₂ which is soluble in NaOH solution. Then M is

One mole of magnesium nitride on the reaction

One mole of magnesium nitride on the reaction with an excess of water gives

one mole of ammonia
two moles of nitric acid
one mole of nitric acid
two moles of ammonia

KO2 (potassium super oxide) is used in oxygen cylinders in space and submarines

KO₂ (potassium super oxide) is used in oxygen cylinders in space and submarines because it

absorbs CO₂
eliminates moisture
produces ozone
absorbs CO₂ and increases O₂ content

Several blocks of magnesium are fixed to the bottom of a ship to

prevent puncturing by under sea rocks
make the ship lighter
prevent action of water and salt
keep away the sharks

The solubilities of carbonates decrease down the magnesium group due to a decrease in

hydration energies of cations
lattice energies of solids
inter-ionic attraction
entropy of solution formation

The substance not likely to contain CaCO3 is

The substance not likely to contain CaCO₃ is

a marble statue
sea shells
dolomite
calcined gypsum

Based on lattice energy and other consider cations which one of the following alkali metal chlorides

Based on lattice energy and other consider cations which one of the following alkali metal chlorides is expected to have the highest melting point?

LiCl
NaCl
KCl
RbCl

The ionic mobility of alkali metal ions in aqueous solution is maximum for

Li⁺
Na⁺
K⁺
Rb⁺

Which one of the following alkaline earth metal sulphates has its hydration enthalpy greater than its lattice enthalpy

Which one of the following alkaline earth metal sulphates has its hydration enthalpy greater than its lattice enthalpy?

BeSO₄
CaSO₄
SrSO₄
BaSO₄