The suspension of slaked lime in water is known as
(C) milk of lime
(d) aqueous solution of slaked lime
(c) Aqueous solution of slaked lime is called lime water whereas suspension solution of slaked lime is called milk of lime.
In context with beryllium, which one of the following statements is incorrect?
(a) It is rendered passive by nitric acid
(b) lt forms Be2C
(c) Its salts rarely hydrolyse
(d) Its hydride is electron-deficient and polymeric
(c) Beryllium salts are covalent in nature because of very small Be2+ ion and its high polarising power, so it is easily hydrolysed, e.g. BeCl2+2H2O Be(OH)2 + 2HCl
On heating which of the following releases CO2 most easily?
(a) K2CO3 (b) Na2CO3
(c) MgCO3 (d) CaCO3
Order of thermal stability is
Hence, MgCO3 releases CO2 most easily
MgCO3 MgO + CO2
Which of the following alkaline earth metal sulphates has hydration enthalpy higher than the lattice enthalpy?
(a) CaSO4 (b) BeSO4
(c) BaSO4 (d) SrSO4
(b) Key Idea Hydration energy varies inversely with size and in sulphates of alkaline earth metals lattice energy remains almost constant.
The order of size of alkaline earth metals is
Thus, the order of hydration energy is
Hence, BeSO4 has the hydration enthalpy higher than the lattice enthalpy.
A compound (A) is used in preparation of washing soda to recover ammonia in Solvay's process. When is bubbled through an aqueous solution of (A), the solution turns milky.It is used in white washing due to disinfectant nature. What is the chemical formula of A?
(a) (b) CaO
is preffered over NaCl for clearing ice on roads particularly in very cold countries. This is because:
(a) is less soluble in than NaCl
(b) is hygroscopic but NaCl is not
(c) Eutectic mixture of freezes at while that of freezes at
(d) NaCl makes the road slippery but does not
(c) Due to much lower freezing point of eutectic mixture of
Which of the following statement is false?
(a) The milk of magnesia used as antacidis chemically
(b) Stability of alkali metal peroxides increases with increase in atomic number
(c) Hydration energy of AgF is higher than its lattice energy
(d) Anhydrous cannot be prepared contains by direct heating of
(a) Milk of magnesia of MgO +