A mixture of sodium oxide and calcium oxide are dissolved in water, and saturated with excess carbon dioxide gas. The resulting solution...... is It contains ....... :
basic; NaOH and Ca(OH)2
neutral; Na2CO3 and CaCO3
Basic; Na2CO3 and CaCO3
Acidic; NaOH and Ca(OH)2
The compound formed when gypsum is dissolved in aqueous ammonium sulphate solution, is
CaSO4.NH4Cl, H2O
CaCl2.(NH4)2SO4 , H2O
CaSO4.(NH4)2SO4 2H2O
CaCl2, NH4Cl.2H2O
What are the products formed when an aqueous solution of magnesium bicarbonate is boiled?
MgO, H2O, CO2
Mg(HCO3)2, H2O
Mg(OH)2, H2O
Mg, CO2, H2O
In the hardening stage of plaster of paris, the compound formed is
CaSO4
Orthorhombic CaSO4.2H2O
CaSO4.2H2O
Monoclinic CaSO4.2H2O
D.
Monoclinic CaSO4.2H2O
Plaster of paris absorbs water to from monoclinic gypsum which is a hard substance.
CaSO4.H2O
Sodium is heated in air at 300°C to form X. X absorbs CO2 and forms Na2CO3 and Y. Which of the following is Y ?
H2
O2
H2O2
O3
In which of the following reactions, MgO is not formed?
Mg + CO2 →
Mg + dil. HNO3 →
Mg + NO
Mg + B2O3
Observe the following statements:
I. Bleaching powder is used in the preparation of chloroform.
II. Bleaching powder decomposes in the presence of CoCl3 to liberate O3.
III. Aqueous KHF2 is used in the preparation of fluorine.
The correct combination is :
I, II and III are correct
Only II is correct
Only I and III are correct
Only I and II are correct
Which of the following statements are correct for alkali metal compounds ?
(i) Superoxides are paramagnetic in nature.
(ii) The basic strengths of hydroxides increases down the group.
(iii) The conductivity of chlorides in their aqueous solutions decreases down the group.
(iv) The basic nature of carbonates in aqueous solutions is due to cationic hydrolysis.
(i), (ii) and (iii) only
(i) and (ii) only
(ii), (iii) and (iv) only
(iii) and (iv) only
CaOCl2 + H2O → Ca(OH)2 + X
X + CH3CHO → Y
Y + Ca(OH)2 → CHCl3
What is 'Y'?
CH3CH(OH)2
CH2Cl2
CCl3CHO
CCl3COCH3