Q. No.Which of the following order is correct?
(1) LiCl<NaCl<KCl (solubility in water)
(2) BaO>SrO>CaO (acidic nature)
(3) MgCl2<MgBr2<MgI2 (Solubility in acetone)
(4) Li2CO3>Na2CO3>K2CO3 (thermal stability)
Sodium carbonate exists as
(1) Na2CO3.10H2O(s)
(2) Na2CO3.H2O(s)
(3) Na2CO3
(4) In all forms its a matter of temperature
The pair of compounds which do not exist in solution together?
(1) NaHCO3 and NaOH
(2) NaHCO3 and H2O
(3) NaHCO3 and Na2CO3
(4) Na2CO3 and NaOH
Among the following, the most basic oxide is [KVPY SA 2012]
(1) Al2O3
(2) SiO2
(3) P2O5
(4) Na2O
Which of the following represents probable order of mobility of ions in aqueous solution?
(1) Be2+<Mg2+<Na+<K+
(2) Be2+>Mg2+>Na+>K+
(3) Na+>K+>Be2+>Mg2+
(4) Na+<K+<Be2+<Mg2+
Which of the following statements regarding Be is incorrect?
(1) It forms ionic compounds almost exclusively, even with the highly electronegative elements
(2) It does not form ionic compounds containing simple Be2+ ion, but does readily achieve a maximum co-ordination number of four through formation of complex ions such as BeF4 and [Be(H2O)4]2+
(3) It forms a series of organo derivatives BeR2 and [BeR3], which contain covalent Be-C bonds
(4) Its halides are covalent polymers that are readily hydrolysed or cleaved by donors
CO2 gas along with solid (y) is obained when sodium salt (x) is heated. (x) is again obtained when CO2 gas is passed into aqueous solution of (y), (x) and (y) are
(1) Na2CO3.Na2O
(2) Na2CO3, NaOH
(3) NaHCO3, Na2CO3
(4) NaCO3, NaHCO3
A substance that gives a brick red flame and breaks down on heating giving oxygen and a brown gas is-
1. Calcium carbonate.
2. Magnesium carbonate.
3. Magnesium nitrate.
4. Calcium nitrate.
A chemical compound A is used for water softening to remove temporary hardness. A reacts with Na2CO3 to form caustic soda. When CO2 is bubbled through A it becomes cloudy. The chemical formula of A is
(1) CaO
(2) Ca(OH)2
(3) Ca(HCO3)2
(4) CaCO3
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