The strongest factor responsible for reducing action of Li metal in an aqueous solution is :

1. Sublimation enthalpy .         

2. Ionisation enthalpy.

3. Hydration enthalpy .             

4. Electron-gain enthalpy.

Subtopic:  Physical Properties |
 80%
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The effect of addion of gypsum to cement is-

1. It reduces the setting time of cement .    

2. The setting time of cement increases.

3. The colour of cement becomes light .          

4. A shining surface is obtained.

Subtopic:  Reasoning Questions | Compounds of Ca and Na -Preparations, Properties & Uses |
 64%
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A compound (A) is used in the preparation of washing soda to recover ammonia in Solvay's process. When CO2 is bubbled through an aqueous solution of (A), the solution turns milky. It is used in whitewashing due to its disinfectant nature. The chemical formula of A is : 

1. CaHCO32                       

2. CaO

3. CaOH2                           

4. CaCO3

Subtopic:  Compounds of Ca and Na -Preparations, Properties & Uses |
 61%
From NCERT
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Which of the following statement about the sulphate of alkali metal is correct?

1. Expect Li2SO4 all sulphate of other alkali metals are soluble in hot water

2. All sulphate salts of alkali metals except lithium sulphate forms alum.

3. All sulphate salts of alkali metals except lithium sulphate do not decompose at high temperature 

4. All of the above

Subtopic:  Chemical Properties |
 74%
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When a standard solution of NaOH is left in air for a few hours :

(1) a precipitate will form

(2) strength of solution will decrease

(3) the strength of solution will increase

(4) the concentration of Na+.ion in solution will remains same

Subtopic:  Preparations, Properties & Uses of S Block Elements |
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CaCl2 is preferred over NaCl for clearing ice on roads particularly in very cold countries. This is because:

1. CaCl2 is less soluble in H2O than NaCl.

2. CaCl2 is hygroscopic but NaCl is not.

3. Eutectic mixture of CaCl2/H2O freezes at -55°C while that of NaCl/H2O freezes at -18°C.

4. NaCl makes the road slippery but CaCl2 does not.

Subtopic:  Compounds of Ca and Na -Preparations, Properties & Uses |
 51%
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Which metal bicarbonates does not exist in solid state?

(i) LiHCO3       (ii) CaHCO32     (iii) ZnHCO32      (iv)AgHCO3

(1) i,ii,iii,iv                           

(2) i,ii,iii

(3) i,ii,iv                               

(4) ii,iii,iv

Subtopic:  Physical Properties |
 52%
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The incorrect statement among the following is-

1. The milk of magnesia used as an antacid is chemically MgO + MgCl2

2. Stability of alkali metal peroxides increases with an increase in atomic number.

3. Hydration energy of AgF is higher than its lattice energy.

4. Anhydrous MgCl2 cannot be prepared by direct heating of MgCl2 . 6H2O

Subtopic:  Compounds of Ca and Na -Preparations, Properties & Uses |
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Calcium imide on hydrolysis gives gas (B) which on oxidation by bleaching powder gives gas (C). Gas (C) on reaction with magnesium give compound (D) which on hydrolysis gives again gas (B)> Identify (B), (C) and (D).

(1) NH3, N2, Mg3N2 

(2) N2, NH3, MgNH

(3) N2, N2O5, MgNO32 

(4)NH3 ,NO2, MgNO22 

Subtopic:  Chemical Properties |
 56%
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Which of the following order is correct?

1. K+<Ca2+<p3-<S2-: Ionic size

2. Naaq.+>Kaq.+>Rbaq.+>Csaq.+: Electrical conductance

3. Alaq.3+>Mgaq.2+>Naaq.+: Hydrated size

4. Iaq.-<Braq.-<Claq.-<Faq.-: Ionic mobility

Subtopic:  Physical Properties |
 59%
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