In the case of alkali metals, the covalent character decreases in the order

1. MCl>MI>MBr>MF

2. MF>MCl>MBr>MI

3. MF>MCl>MI>MBr

4. MI>MBr>MCl>MF

Subtopic:  Physical Properties |
 59%
NEET - 2009
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The thermal stability of these hydrides decreases in which of the following orders?

(1) CsH > RbH > KH > NaH > LiH

(2) KH > NaH > LiH > CsH > RbH

(3) NaH > LiH > KH > RbH > CsH

(4) LiH > NaH > KH > RbH > CsH

Subtopic:  Chemical Properties |
 63%
NEET - 2008
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Which of the following compounds has a positive enthalpy of solution?

(1) LiF                                       

 (2) LiCl

(3) LiBr                                       

(4) Lil

Subtopic:  Chemical Properties |
 60%
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Property of the alkaline earth metals that increases with their atomic number is -

1. Solubility of their hydroxides in water.

2. Solubility of their sulphates in water.

3. Ionisation energy.

4. Electronegativity.

Subtopic:  Physical Properties |
 73%
From NCERT
NEET - 2010
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An alkaline earth metal sulphate that has hydration enthalpy higher than the lattice enthalpy is -

1. CaSO4               

2. BeSO4

3. BaSO4               

4. SrSO4

Subtopic:  Chemical Properties | Compounds of Ca and Na -Preparations, Properties & Uses |
 80%
From NCERT
NEET - 2010
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An active ingredient in bleaching powder for bleaching action is -

1. Ca(OCl)2             

2. CaO2Cl

3. CaCl2                 

4. CaOCl2

Subtopic:  Physical Properties | Compounds of Ca and Na -Preparations, Properties & Uses |
 67%
From NCERT
NEET - 2011
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Which of the following metal on burning in moist air does not give the smell of ammonia?

1. Mg                               

2. Ca

3. K                                 

4. Li

Subtopic:  Chemical Properties |
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Among the carbonates of alkali metals which one has highest thermal stability?

(1) Cs2CO3                 

(2) Rb2CO3                     

(3) K2CO3                   

(4) Na2CO3

Subtopic:  Physical Properties |
 62%
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Incorrect statement is:

(a)NaHCO3 and KHCO3 have same crystal structure

(b) On heating LiNO3 decomposes into Li2O and NO2

(c) Among alkali metals, Li metal impart red colour to flame 

(d) Li2SO4 does not form alum 

Subtopic:  Physical Properties |
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The solubility of metal halides depends on their nature, lattice enthalpy and hydration enthalpy of the individual ions. Amongst fluorides of alkali metals, the lowest solubility of LiF in water is due to:

(1) Ionic nature of lithium fluoride             

(2) High lattice enthalpy

(3) High hydration enthalpy of lithium ion

(4) Low ionisation enthalpy of lithium atom

Subtopic:  Physical Properties |
 66%
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