In replacement reaction 

The reaction will be most favorable if M happens to be -

1.  K
2.  Rb
3.  Li
4.  Na

Subtopic:  Reasoning Questions |
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Match List I with List II for the composition of substances and select the correct answer using the code given below:

List-I   Substances

       List-II  
  Composition

(A) Plaster of paris (i) CaSO4. 2H­O
(B) Epsomite (ii) CaSO4.½H2O
(C) Kieserite (iii) MgSO4.7H2O
(D) Gypsum (iv) MgSO4.H2O
(v) CaSO4

Code :

(A) (B) (C) (D)
1. (iv) (iii) (ii) (i)
2. (iii) (iv) (i) (ii)
3. (ii) (iii) (iv) (i)
4. (i) (ii) (iii) (v)
Subtopic:  Biological Importance of S Block Elements and & Its Ore |
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The compound A on heating gives a colourless gas and a residue that is dissolved in water to obtain B. Excess of CO2 is bubbled through an aqueous solution of B. C is a solid. Solid C on gentle heating gives back A. The compound A is -

1. Na2CO3

2. K2CO3

3. CaSO4.2H2O

4. CaCO3

Subtopic:  Chemical Properties |
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Among the following which one has the highest cation to anion size ratio?

1. CsF

2. LiF

3. NaF

4. CsI

Subtopic:  Physical Properties |
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The correct order of the mobility of the alkali metal ions in aqueous solution is :

1. Li+>Na+>K+>Rb+

2. Na+>K+>Rb+>Li+

3. K+>Rb+>Na+>Li+

4. Rb+>K+>Na+>Li+

Subtopic:  Chemical Properties |
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The correct order of increasing thermal stability of K2CO3, MgCO3, CaCO3 and BeCO3 is:

1. BeCO3<MgCO3<K2CO3<CaCO3

2. BeCO3<MgCO3<CaCO3<K2CO3

3. MgCO3<BeCO3<CaCO3<K2CO3

4. K2CO3<MgCO3<CaCO3<BeCO3

Subtopic:  Chemical Properties |
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The alkali metals form salt-like hydrides by the direct synthesis at elevated temperature. 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 |
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In the case of alkali metals, the covalent character decreases in the order

1. MCl>Ml>MBr>MF

2. MF>MCl>MBr>Ml

3. MF>MCl>Ml>MBr

4. Ml>MBr>MCl>MF

Subtopic:  Chemical Properties |
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An oxide that does not react with sodium hydroxide is:
1. B2O3
2. CaO
3. SiO2
4. BeO
Subtopic:  Compounds of Ca and Na -Preparations, Properties & Uses |
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Which one of the following compounds is a peroxide?

1. KO2

2. BaO2

3. MnO2

4. NO2

Subtopic:  Chemical Properties |
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