A metal [X] heating on nitrogen gas gives [Y]. [Y] on treatment with H2O gives a colourless gas which when passed through CuSO4 solution gives a blue colour. [Y] is-

1. MgNO32                                     

2. Mg3N2

3. NaN3                                             

4. MgO

Subtopic:  Compounds of Ca and Na -Preparations, Properties & Uses |
 67%
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In the reaction M+O2MO2 (superoxide) the metal is -

1. Li                 

2. Na

3. K                 

4. Ba 

Subtopic:  Chemical Properties |
 82%
From NCERT
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Sodium reacts with water less vigorously than potassium because-

1. It has a higher atomic weight.

2. It is less electropositive .

3. It is more electronegative. 

4. It is a metal .

Subtopic:  Chemical Properties |
 74%
From NCERT
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The correct relation about the density of Na and K is 

1. Na > K                                                     

2. Na = K

3. K > Na                                                     

4. Li > K

Subtopic:  Physical Properties |
 78%
From NCERT
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The reason for a lower basicity of hydroxides of alkaline earth metals than alkali metals is : 

1. Alkali metals form ionic compounds.

2. The bond strength of oxygen is more for alkali metals.

3. The electropositivity of alkali metals is more than alkaline earth metals.

4. The electropositivity of alkali metals is less than alkaline earth metals.

Subtopic:  Physical Properties |
 80%
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The number of crystal water in Gypsum, Plaster of Paris and Epsom salt respectively are-

1. 2, 0.5, 7                                             

2. 7, 2, 1

3. 7, 0.5, 2                                             

4. 3, 4, 2

Subtopic:  Compounds of Ca and Na -Preparations, Properties & Uses |
 84%
From NCERT
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An amphoteric oxide among the following is-

1. CaO                                                     

2. SrO

3. BeO                                                     

4. MgO

Subtopic:  Physical Properties |
 88%
From NCERT
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The incorrect statement among the following regarding Lithium is that-

1. The hydroxide, carbonate and nitrate decompose to give the oxide on heating.

2. It is the most electronegative element of group IA.

3. The hydrogen carbonate cannot be isolated as a stable solid.

4. It forms superoxide.

Subtopic:  Physical Properties |
 81%
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The largest value of Ksp among the following is -

1. BeSO4                                           

2. MgSO4

3. CaSO4                                       

4. BaSO4

Subtopic:  Physical Properties |
 63%
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The polarising power of Mg is close to that of –

1. Na                                       

2. Cs

3. Li                                         

4. K

Subtopic:  Physical Properties |
 83%
From NCERT
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