Chemistry
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New answer posted
a year agoContributor-Level 10
This is a short answer type question as classified in NCERT Exemplar
(i) As the size of the cation increases, the thermal stability of carbonate increases. The more stable will be the oxide of an alkaline earth metal, the less stable will be the carbonate. Hence, beryllium carbonate will be highly unstable because its oxide will be stable.
(ii) Alkali metals and alkaline earth metals form oxides with oxygen and give metal oxides. The oxides are basic in nature. BeO is an exception because BeO is amphoteric.
They also react with water to form sparingly soluble hydroxides. On increasing the size of the cations beryllium oxide and magnesiu
New answer posted
a year agoContributor-Level 10
This is a short answer type question as classified in NCERT Exemplar
The element from group 2 is beryllium. Be (OH)2 is amphoteric. It reacts with both acids and bases. It reacts with acid to form beryllium chloride and it reacts with base to form beryllate ion which is soluble in sodium hydroxide. The reaction is shown below.
Be (OH)2+2OH−→ [Be (OH)4]2−
Be (OH)2+2HCl→BeCl2+2H2O
Beryllium sulfate are readily soluble in water.
New answer posted
a year agoContributor-Level 10
This is a Matching Type Questions as classified in NCERT Exemplar
59. (i) → (a); (ii) → (b); (iii) → (b) : (iv) → (c)
New answer posted
a year agoContributor-Level 10
This is a short answer type question as classified in NCERT Exemplar
These two elements have similar properties because of their similar atomic and ionic radii.
(i) Both are lighter element and harder than the other metals in their respective groups.
(ii) The halides of both elements, LiCl and MgCl2 are soluble in ethanol.
New answer posted
a year agoContributor-Level 10
This is a Matching Type Questions as classified in NCERT Exemplar
58. (i) → (a); (ii) → (a); (iii) → (b)
New answer posted
a year agoContributor-Level 10
This is a short answer type question as classified in NCERT Exemplar
(i) O22−+ 2H2O → H2O2+2OH−
(ii) 2O2−+2H2O→2OH−+H2O2+O2
New answer posted
a year agoContributor-Level 10
This is a Matching Type Questions as classified in NCERT Exemplar
57. (i) → (c); (ii) → (f); (iii) → (b) : (iv) → (a); (v) → (d) ; (vi) → (e)
New answer posted
a year agoWhen heated in air, the alkali metals form various oxides. Mention the oxides formed by Li, Na and K
Contributor-Level 10
This is a short answer type question as classified in NCERT Exemplar
Alkali metals forms oxide when reacted with air. Lithium forms monoxide, sodium forms peroxide and potassium forms superoxide.
4Li+O2→2Li2O
Na+O2→Na2O2
K+O2→KO2
New answer posted
a year agoContributor-Level 10
This is a short answer type question as classified in NCERT Exemplar
Lithium has the highest negative reduction potential value. Due to the small size of lithium it has the highest ionization enthalpy. Due to this, the reducing power of lithium is the highest in an aqueous solution.
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