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The s-Block Elements

Short Answer Type

191.

Starting with CaCO₃, write balanced chemical equation showing the preparation of:
(i) CaO (ii) CaSO₄(iii) Ca(OH)₂ (iv) Ca(HCO₃)₂ solution.

111 Views

Long Answer Type

192.

Describe two important uses of the following;
(a) Caustic soda (b) Sodium carbonate (iii) Quick lime.

403 Views

193.
What happens when,
(i) magnesium is burnt in air
(ii) quick- lime is heated with silica
(iii) chlorine reacts with slaked lime
(iv) calcium nitrate is heated?

(i) Magnesium on burning in the air gives magnesium oxide.

(ii) Quick- lime on heating with silica (SiO₂) gives calcium silicate.

(iii) Chlorine reacts with slaked lime to form calcium hypochlorite.

(iv) Calcium nitrate on heating gives nitrogen dioxide.

318 Views

194.

Discuss the composition and manufacturing details of cement.
Or
Mention the main constituents of Portland cement.

363 Views

Short Answer Type

195.

Complete the following equations:
$left parenthesis straight i right parenthesis space Ca space plus space straight H subscript 2 straight O space space rightwards arrow space space left parenthesis ii right parenthesis space Ca left parenthesis OH right parenthesis subscript 2 space plus space Cl subscript 2 space rightwards arrow space left parenthesis iii right parenthesis space BeO space plus space NaOH space rightwards arrow space left parenthesis iv right parenthesis space BaO subscript 2 space plus space straight H subscript 2 SO subscript 4 space rightwards arrow$

105 Views

196.

Contrast the action of heat on the following and explain your answer:
(i) Na₂CO₃ and CaCO₃(ii) MgCl₂.6H₂O and CaCl₂.6H₂O
(iii) Ca(NO₃)₂ and NaNO₃.

226 Views

197.

Explain the significance of magnesium and calcium in biological fluids.

186 Views

198.

What are the common physical and chemical features of alkali metals?

377 Views

199.

Discuss the general characteristics and gradation in properties of alkaline earth metals.

505 Views

200.

Compare the alkali metals and alkaline earth metals with respect to (i) ionisation enthalpy (ii) basicity of oxides and (iii) solubility of hydroxides.

194 Views