Trying to find the right answer to this..

Previous Year Papers

Download Solved Question Papers Free for Offline Practice and view Solutions Online.

Test Series

Take Zigya Full and Sectional Test Series. Time it out for real assessment and get your results instantly.

Test Yourself

Practice and master your preparation for a specific topic or chapter. Check you scores at the end of the test.

The s-Block Elements

Short Answer Type

161.

Alkaline earth metals are less electropositive than the alkali metals. Explain.

206 Views

162.
Beryllium and magnesium do not give colour to flame whereas other alkaline earth metals do so. Why?

Beryllium and magnesium do not give colour to flame because they (Be and Mg) have a small size and very high ionisation enthalpies. The enthalpy of the flame is not sufficient to excite their electrons to higher energy levels. Other alkaline earth metals impart colour to the flame because they have fairly low ionisation enthalpies, so electrons in their atoms can be easily excited by the enthalpy of the flame. The excited electrons on returning to their original positions lose enthalpy in the form of coloured light.

654 Views

163.

How will you explain the reducing character of alkaline earth metals?

167 Views

164.

Comment on each of the following observations:
$straight E to the power of circled dash space for space straight M to the power of 2 plus end exponent left parenthesis aq right parenthesis space plus 2 straight e to the power of minus space space rightwards arrow space space straight M left parenthesis straight s right parenthesis.$
(where M = Ca, Sr or Ba) is nearly constant.

149 Views

165.

Explain why alkaline earth metals are poor reducing agents as compared to alkali metals.

342 Views

Long Answer Type

166.

Explain the trend of solubility of carbonate, sulphates and hydroxides of alkaline earth metals ?

784 Views

Short Answer Type

167.

Account for the following:
(i) Be(OH)₂ is amphoteric while Mg(OH)₂is basic.

(ii) Be(OH)₂ is insoluble but Ba(OH)₂ is fairly soluble in water.

377 Views

168. The hydroxides and carbonates of sodium and potassium are easily soluble in water while the corresponding salts of magnesium and calcium are sparingly soluble in water. Explain ?

124 Views