ALKALINE EARTH METALS

Name: Assignment - IV Class: X Subject: Chemistry

ALKALINE EARTH METALS


I Choose the correct answer

1. [Ne] 3s2 is the electronic configuration of ( )
(a) Be (b) Mg (c) Ca (d) Sr
2. Valence electronic configuration of alkaline earth elements is ( )
(a) ns2 (b) ns2np6 (c) ns2np3 (d) ns1
3. Which of the following property increases from Be to Ra? ( )
(a) EN (b) IE (c) Atomic size (d) EA
4. Which of the following metal gives peroxide in addition to oxide? ( )
(a) Ba (b) Mg (c) Ca (d) Sr
5. Which of the following metal has highest EN? ( )
(a) Be (b) Mg (c) Ca (d) Ba
6. The MP of IIA group elements from top to bottom ( )
(a) Remains same (b) Increases (c) Decreases (d) Does not show any regular trend
7. The BP of IIA group elements from top to bottom ( )
(a) Remains same (b) Show regular trend (c) Decreases (d) Remains same
8. During electrolytic extraction of Mg, the cathode used is ( )
(a) Iron pot (b) Graphite (c) KCl and NaCl (d) Porcelein tube
9. During electrolytic extraction of Mg, the gas released at anode is ( )
(a) H2 (b) O2 (c) Cl2 (d) No gas is released

II Fill in the blanks

1. The chemical formula of magnesite is ___________________
2. The radioactive element of IIA group elements is _____________________
3. In IIA group elements, the atomic radius from top to bottom ____________________
4. In IIA group, the IE from top to bottom ___________________
5. In IIA group elements the electropositive character from top to bottom _____________
6. In IIA group elements the EN from top to bottom __________________
7. In IIA group elements the variation of MP and BP from top to bottom shows __________________ trend.
8. If IIA group elements are made to react with water (or) HCl (or) H2SO4 _______ gas is released




9. The general chemical formula for the hydrides of alkaline earth elements is _________
10. In the hydrides of IIA group elements, hydrogen carries _____________ charge.
11. Group IIA metals are extracted by the _______________ from their molten chlorides.
12. LiAlH4 acts as _______________ agent.
13. BeH2 is prepared from BeCl2 by using _____________________
14. All the alkaline earth chlorides are ionic except ___________________
15. ______________ gas is released at anode during the extraction of Mg by electrolysis.
16. The _______________ is used as cathode during the extraction of Mg by electrolysis.
17. __________________ and _______________ are added to reduce the MP and MgCl2 during electrolysis.
18. The % purity of Mg obtained by electrolysis is _______________
19. __________________ metal burns with dazzling white light when ignited.
20. Mg3N2 is dissolved in water, it releases ______________ gas.


III 1 Mark questions

1. Why does IE of group IIA elements decrease from Be to Ra?
2. Name three ores of magnesium.
3. Why KCl and Nacl are added to MgCl2 during Mg extraction?
4. Which metals are present in dolomite?
5. How many water molecules are present in Epsom salt?

IV 2 Marks questions

1. What are the electrodes used in the magnesium extraction?
2. Why the MP and BP show irregular trend from Be to Ra?
3. Why alkaline earth metals displace hydrogen form H2O?
4. Write about the method of preparation of BeH2?
5. Write reactions at electrodes during extraction of magnesium.

V 4 Marks questions

1. Write the reactions of group IIA elements with
(i) Oxygen (ii) Hydrogen (iii) Chlorine
2. Describe the method of extraction of Mg from its ore.

VI 5 Marks questions

1. Draw the chart showing the extraction of Mg from its ore