Page 61 - Chemistry ICSE Class X

Chemical Bonding 49

ASSIGNMENT 5

Polar and nonpolar covalent bonds, Coordinate bond

ϭ͘ EĂŵĞ ŽŶĞ ĞĂĐŚ ŽĨ ƚŚĞ ĐŽŵƉŽƵŶĚ ĐŽŶƚĂŝŶŝŶŐ Ă ;ĂͿ ƉŽůĂƌ͕ ĂŶĚ ;ďͿ ŶŽŶƉŽůĂƌ ĐŽǀĂůĞŶƚ ďŽŶĚ͘
Ϯ͘ ,Žǁ ĚŽĞƐ Ă ƉŽůĂƌ ĐŽǀĂůĞŶƚ ďŽŶĚ ĚŝīĞƌ ĨƌŽŵ Ă ŶŽŶƉŽůĂƌ ĐŽǀĂůĞŶƚ ďŽŶĚ͍
ϯ͘ tŚĂƚ ĂƌĞ ƚŚĞ ďŽŶĚ ƚLJƉĞƐ ƉƌĞƐĞŶƚ ŝŶ ĞĂĐŚ ŽĨ ƚŚĞ ĨŽůůŽǁŝŶŐ͍
;ĂͿ tĂƚĞƌ
;ďͿ ĂƌďŽŶ ƚĞƚƌĂĐŚůŽƌŝĚĞ
;ĐͿ DĞƚŚĂŶĞ
;ĚͿ ŵŵŽŶŝĂ
ϰ͘ ;ĂͿ ^ŚŽǁ ƚŚĞ ĨŽƌŵĂƟŽŶ ŽĨ ŚLJĚƌŽŶŝƵŵ ŝŽŶ ƚŚƌŽƵŐŚ Ă ƐƵŝƚĂďůĞ ĞůĞĐƚƌŽŶ ĚŽƚ ĚŝĂŐƌĂŵ͘
;ďͿ ^ŚŽǁ ƚŚĞ ŝŶǀŽůǀĞŵĞŶƚ ŽĨ ƚŚĞ ůŽŶĞ ƉĂŝƌ ŽĨ ĞůĞĐƚƌŽŶƐ ŽŶ ŽdžLJŐĞŶ ĂƚŽŵ ŝŶ ƚŚĞ ĨŽƌŵĂƟŽŶ ŽĨ ŚLJĚƌŽŶŝƵŵ ŝŽŶ͘
ϱ͘ ;ĂͿ tŚĂƚ ŝƐ ůŽŶĞͲƉĂŝƌ ŽĨ ĞůĞĐƚƌŽŶƐ͍
;ďͿ 'ŝǀĞ ĂŶ ĞdžĂŵƉůĞ ŽĨ Ă ŵŽůĞĐƵůĞ ŝŶ ǁŚŝĐŚ ƚǁŽ ůŽŶĞͲƉĂŝƌƐ ŽĨ ĞůĞĐƚƌŽŶƐ ĂƌĞ ůŽĐĂƚĞĚ ŽŶ ƚŚĞ ŽdžLJŐĞŶ ĂƚŽŵ͘

Let us Answer Some More Questions

+
1. 9JKEJ PQDNG ICU GNGOGPV JCU CP GNGEVTQPKE EQPſIWTCVKQP NKMG VJCV QH .K ?
2. How many double covalent bonds are there in one molecule of carbon dioxide?
+
3. The atomic numbers of sodium and chlorine are 11 and 17, respectively. How many electrons are there in Na
–
and Cl ?
4. 9JCV KU QEVGV TWNG! 0COG VYQ GNGOGPVU YJKEJ FQ PQV TGSWKTG VJKU EQPſIWTCVKQP FWTKPI DQPF HQTOCVKQP
5. Show the locations of covalent and ionic bonds in NaOH molecule.
6. Give one example and one characteristic of the electrovalent compounds.
7. Why do two lithium atoms react with one atom of oxygen?
8. What type of bonds are present in the following molecules? (a) H (b) CH .
2
4
9. What is a covalent bond? What type of bond exists in, (a) CCl (b) CaCl ?
4
2
10. An element X is in the third group of the periodic table. What is the formula of its oxide?
11. &TCY VJG GNGEVTQP FQV UVTWEVWTGU HQT VJG HQNNQYKPI 0 , CO , HCN and O .
2
2
3
12. (a) State one major difference between covalent and ionic bonds.
(b) Give one example each of the covalent and electrovalent (ionic) compounds.
13. Elements X and Y belong to 1 and 17 groups of the periodic table, respectively.
(a) What will be the nature of bond in the compound XY?
(b) Give two properties of XY.
14. X, Y and Z are the atoms of the elements having atomic numbers 9, 19 and 34, respectively.
C 9TKVG VJG GNGEVTQPKE EQPſIWTCVKQPU QH : ; CPF <
(b) Predict the type of bonding between, (i) X and Y, (ii) X and Z, (iii) Y and Z.
15. Atoms of the elements A, B, C and D have 1, 4, 6 and 7 valence electrons, respectively. Draw the electron dot
structures of two ionic and two covalent compounds that might be formed due to reaction between different
pairs of these atoms.
16. An element A has 4 valence electrons in its atom, whereas element B has only one valence electron in its atom.
The compound formed by A and B does not conduct electricity. What is the nature of chemical bond in the
compound formed? Give its electron dot structure.