WBBSE Class 10 Physical Science MCQ Questions Chapter 8.2 Ionic and Covalent Bonding

Well structured WBBSE Class 10 Physical Science MCQ Questions Chapter 8.2 Ionic and Covalent Bonding can serve as a valuable review tool before exams.

Ionic and Covalent Bonding Class 10 WBBSE MCQ Questions

Multiple Choice Questions :

Question 1.
Which class of substance is a common component of all electrovalent compounds ?
(A) Metal
(B) Non-Metal
(C) Metalic oxide
Answer:
(A) Metal

Question 2.
In electrovalency which component element gains electron?
(A) The metallic component
(B) All the components
(C) The nonmetallic component
Answer:
(C) The nonmetallic component

Question 3.
Which of the following bonds will be non-polar ?
(A) N-H
(B) C}-H
(C) F-F
(D) O-H
Answer:
(C) F-F

WBBSE Class 10 Physical Science MCQ Questions Chapter 8.2 Ionic and Covalent Bonding

Question 4.
Sodium conducts electricity because :
(A) It is a soft alkali metal
(B) It has only one electron in-the outermost orbit
(C) It has mobile electrons
(D) It gives hydrogen gas with water.
Answer:
(C) It has mobile electrons

Question 5.
Which of the following is more covalent ?
(A) SnCl4
(B) SnBr4
(C) Snl4
Answer:
(C) SnI4

Question 6.
Which of the following is the strongest bond?
(A) F-F
(B) Br-F
(C) Cl-F
(D) 1 – F
Answer:
(A) F-F

Question 7.
The high reactivity of fluoring is due to :
(A) Lower energy of F-F bond
(B) High energy of F-F bond
(C) Fluorine is gas at room temperature.
Answer:
(A) Lower energy of F-F bond

WBBSE Class 10 Physical Science MCQ Questions Chapter 8.2 Ionic and Covalent Bonding

Question 8.
The element with the atomic number 9 can exhibit an oxidation state of
(A) +1
(B) -1
(C) +3
(D) -3
Answer:
(B) -1

Question 9.
Which of the following statements does not fully describe oxygen ?
(A) It is diatomic melecule
(B) It is covalently bonded
(C) It has a single bond
(D) It is low boiling liquid
Answer:
(A) It has a single bond.

Question 10.
Polar bond is formed between two atoms which have :
(A) low ionisation energies
(B) similar electronegativity values
(C) high electron affinities
(D) different electronegativity values
Answer:
(D) different electronegativity values

Question 11.
Which among the following bonds shows the maximum bond strength?
(A) Sigma bond
(B) π-bond
(C) Co-ordinate bond
(D) Hydrogen bond
Answer:
(A) Sigma bond

Question 12.
C-C bond length In saturated compound is :
(A) 1.47 A°
(B) 1.38 A°
(C) 1.54 A°
(D) 1.51 A°
Answer:
(C) 1.54 A

WBBSE Class 10 Physical Science MCQ Questions Chapter 8.2 Ionic and Covalent Bonding

Question 13.
The types of bonds present in CuSO4, 5 H2O are only :
(A) Electrovalent and covalent
(B) electrovalent and co-ordinate covalent
(C) electrovalent, covalent and co-ordianate covalent
(D) covalent and co-ordinate covalent
Answer:
(C) electrovalent covalent and co-ordianate covalent

Question 14.
Which of the following has an electrovalent linkage ?
(A) MgCl2
(B) CH4
(C) SiCl4
(D) BF3
Answer:
(A) MgCl2

Question 15.
Which of the following exists as monoatomlc ?
(A) Sulphur
(B) Helium
(C) Fluorine
(D) Phosphorus
Answer:
(B) Helium

Question 16.
Which of the following compounds is ionic or electrovalent ?
(A) CCl4
(B) CaCl2
(C) SnCl4
(D) PCl5
Answer:
(B) CaCl

Question 17.
Which of the following is the most polar ?
(A) CCl4
(B) CHCl2
(C) CH3 OH
(D) CH3 Cl
Answer:
(B) CH Cl

Question 29.
Percentage of noble gas present in air is :
(A) 5 %
(B) 0.01%
(C.) 1 %
(D) 21 %
Answer:
(C) 1 %

WBBSE Class 10 Physical Science MCQ Questions Chapter 8.2 Ionic and Covalent Bonding

Question 30.
In electrovalent bond there is electron :
(A) between two atoms
(B) between two atoms of molecules
(C) between two molecules
(D) none of these
Answer:
(D) None of these

Question 31.
The shape of NaCl crystal is :
(A) tetrahedral
(B) octahedral
(C) hexagonal
(D) icosohedral
Answer:
(B) Octahedral

Question 32.
How many bonding electrons are there is CO2 ?
(A) 1
(B) 2
(C) 4
(D) 8
Answer:
(D) 8

Question 33.
The number of covalent bonds in C2H4 is:
(A) 4
(B) 5
(C) 6
(D) 7
Answer:
(C) 6

Question 34.
Which compound contains both electrovalency and covalency?
(A) NaCl
(B) HCl
(C) CaCl2
(D) KCN
Answer:
(D) KCN

WBBSE Class 10 Physical Science MCQ Questions Chapter 8.2 Ionic and Covalent Bonding

Question 35.
Which of the following molecules is a heteronuclear covalent compound?
(A) H2
(B) Cl2
(C) NH3
(D) F2
Answer:
(C) NH3

Question 36.
Which one is a covalent compound?
(A) Sugar
(B) Common salt
(C) ethanol
(D) glucose
Answer:
(B) Common salt

Question 37.
Aqueous solution of which of the following will not conduct electricity?
(A) Sodium chloride
(B) Sugar
(C) Hydrochloric acid
(D) Magnesium chloride
Answer:
(B) Sugar

Question 38.
NaCl is an ionic compound. Which of the following statements is correct?
(A) NaCl is solid at room temperature
(B) NaCl is not soluble in water
(C) Aqueous solution of NaCl can conduct electricity
(D) NaCl has high melting point
Answer:
(B) NaCl is not soluble in water

Question 39.
How does calcium obey the octet rule when reacting to form compounds?
A it gains electrons
(B) it gives up electrons
C) it does not change the number of electrons
(D) Calcium does not obey the octet rule
Answer:
(B) it gives up electrons

Question 40.
What is the charge on the cation in the ionic compound sodium sulphide?
(A) 0
(B) +1
(C) +2
(D) +3
Answer:
(B) +1

WBBSE Class 10 Physical Science MCQ Questions Chapter 8.2 Ionic and Covalent Bonding

Question 41.
An element M burns in oxygen to form an ionic compound MO. What shall be the formulla of its chloride?
(A) M2 Cl
(B) MCl
(C) MCl2
(D) MCl3
Answer:
(C) MCl2

Question 42.
Three elements P, Q and R have atomic number 10, 17, 20. Identify the wrong statement.
(A) P is an inert gas
(B) Q is a non-metal
(C) R is a metal
(D) P and R are both inert gas
Answer:
(D) P and R are both inert gas

Question 43.
The property which is characteristic of an lonic compound is that :
A it is a weak electrolyte
(B) It is usually volatile
C) it has high melting point
(D) it often exists as liquid
Answer:
(C) it has high melting point

Fill in the blanks :

1. Covalent compounds do not produce ______ states, so these are non-electrolytes.
Answer:
ions.

2. Almost all the participants in a covalent compound are _______.
Answer:
non-metals.

3. In ammonia molecule, each hydrogen atom is related with one pair of shared _____ so covalency of hydrogen is 1 .
Answer:
electrons.

4. Valency of an element in a covalent compound is measured by its relation to the number of shared ______.
Answer:
electron-pairs.

WBBSE Class 10 Physical Science MCQ Questions Chapter 8.2 Ionic and Covalent Bonding

5. Valency of an element in an electrovalent compound is the number of ______ an atom of it gains or loses in forming the compound.
Answer:
electrons.

6. Chemical bond is a strong force of attraction that holds together _______ in a molecule or crystal.
Answer:
atoms.

7. Electrovalency is the type of chemical bonding established by actual transference of one or more ________ electron (s).
Answer:
valence.

8. In covalency two or more atoms of the same or different non-metallic elements combine chemically by the process of _______ one or more pairs of valence electrons.
Answer:
sharing.

9. Electrovalent compounds are formed by strong attractive electrostatic ________ between ions of opposite charge.
Answer: forces.

10. In the formation of all electrovalent compounds a _______ is involved.
Answer:
metal.

11. Formation of NaCL involves _______ in energy.
Answer:
decrease.

WBBSE Class 10 Physical Science MCQ Questions Chapter 8.2 Ionic and Covalent Bonding

12. Ionic compounds have ________ melting and boiling points.
Answer:
high.

13. NH3 involves covalent bonding but NH4 ion involves _______.
Answer:
co-ordinate bonding.

14. The relative tendency of a bonded atom to attract electrons is expressed by the term _______.
Answer:
electronegativity.

15. Low ionisation energy and high electron affinity favour _______ bond formation.
Answer:
ionic.

16. Covalent compounds are generally soluble in _______ solvents.
Answer:
non-polar.

17. Solid NaCI is a _______ conductor of electricity.
Answer:
bad.

18. Among the compounds, NaCl, KCI, CsCI, the one with the greatest ionic character is _______.
Answer:
CsCI.

19. Helium atom contains _______ electron.
Answer:
two (2)

WBBSE Class 10 Physical Science MCQ Questions Chapter 8.2 Ionic and Covalent Bonding

20. In atom number of protons is equal to number of _______.
Answer:
electrons.

21. Sodium atom contains _______ electron in its outermost shell.
Answer:
one (1).

22. _______ are formed by releasing electrons from atom.
Answer:
Positive ions.

23. An electrovalent compound being composed of ions is soluble in ionising solvents like _______.
Answer:
water.

24. Covalent compounds have _______ melting and boiling point.
Answer:
low.

25. Isomerism is found in _______ compounds.
Answer:
covalent.

25. Chemical reactions of covalent compounds are usually _______.
Answer:
slow.

26. Ionic compounds are soluble in _______ solvents.
Answer:
polar.

27. Theory of covalent bond formation was proposed by _______.
Answer:
Lewis

WBBSE Class 10 Physical Science MCQ Questions Chapter 8.2 Ionic and Covalent Bonding

28. Theory of tonic bond formation was proposed by _______.
Answer:
Kossel

29. Number of bonds present in nitrogen molecules are _______.
Answer:
3

30. Krypton and Xenon were discovered by _______.
Answer:
Ramsay and Traves

31. The atomic number of an element is 17, It should gain _______ electron to attain the electronic configuration of its nearest inert gas.
Answer:
one

32. In forming nitrogen molecule _______ electrons are shared by each atom of nitrogen.
Answer:
3

WBBSE Class 10 Physical Science MCQ Questions Chapter 8.2 Ionic and Covalent Bonding

33. The atomic number of an element is 11, It should lose _______ electron to attain the electronic configuration of its nearest inert gas.
Answer:
one

34. Two chlorine atoms comblne to form a molecule. The bond between them is known as _______ bond.
Answer:
covalent

35. Magnesium chloride is _______ compound.
Answer:
ionic

36. A covalent compound is usually soluble in solvents having _______ dielectric constant.
Answer:
low

37. The chemical bond formed by the sharing of electrons between two atoms is known as _______ bond.
Answer:
covalent

38. Melting point and boiling point of an tonic compound are generally _______.
Answer:
high

State whether the following statement is True or False : VSA

1. Between Na and Na+, Na+is more stable.
Answer:
True

2. Melting points and boiling points of ionic compounds are generally lower than those of covalent compounds.
Answer:
False

WBBSE Class 10 Physical Science MCQ Questions Chapter 8.2 Ionic and Covalent Bonding

3. Ionic compounds consist of tons and not molecules.
Answer:
True

4. An ionic bond is formed between a metal and a non-metal.
Answer:
True

5. Covalent bond is formed when a non-metal combines with another non-metal.
Answer:
True

6. In forming oxygen molecule, 2 electrons are shared by each atom of oxygen.
Answer:
True

7. No bonds are 100 % ionic or 100 % covalent.
Answer:
True

8. Like ionic compounds, covalent compounds can also conduct electricity when in solution.
Answer:
False

WBBSE Class 10 Physical Science MCQ Questions Chapter 8.2 Ionic and Covalent Bonding

9. Ethene (or ethylene) has one double bond and 4 single bonds.
Answer:
True

10. Covalent compounds are usually liquid or gaseous under ordinary temperature and pressure.
Answer:
True

11. Ionic bonds are non directional in nature.
Answer:
True

12. The solution of hydrogen chloride in benzene is not at all acidic.
Answer:
True

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