Which of the following bonds is most polar? B-H o-h p-H al-h c-h Which of the fo

Question

Which of the following bonds is most polar? B-H o-h p-H al-h c-h Which of the following statement' tiding allotropes is NOT correct? allotropes of an element have different structures allotropes of an have different chemical and physical properties Not all element' have crouch multiple allotropes Oxygen and are examples of allotropes Carbon dioxide and carbon monoxide are examples of allotropes The formal charge of an atom in a Lewis include it as the difference between the lumber of hooding electrons and nonbonding electron assigned to an atom -x the difference between the numb of valence electrons m a free atom and the total number of valence electron in the molecule the difference between the number of valence electrons in a tree atom and the number of electrons assigned to it in a structure the difference between the number of valence electrons in a free atom and the number of bonding electrons assigned to it. the difference between the number of valence electrons m a fre

Explanation / Answer

9. The bond which is most polar between the atoms, the electronegativity difference between the atoms should be maximum. If we compare electronegativity of the given atoms, O is most electronegative. Answer is b.

10. Allotropes are different forms in which element can exist. Not all the elements have allotropes and they have different properties and different structures. Ozone is an allotrope od oxygen. But carbon dioxide and carbon monoxide are not allotropes. Because they are compounds of different elements and not allotropes. Answer is e.

11. Formal charge of an atom in a lewis structure is defined as the difference between the number of valence electrons in a free atom and the number of electrons assigned to it in a lewis structure. Answer is c.

12. H-F will have the highest bond energy because of the difference in electronegativity is highest in H-F. H-I will have the lowest. Answer is d.

13. sp3 hybridisation means the compound contains single bond. In the given compounds, CH3Cl will have sp3 hybridization. Answer is c.

14. Molar mass of PCl5:

atomic mass of P = 31 g/mol

Atomic mass of Cl = 35.5 g/mol

So molar mass of PCl5 = 31 + 5(35.5) = 208.5 g/mol

Answer is c.

15. Answer is c. A mole of CO2 contains 2 moles of O atoms. Option e is incorrect because naturally occuring carbon also contains C14. So, 1 mole cannot be equal to number of atoms in 12 g of naturally occurinf carbon.

16. 1 mol of any compound contains number of atoms in the compound multiplied by avogadro number.

1 mol of H2O = 3*NA atoms

1 mol PCl3 = 4*NA

1 mol of N2O5 = 7*NA

2 mol CO = 2*2*NA = 4*NA

Answer is c.

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