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Chemistry MCQs 1st year chemistry MCQs start now

1. The concept of a dative bond was given by
   a)W.Kossel
   b)G.N Lewis
   c)Sidgwick
   d)Linus Pauling
   Ans: Sidgwick
2. Which of the following bonds has higher bond energy?
   a)C=C
   b)C=C:
   c)C-C
   d)N=N
   Ans: N=N
3. Which of the following compounds is insoluble in water?
   a)Na2SO4
   b)K2SO4
   c)BeSO4
   d)CaSO4
   CaSO4
4. The triple bond is generally__°A shorter a single bond.
   a)0.54
   b)0.34
   c)0.24
   d)0.21
   0.34
5. The π-bond is formed due to the overlapping of orbitals.
   a)Lateral
   b) Sideways
   c) End on
   d)Both a b
   Both a b
6. The central atom in the following compound is sp3 hybridized.
   a)POCl₃
   b)H₂SO₄
   c)PH₃
   d)NOT
   NOT
7. Na⁺¹ has a number of electrons in its valence shell.
   a)One
   b)Two
   c)Four
   d)Eight
   Eight
8. The dipole moment of water is
   a)6.137×10^-30Cm
   b)1.84D
   c)Both a b
   d)NOT
   Both a b
9. Process of overlapping is more effective between orbitals.
   a)p-p
   b) s-p
   c)s-s
   d)AOT
   p-p
10. The strongest bond is
    a)H-H
    b)H-O
    c) H-N
    d)H-Cl
    H-O
11. In Which of the following molecules has a coordinate covalent bond?
    a)NH₄Cl
    b)AlCl₃
    c)Cl₂
    d)NaCl
    NH₄Cl
12. In a double covalent bond, there is sharing of ….. electrons.
    a)2
    b)4
    c)1 electron
    d)AOT
    4
13. The crystal structure of ice shows the tetrahedral arrangement of H2O due to
    a)Ionic bond
    b)Hydrogen bond
    c)Covalent bond
    d)NOT
    Hydrogen bond
14. Which one has a pyramidal structure?
    a) CH₄
    sb) H₂0
    c) C0₂
    d) NH₃
    NH₃
15. Which bond is formed b/w alkali metals and halogens?
    a) Ionic
    b) Covalent
    c) Dative.
    d) Metallic
    Ionic
16. If ∆. E.N b/w two atoms equal 1.7, the bond will have ionic character (approx:).
    a) 100%
    B) 50%
    c) 20%
    d) 10%
    50%
17. If electron waves of two overlapping atomic orbitals cancel each other the resulting molecular orbital Will be
    a) Bonding
    b) Anti bonding
    c) Non-bonding
    d) Zero
    Anti bonding
18. The lowest melting point in solids have
    a) Covalent bonds
    b) ionic bonds
    c) vander waals bonds
    d) Metallic bonds
    Vander Waals bonds
19. In Which of the following compounds 0 dipole moment?
    a)Methyl chloride
    b) Carbon tetrachloride
    c) Chloroform
    d) Dichloromethane
    Carbon tetrachloride
20. Which has the largest bond length
    a) F2
    b) C12
    c) Bra2
    d) I2
    I2
21. Which of the following bonds is least stable?
    a) s-s
    b) s-p
    c) p-p (face to face)
    d) p — p (sidewise)
    p — p (sidewise)
22. Which has more heat of neutralization.
    a) HCl and NaOH
    b) NaOH and CH₃COOH
    c) NH₄0H and HCl
    d) NOT
    HCl and NaOH
23. The smallest repulsion is observed in__pair of electrons.
    a) Bond pair-bond pair
    b) Bond pair-lone pair
    c) Lone pair-lone pair
    d) NOT
    Bond pair-bond pair
24. Structure of tri atomic molecule whose µ = 0 will be
    a) Angular
    b) Linear
    c) Complex
    d) Trigonal
    Linear
25. Type of hybridization in which s and p orbitals intermix together to form two hybrid orbitals called
    a) sp-hybridization
    b) Sp2-hybridization
    c) sp3-hybridization
    d) NOT
    sp-hybridization
26. The bond formed b/w two atoms of the same element is
    a) 100% pure covalent
    b) 50% covalent
    c) Ionic
    d) Dative
    100% pure covalent