When the substances Si, KCl, CH3OH and C2H6 are arranged in order of increasing melting point , what is the correct order?

(a) Si, KCl ,CH3OH ,C2H6

(b) CH3OHC2H6, Si ,KCl 

(c) KCl, Si, C2H6CH3OH

(d) C2H6, CH3OH , KCl , Si

Concept Questions :-

Lattice/Hydration Energy
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Iodine molecules are held in the solid lattice by............

(a) London forces                     (b) dipole-dipole interactions

(c) Covalent bonds                   (d) coulombic force

Concept Questions :-

Vanderwaal Force
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Which substance has the highest melting point ? 

(a) CO

(b) CO2

(d) SiO2

(d) P2O5

Concept Questions :-

Lattice/Hydration Energy
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Nodal planes of π-bond(s) in CH2=C=C=CH2 are located in:

(a) all are in molecular plane

(b) two in a molecular plane and in a plane peerpendicular to moleclar plane which contains C-C σ-bond

(c) one in molecular plane and two in plane perpendicular to molecular plane which bisects C-C σ-bonds

(d) two in a molecular plane and one in a plane perpendicular to molecular plane which bisects C-C σ-bonds at right angle.

Concept Questions :-

Hybridisation
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The hybridisation of the  central  atom will change when: 

(a) NH3 combines with H+

(b) H3BO3combines with OH-

(c) NH3 forms NH2-

(d) H2O combines with H+

Concept Questions :-

Hybridisation
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Spacies having maximum 'CIO' bond order is:

aCIO-3                      bCIO3          cCIO2                        d CIO-2

Concept Questions :-

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Which of the following have X-O-X linkage?

(where X is Central atom)

(i) Cr2O72-                            (ii) S2O32-                       

(iii) Pyrosilicate                     (iv) Hyponitrous Acid

(a) (i) (iii)                                             (b) (iii) (iv)

(c) (i) (iii) (iv)                                       (d) (i) (ii)

Concept Questions :-

Types of Bonding
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Which bonds are formed by a carbon atom with sp2 - hybridisation?

(a) 4π - bonds

(b) 2π - bonds and 2σ bonds

(c) 1π-bonds and 3σ-bonds

(d) 4δ - bonds

Concept Questions :-

Hybridisation
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Which of the following species contains maximum number of atoms in 'XY' plane?

  1. XeF2         2. SF63. IF3           4. All

Concept Questions :-

Hybridisation
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What are the hybridisation of the carbon atoms labelled C1 and C2 respectively in glycein?

                C1             C2

          (a) sp2         (a) sp2

          (b) sp2         (b) sp3

          (c) sp3          (c) sp2

          (d) sp          (d) sp3

Concept Questions :-

Hybridisation
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