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Assertion Reason for solid state
2011-04-07 12:16:53
1.         Statement 1 : Crystalline solids are anisotropic.
            Statement 2 : Crystalline solids are not as closely packed as amorphous solids.
Ans.     c
2.         Statement 1 : Space or crystal lattice differ in symmetry of the arrangement of points.
            Statement 2 : nl = 2dsinq, is known as Bragg’s equation.
Ans.     b
3.         Statement 1 : In crystal lattice, the size of the cation is larger in a tetrahedral hole than in an octahedral hole.
            Statement 2 : The cations occupy more space than atoms in crystal packing.
Ans.     d
4.         Statement 1 : In NaCl crystal each Na+ ion is touching 6Cl- ions but the Cl- ions do not touch each other.
            Statement 2 : The radius ration rNa +/rCl- is greater than 0.414 required for exact fitting.
Ans.     b
5.         Statement 1 : In close packing of spheres, a tetrahedral void is surrounded by four spheres whereas an octahedral void is surrounded by six spheres.
            Statement 2 : A tetrahedral void has a tetrahedral shape whereas an octahedral void has an octahedral shape.
Ans.     c
6.         Statement 1 : Solid NaCl does not conduct electricity at all.
            Statement 2 : There are no defects/holes present in NaCl crystal.
Ans.     d
7.         Statement 1 : Ionic solids are characterized by high melting and boiling point.
            Statement 2 : They are made up of cations and anions.
Ans.     e
8.         Statement 1 : Ionic solids are characterized by high melting and boiling point.
            Statement 2 : Ionic solids have coulombic forces of attraction between their ions.
Ans.     a
9.         Statement 1 : Molecular solids are characterized by low melting point.
            Statement 2 : Molecular solids are made up of covalent molecules.
Ans.     b
10.       Statement 1 : Amorpnous substances are isotropic.
            Statement 2 : Properties like refractive index, electrical conductance have different values in different direction for isotropic substances.
Ans.     c

 

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