Chemistry | MHT-CET | 2021 |update | Top 50 Questions |

 Multiple choice questions.📌

1] Fused silica exist in the form of _______

  a) crystalline solid    b) liquid

  c) amorphous solid  d) gel

2] The solid is said to be amorphous if 

a) there is only a long range order of its constituent particles.

b) there is only a short rang order of its constituent particles.

c) there is a long range and a short range order of its constituent particles.

d) there is a long range repeated order of its constituent particles.

3] Which of the following is a molecular crystal ?

a) Dry ice     b) Diamond

c) Rock salt  d) Quartz

4] Amorphous solids are ______

a) true solids      b) supercooled liquids

c) supercooled solids  d) true liquids

5] KCl and SO2 are ______

a) ionic solid and polar molecular solid respectively.

b) ionic solid and non-polar molecular solid respectively.

c)  ionic solid and covalent solid respectively.

d) covalent solid and non-polar molecular solid respectively.

6] pyrex glass is obtained by fusing

a) SiO2 and Na2O

b) SiO2, B2O3 and Al2O3.

c) SiO2, MgCO3 and CaCO3.

d) SiO2, MgO and CuO.

7] if refractive index if found to be same in all direction through a solid, then this property is called ___

a) isomerism

b) metamerism

c) isotropy

d) anisotropy.

8] Ionic solids are generally

a) good conductor of generally

b) soft

c) volatile

d) quite brittle

9) The force that holds kernels together in the crystal is called _____

a) ionic bond 

b) hydrogen bond

c) covalent bond

d) metallic bond

10) The smallest portion of a space lattice which can generate the crystal by repeating its dimensions is _____.

a)cell

b) unit cell

c) unit lattice 

d) space lattice

11) The relations a ≠ b ≠ c and α  = γ = 90° and β ≠ 90𝆩 belong to the crystal system

a) triclinic

b) monoclinic

c) rhombic 

d) cubic

12) The unit cell with the crystallographic dimension a=b ≠c, α=β= 90°, γ = 120° is

a) rhombic  b) trigonal  c)  tetragonal   d)  hexagonal

13) The ratio of close packed atoms to tetrahedral holes in cubic packing is

a) 1:1     b) 1:2   c) 2:1    d) 1:3

14) The number of atoms in a single body centred cubic unit cell is ____

a) 1    b)2   c)4    d) 8

15] In the closest packing of atoms,

a) the size of tetrahedral void is greater than that of octahedral void

b) the size of tetrahedral void is equal to that of octahedral void

c) the size of tetrahedral void is small than that of octahedral void

d) the size of tetrahedral void is greater than that of octahedral void

16] The number of tetrahedral sites per sphere in ccp structure is 

a) 4   b)3    c)2    d) 1

17] In the closest packing of atoms, there are 

a) one tetrahedral void and two octahedral voids per atom

b) two  tetrahedral void and two octahedral voids per atom

c) two of each tetrahedral void and octahedral voids per atom

d) one of each tetrahedral void and octahedral voids per atom

18] The fraction of volume occupied by atoms in face-centred cubic unit cell is

a)0.48    b)0.53     c) 0.68      d) 0.74

19] How many 'nearest' and 'next nearest' neighbours respectively potassium has in bcc lattice ?

a) 8,8   b) 8,6   c) 6,8   d) 6,6

20] which arrangement of electrons describes ferro-magnetism ?

a) ↑↑↑↑↑    b)↑↓↑↓      c)↑↑↑↓↓      d)↓↓↑↑

21] Copper crystallizes in a face-centred cubic lattice with a unit cell length of 361 pm. What is the radius of copper atom in pm ?

a) 157      b)181    c)108     d) 128

22]  In crystalline solid few of the cations moved from their positions into the interstitial position.

the defect is called 

a) Interstitial defect     b) Frenkel defect

c) Schottky defect       d) Line defect

23] One gram of magnesium contains approximately _____ valence shells.

a) 3   b) 10^3    c) 10^30    d) 10^22

24] The unbalance spin of electron exhibit

a) magnetism    b) spectra     c) visible colours    d) allotropy

25] Which of the following is very soft solid ?

a) metallic   b)covalent   c)molecular  d) ionic 

26] Schottky defect is possible in 

a) CsCl    b) NaCl      C)Al2O3     d) both (a) and (b)

27] Copper crystallizes in fcc with a unit cell length of 361 pm. What is the radius of copper atom ?

a) 108 pm   b) 127pm   c) 157 pm   d) 181 pm

28] The edge length of a face centered cubic cell of an ionic substance is 508 pm . if the radius of the cation is 110 pm, the radius of the anion is 

a) 228 pm   b) 398 pm    c) 618 pm   d) 144 pm

29] Lithium forms body centered cubic structure. The length  of the side of its unit cell is 351 pm. Atomic radius of the lithium will be 

a) 75 pm   b) 300 pm   c) 240 pm    d) 152 pm

30) The co-ordination number of a metal crystallizing in a hexagonal close-packed structure is 

a) 12     b) 4    c) 8      d) 6

31] Diamagnetism is exhibited by

a) Cobalt   b) water   c) Oxygen   d) Iron

32] Which of the following is paramagnetic substance ?

a) Oxygen    b) Sodium chloride    c) Cobalt     d) Nickel

33] which of the following is ferromagnetic substance ?

a) water   b) NaCl    c) Benzene     d) CrO2

34] The property of a substance due to presence of unpaired electrons is called 

a) paramagnetism   b) diamagnetism 

c) polymerisation   d) polymorphosis

35] n-type semiconductor 

a) have no change

b) have extra negative change

c) have extra positive change

d) are neutral type of semiconductor 

36] Polar molecular solid

a) are good conductor of electricity

b) are poor conductor of electricity

c) do not conduct electricity

d) are semiconductor of electricity

37] Semi conductors are manufactured by addition of impurities of 

a) s-block element 

b) actinoids

c) lanthanoids

d) p-block elements

38] Due to frenkel defect the density of ionic solid

a) increases   b) decreases    c) remains same   d) fluctuates

39] The crystal with metal deficiency defect is 

a) NaCl    b) FeO    c) KCl     d) ZnO

40] Which of the following compound shows both frenkel and Schottkly  defects ?

a) AgI    b) NaCl   C) AgCl    d) KCl

41] ％ of free space in cubic close packed structure and in body centered packed structure are resp.

a) 32% and 48%      b) 48% and 26%

c) 30% and 26%       d) 26% and 32%

42] CuSO4 . 5H20 belongs to 

a) triclinic system      b) cubic system

c) tetragonal system  d) hexagonal system

43] _____ is antiferromagnetic in nature.

a) VO2     b) CrO2      c) TiO2       d) MnO2

44] Which of the following in NOT ferromagnetic ?

a) Nickel     b) Manganese    c)Cobalt      d) Iron 

45] For which crystal anion-anion contract is valid ?

a) NaF    b) NaI     c) CsBr     d) KCl

46] Edge length of a cube is 400 pm, its body diagonal would be 

a) 500 pm    b) 600 pm   c) 566 pm    d) 693 pm

47] Which of the following has no rotation of symmetry ?

a) hexagonal        b) Orthorhombic

c) Cubic                d) Triclinic

48] The fraction of volume occupied by atoms in body-centered cubic unit cell is 

a) 0.32     b) 0.48      c) 0.68      d) 0.74

 49 ] An example of a face centered cubic lattice is 

a) Zinc     b) Sodium    c) Copper     d) Cesium chloride

50] The number of octahedral sites per sphere in fcc structure 

a) 2     b)1     c) 4      d) 3

ans:-

1. c |  2. b |  3. a | 4. b | 5. a | 6 . b | 7 . c | 8 . d | 9 . d | 10 . b | 11 . b | 12 . d | 13 . b | 14 . c | 15 . c | 16 . c | 17 . b | 18 . d | 19 . b | 20 . c | 21 . d | 22 . a | 23 . d | 24 . a | 25 . c | 26 . d | 27 . b | 28 . d | 29 . d | 30 . a| 31 . b | 32 . a | 33 . d | 34 . a | 35 . b | 36 . c | 37 . d | 38 . c | 39 . b |40 . a | 41 . d | 42 . a | 43 . b | 44 . b | 45 . b | 46 . d | 47 . d | 48 . d | 49 . c | 50 . b |