1. The unit cell of aluminium is a cube with edge length of 405 pm. The density of aluminium is 2.7 gm/ cm-3. What is the type of
unit cell of aluminiumcrystals.
1. Body centered cubic
2. Face centered cubic
3. Hexagonal
4. Simple cubic
2. Assertion (A): Glass melts over a range of temperature
Reason (R): Glass has long range order.
1. A and R are true and R is the correct explanation of A
2. A and R are true and R is not the correct explanation of A
3. A is true, R is false
4. A is false, R is true
3. The general formula of ferrites is MFe 2O4. Where ‘M’ would not be
1. Mg 2. Cu 3. Zn 4. Al
4. Out of seven crystal systems how many have face centered space lattices
1. 1 2. 2 3. 3 4. 4
5. Correct statements about Bakelite
1. It is a thermoplastic polymer
2. It is used in making gears
3. It is a polymer of ‘X’ and ‘Y’ monomers with ‘CHO’ and ‘on’ functional groups. ‘CHO’, ‘OH’
4. The formation of this polymer involves removal of ‘NH3’ molecule
a. 1, 2 b. 2, 3 c. 2, 4 d. 3, 4
6. Homopolymer among the following
1. PTFE 2. PET 3. Buna-N 4. SBR
7. In the formation of 1, 4 link in the natural rubber, residual double bonds are arranged between
1. C1, C2 2. C2, C3 3. C3, C4 4. C1, C4
8. A: ‘PGA’ is used in post-operative stitches
R: The functional group in the monomer of PGA is COOH
1. Both A and R are corret and R is correct explanation of A
2. Both A and R are correct and R is not correct explanation of A
3. A is true, R is false
4. R is true, A is false
9. Incorrect Statement is
1. Free rotation of peptide bond is possible in polypeptide chain
2. dextrin is formed from D-glucose molecules
3. β – structural protein has all the peptide chains, compleltely stretched and then put together along side one another
4. amylum contains amylopectin
10. A polymer ‘X’ is used to prepare ‘TV’ cabinets- Its monomer is
1. Bengene 2. Ethelene 3. both 4. 2-chloro 1-3 Butadine
11. In the graph to determine average – number molecular weight, the ‘x’ refers to
1. C/ π 2. π/ T 3. (π/ C) π/ C 4. (C/ π)
12. The reaction, CH3-(+) C4RB (-) + CH2 = CH-R → of Cationic polymerisation belongs to
1. Initiation step
2. Propagation step
3. Termination step
4. doesn’t belong to any step
13. The correct statement is
1. In frenkel defect, density of crystal increases
2. In schottky defect, density of crystal increases
3. In schottky defect, density of crystal decreases
4. In frenkel defect, density of crystal decreases
14. Polyvinyl pyrodidone is used in the preparation on of
1. Safety belts 2. Lubricants 3. basic dye 4. cheap plastic
15. The first order diffraction of X-rays from a certain set of crystal plates occurs at an angle of 11.8ο from the planes. If the planes are 0.281 nm apart. The wavelength of xrays is– (sin11.8 = 0.2044)
1. 1.1149 2. 1.782 3. 0.1149 4. 3.476
16. The number of atoms contained within cubic cells, a body centered and face centred cubic cells respectively
1) 3, 6, 9 2) 1, 4, 2 3) 1, 8, 4 4) 1, 2, 4
17. In a compound AB, the ionic radii of A+ and B- are 88 PM and 200 PM respectively. The co-ordination number of A+ and Crystal structgure resp. are.
1. 3, triangular planar
2. 4, tetrahedral
3. 4, square planar
4. 6, octahedral
18. A solid contains A and B atoms. Atoms ‘A’ are arranged in ‘ccp array’. Atom ‘B’ occupy all octahedral voids and half of the tetrahdral voids- The formula of compound is
1. AB2 2. A2B 3. AB3 4. A2B3
KEY : 1)2 2)3 3)4 4)2 5)2 6)1 7)2 8)2 9)1 10)3 11)3 12)2 13)3 14)3 15)3 16)4 17)3 18)1.
Hints
1) d = ZM/ Noa3, when ‘Z’ is ‘4’, the structure is FCC
2) Glass is an amorphous substance.
3) ‘M’ should be divalent.
4) ‘FCC’ contains lattice points at face centers and corners of the cube.
5) Bekellite is a co-polymer of HCHO & C6H5OH
5) Homo-polymer must contain similar monomers.
7) Isoprene units contains two double bonds b/w 1&2, 3&4 ‘C’ atoms before 1,4 link formation.
8) PGA is poly-glycolic acid and there is no relation between presence of particular functional group and its application is daily life.
9) The regional planarity about each peptide bond, which limits the possible conformations of the peptide chain.
10) Monomer is styrene with composition of CH2=CHC6H6
11) When π/C plotted against ‘C’ a straight line plot is obtained which was extra plotted to zero concentration.
12) In propagation chain, chain is elongated.
13) In schootky defect atoms/ ions are completely removed from crystal.
14) PVP is used to deepen the colour of the dye
15) As per Braggs equation, 2dsinθ = nλ 16) Nature of unit cell Location of Lattice points Cubic cell ‘8’ corners BCC ‘8’ corners + 1, Body center FCC ‘8’ corners + 6, Face centers
17) rc/ra = 88/200 = 0.44, which indicates coordinater number of 4
18) ‘N’ atoms produce ‘N’ octahedral holes and ‘2N’ tetrahedral holes.