DSSSB Junior Chemist 2015 paper

DSSSB Junior Chemist 2015 paper

__________ are called pseudo solids.
(a) Liquids
(b) Crystalline solids
(c) Amorphous solids
(d) Anisotropic solids

Example for polar molecular solid is
(a) Solid SO2
(b) Ice
(c) NaCl
(d) Iodine

When constituent particles are present only on the corner positions of a unit cell, it is called as __________unit cell.
(a) body centred
(b) face centred
(c) Primitive
(d) End centred

CaSO4 possess ___________crystal system.
(a) Cubic
(b) Tetragonal
(c) Orthorhombic
(d) Triclinic

In a BCC unit cell, total number of atoms per unit cell is
(a) 1
(b) 2
(c) 4
(d) 3

Packing efficiency in hcp and ccp structures is
(a) 52.4%
(b) 68%
(c) 45%
(d) 74%

Network solids are
(a) Soft
(b) Hard
(c) Maileable
(d) brittle

___________defect increases the density of the substance.
(a) Stoichiometric
(b) vacancy
(c) Interstitial
(d) Frenkel

__________shows both Frenkel and Schottky defect
(a) NaCl
(b) KCl
(c) AgI
(d) AgBr

Colour of Zinc oxide at room temperature
(a) White
(b) Blue
(c) Yellow
(d) Orange

Commercial bleaching solution contains __________mass percentage of sodium hypochlorite in water.
(a) 6.32
(b) 3.62
(c) 2.62
(d) 4.62

Example for ideal solution is
(a) Ethanol and acetone
(b) Chloroform and acetone
(c) Phenol and aniline
(d) Benzene and toluene