UPSC Chemical Examiner Grade II Paper 2016 – Chemistry

UPSC Chemical Examiner Grade II in CRCL Paper 2016
Date of Exam – 09.12.2016

All the lanthanides generally exhibit a valency of
(a) 3
(b) 5
(c) 7
(d) 9

Which one of the following is used in thermite welding process?
(a) Mg Powder
(b) Fe Powder
(c) Al Powder
(d) Cu Powder

Borazine is known as
(a) Organic Benzene
(b) Organic Xylene
(c) Inorganic Benzene
(d) Inorganic Xylene

Which one of the following carbonates decomposes at lowest temperature?
(a) Barium Carbonate
(b) Calcium Carbonte
(c) Stransium Carbonate
(d) Magnesium Carbonate

How many lone pair and bonding pairs are present in H2O?
(a) 2 lone pairs and 2 bonding pairs
(b) 3 lone pairs and 2 bonding pairs
(c) 2 lone pairs and 3 bonding pairs
(d) 3 lone pairs and 3 bonding pairs

Which one of the following order of the dipole moments of the molecules is correct ?
(a) BF3> NH3 > NF3
(b) NF3> BF3 > NH3
(c) NH3> NF3 > BF3
(d) BF3> NF3 > NH3

Lithium is the strongest reducing agent among the alkali metals. It is due to the factor that it has high
(a) Ionization energy
(b) Electron affinity
(c) Heat of hydration
(d) Lattice energy

Who provided first the scientific concept of Acid and Base ?
(a) Sir Humphry Davy
(b) Svante Arrhenius
(c) Antoine Lavoisier
(d) Friedrich Wilhelm

Consider the following forces in molecular crystals
(1) Electrostatic force
(2) Van der Waals force
(3) Repulsive force
The molecules are maintained in their position in lattice by which of these forces ?
(a) 1 and 2 only
(b) 2 only
(c) 3 only
(d) 1, 2 and 3 only

Consider the following defects of a crystal
(1) Frenkel defect
(2) Interstitial defect
(3) Schottky defect
which of the above defects cause(s) decreases in the density of a crystal?
(a) 1 only
(b) 1 and 2 only
(c) 3 only
(d) 1, 2 and 3 only