Vikram Sarabhai Space Center Chemical Operator Paper 2015
The gas constant R represents work done
(a) Per molecule
(b) per dgree absolute
(c) per degree per mole
(d) per mole
The number of singma bonds in C2H4 (ethelene) molecule is
(a) 2
(b) 3
(c) 4
(d) 5
How many electrons are present in the M-shell of the atom of an element with atomic number 24?
(a) 5
(b) 6
(c) 12
(d) 13
Catalyst used in ostwald’s process for the manufacture of nitric acid
(a) Finely divided iron
(b) platinised asbestos
(c) vanadium pentoxide
(d) alumina
Ozone depletion in the startosphere is mainly caused by
(a) SO2
(b) NO2
(c) NO
(d) Chlorofluorocarbons
Pollutants released from iron and steel industry are
(a) CO2, NO2, H2S
(b) CO, CO2, SO2
(c) CO2, SO3, NO2
(d) CO2, NO, SO3
Main Pollutant from automobile exhaust is
(a) Co
(b) CO2
(c) NO
(d) NH3
Fish die in water bodies polluted by sewage due to
(a) Phathogens
(b) reduction in oxygen
(c) Foul smell
(d) change in state
Which of the following is not greehouse gas?
(a) Methane
(b) Carbon dioxide
(c) CFCS
(d) CH3Br vapour
What is the pH of natural rain water
(a) 5.64
(b) 5.70
(c) 7.00
(d) 7.40
One of the following is not a representative element
(a) Na
(b) Mg
(c) Al
(d) Cu
The number of nodal planes ‘d’ orbital has
(a) 1
(b) 2
(c) 3
(d) zero
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