VSSC Laboratory Assistant 2015 Paper

Vikram Sarabhai Space Center Chemical Operator/ Laboratory Assistant Paper 2015

Catalyst used in Ostwald’s process for the manufacture of nitric acid
(a) Finely divided iron
(b) Platinised asbestos
(c) vanadium pentoxide
(d) alumina

Grignard reagent when reacts with water gives
(a) Alkane
(b) Alkene
(c) Alkyne
(d) Benzene

Resonance energy of benzene is
(a) -49.8 Kcal/mol
(b) -36.0 Kcal/mol
(c) +36.0 Kcal/mol
(d) -28.6 Kcal/mol

Heating of an aqueous solution of aluminium chloride to dryness will give
(a) Al(OH)Cl2
(b) Al2O3
(c) Al2Cl6
(d) AlCl3

Contact process is used for manufacturing the following
(a) HNO3
(b) HCl
(c) H2SO4
(d) HClO4

Hardness of water is due to the presence of
(a) CaCl2
(b) MgSO4
(c) Ca(HCO3)2
(d) All the above

Deionised water is prepared by the following metho
(a) Clark’s
(b) ion exchange
(c) permutit
(d) Calgon

Chemically soap is
(a) Sodium sterate
(b) Calcium stearate
(c) Magnesium stearate
(d) Ferric stearate

The reaction that takes place in atom bomb is
(a) Nuclear fusion
(b) Nuclear fission
(c) Atomization
(d) Condensation

As we move from left to right of the periodic table, the electronegativity
(a) Increases
(b) Decreases
(c) No Change
(d) Zero