VSSC Chemical Operator Maintenance Mechanic 2015 Paper

Vikram Sarabhai Space Center Chemical Operator Paper 2015

Multiplication of atomic weight and specific heat (in cal/g) is
(a) 5.4
(b) 6.4
(c) 4.6
(d) 5.6

Basicity of H3PO4 is
(a) 4
(b) 1
(c) 3
(d) 7

The percentage of nitrogen in urea is about (urea=NH2CONH2)
(a) 46
(b) 85
(c) 18
(d) 28

Gas constant per molecule is known as
(a) Boltzmann constant
(b) Ideal gas constant
(c) Avogadro’s number
(d) Equivalent weight

40 degree C temperature is equal to
(a) 50 F
(b) 40 F
(c) 104 F
(d) 90 F

According to the periodic law of elements, the variation in properties of elements is related to their
(a) Nuclear masses
(b) atomic numbers
(c) neutron-proton ratio
(d) atomic masses

Two elements whose electro negativities are 1.2 and 3.0, the bond formed between them would be
(a) Ionic
(b) Covalent
(c) Coordinate
(d) Metallic

Which of the following has zero dipole moment?
(a) ClF
(b) PCl3
(c) SiF4
(d) CFCl3

Which of the following has a linear structure?
(a) CCl4
(b) SO2
(c) C2H2
(d) C2H4

The compound which contains both ionic and covalent bond is
(a) CH4
(b) H2
(c) KCN
(d) KCl

The pH of a 0.001 m NaOH will be
(a) 3
(b) 2
(c) 11
(d) 12

The oxidation number of phosphorous in Ba(H2PO2) is
(a) +3
(b) +2
(c) +1
(d) -1

The compound that can work both as an oxidizing as well as reducing agent is
(a) KMnO4
(b) H2O2
(c) Fe2(SO4)3
(d) K2Cr2O7

Reducing agent is a substance which can
(a) accept electrons
(b) accept protons
(c) donate electrons
(d) donate protons

Faradya’s laws of electrolysis are related to
(a) Atomic no of cation
(b) atomic no of anion
(c) equivalent weight of electrolyte
(d) speed of cations