Q. The gas used for inflating the tyres of aeroplanes is -
1) hydrogen
2) helium
3) nitrogen
4) neon
Q. 'Red ink' is prepared from -
1) phenol
2) aniline
3) congo Red
4) eosin
Q. The compound associated with Bhopal Gas Tragedy was -
1) Methyl alcohol
2) Phosphazene
3) Methyl isocyanate
4) Methylamine
Q. The chemical used as fixer in the photography is -
1) sodium thiosulphate
2) borax
3) sodium tetrathionate
4) Ammonium molybdate
Q. Percentagewise which gas is the most abundant in the atmosphere?
1) Nitrogen
2) Oxygen
3) Hydrogen
4) Carbon dioxide
Q. Which one of the following salts should not be used as dining table salt?
1) Iodized salt
2) Sea salt
3) Rock salt
4) Processed common salt
Q. Which gas is released when water is added to bleaching powder?
1) Chlorine
2) Hydrogen
3) Oxygen
4) Carbon dioxide
Q. The number of neutrons in an atom is equal to the :
1) Number of electrons
2) Mass number
3) Mass number - Atomic number
4) Atomic number
Q. How many atoms are present in a (NH4)2SO4 molecule?
1) 15
2) 13
3) 14
4) 12
Q. In Mendeleev's periodic table, the properties of the elements are considered a periodic function of their :
1) Atomic number
2) Atomic mass
3) Atomic size
4) Ionization enthalpy
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