Which one of the following is a reduction reaction?
2 Mg(s) + O2(g) → 2 MgO(s)
S(s) + O2(g) → SO2(g)
2 HgO(s) 2Hg(l) + O2(g)
Mg(s) + S(s) → MgS(s)
Which one of the following oxides of nitrogen is known as 'anhydride' of nitric acid?
N2O
N2O3
NO3
N2O5
Which one of the following is the chemical name for baking soda?
Sodium bicarbonate (Sodium hydrogen carbonate)
Sodium carbonate
Potassium bicarbonate (Potassium hydrogen carbonate)
Potassium carbonate
Which one of the following is water gas?
Mixture of carbon monoxide and hydrogen
Mixture of carbon monoxide and nitrogen
Mixture of carbon dioxide and water vapour
Mixture of carbon monoxide and water vapour
Suppose you have four test tubes labelled as 'A', 'B, 'C' and 'D'. 'A' contains plain water, 'B' contains solution of an alkali, 'C' contains solution of an acid, and 'D' contains solution of sodium chloride. Which one of these solutions will turn phenolphthalein solution pink?
Solution 'A'
Solution 'B'
Solution 'C'
Solution 'D'
Which one of the following carbon compounds will not give a sooty flame?
Benzene
Hexane
Naphthalene
Anthracene
What is the number of mole(s) of H2(g) required to saturate one, mole benzene?
1
2
3
4
C.
3
Which one of the following statements is correct?
Covalent bonds are directional
Ionic bonds are directional
Both covalent and ionic bonds are directional
Both covalent and ionic bonds are non-directional