Q. Which one of the following is not a pigment?
1) Zinc oxide
2) Chalk
3) White lead
4) Silica
Q. Which one of the following is the colour of hydrogen gas?
1) Light yellow
2) Orange
3) Black
4) Colourless
Q. Which one of the following allotropes of carbon is isomorphous with crystalline silicon?
1) Coke
2) Diamond
3) Graphite
4) Coal
Q. Which one of the following is not an example of a redox reaction?
1) AlCl3+3H2O → Al(OH)3+ 3HCl
2) 2NaH → 2NA + H2
3) 4Fe + 3O2 → 2Fe2O3
4) CuSO4 + Zn → Cu + ZnSO4
Q. For an element with atomic number 35, which one of the following will be the correct number of electrons in its valence shell based on Bohr's model of an atom?
1) 1
2) 3
3) 5
4) 7
Q. Which one of the following is the correct order of the valencies of elements Ne, Si, N, and Mg?
1) Ne
Q. The mass number of argon is 40. Which one of the following statements is correct?
1) The number of protons in argon is 22
2) The number of neutrons in argon is 18
3) The number of electrons in argon is 18
4) The sum of the numbers of protons and electrons in argon is 40
Q. Which one of the following is a covalent compound?
1) Calcium oxide
2) Sodium nitride
3) Silicon carbide
4) Zinc sulphide
Q. Which one of the following is the correct molecular formula of ammonium carbonate if the valency of the ammonium ion is (+1) and the carbonate anion is (-2)?
1) (NH4)2 CO3
2) NH4 (CO3)2
3) (NH3)2 CO3
4) NH4 CO3
Q. Cl- is not isoelectronic with -
1) K+
2) Mg2+
3) S2-
4) p3-
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