P – BLOCK ELEMENTS – 29

1) Iodine is formed when KI reacts with a solution of
a) Zn SO4

b) Cu SO4

c) Fe SO4

d) (NH4)2 SO4

2) Bromine gas turns starch iodide paper
a) Blue
b) Red
c) Colourless
d) Yellow

3) The melting point of Astatine is
a) 572 K
b) 472 K
c) 372 K
d) None of the above

4) Mustard gas is
a) (C2H4 Cl)2 S

b) C2H4 Cl2

c) C2H4 S

d) C2H4 S

5) An example of a pseudo halogen is
a) Cyanogen
b) Solenocyanogen
c) both cyanogen and solenocyanogen
d) None of the above

6) The halogen acid which is a syrupy liquid at room temperature is
a) Hl
b) HBr
c) HCl
d) HF

7) The halogen which is only obtained by anodic oxidation is
a) Fluorine
b) Chlorine
c) Bromine
d) All of these

8) The noble gas having an ionisation potential close to that of oxygen is
a) Xenon
b) Radon
c) Neon
d) Argon

9) The principal ore of tin is
a) Cassiterite
b) Chalopalite
c) Frankilite
d) White tin

10) Duralium contains about
a)  95 % Al

b) 40 % Al

c) 60 % Al

d) 5 % Al

11) At high temperature nitrogen combines with CaC2 to give
a) Calcium cyanide
b) Calcium cyanamide
c) Calcium carbonate
d) Calcium nitrade

12) Nitrosonium is a/an
a) Ligand
b) Arrhenius acid
c) Ligand and Arrhenius acid
d) Bronsted acid

13) The maximum no.of moles of oxygen required to completely react with 1 mole of sulphur to give SO2 is
a) 2
b) 4
c) 8
d) 16

14) Which of the following represents the correct structure of phosphoric acid?
a) (H-O)3 P–> O
b) H2 O2 PO2
c) (HO)4 P
d) (OH)3 P-O


Answer

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