1. . The elements of VII A of modern periodic table are called:
(A) Chalcogenides
(B) Halogens
(C) Alkali metals
(D) Carbon family
2. . The word ______ is made from Greek words “halos” and “genn”:
(A) Alkali metals
(B) Chalcogenides
(C) Halogens
(D) Carbon family
3. . ______ means the salt former or salt givers:
(A) Chalcogenides
(B) Halogens
(C) Alkali metals
(D) Carbon family
4. . In the following, the elements have 7 electrons in their outermost shell:
(A) Halogens
(B) All of these
(C) Bromine
(D) Chlorine
5. . In the following groups all elements have a strong irritating smell:
(A) Alkali metals
(B) Chalcogenides
(C) Halogens
(D) Carbon family
6. . In laboratory, which one of the following is produced by the reaction of hydrochloric acid with concentrated sulphuric acid:
(A) Nucleus
(B) Electron
(C) Proton
(D) Neutron
7. . During production of chlorine from brine, the electrolysis cell used is:
(A) Dry Cell
(B) None
(C) Down’s Cell
(D) Nelson Cell
8. . Rays that are more powerful than X-rays are:
(A) Alpha
(B) Beta
(C) None
(D) Gamma
9. . During the production of chlorine by electrolysis of brine, the other product besides chlorine is:
(A) NaOH + CO₂
(B) NaOH + H₂
(C) NaOH + H₂O
(D) Na + H₂O
10. . Chlorine gas is heavier than air:
(A) 2.5%
(B) 4.5%
(C) 3.5%
(D) 5.5%
11. . Chlorine on reaction with caustic soda produces salt, water, and:
(A) NaClO
(B) KClO₂
(C) NaClO₂
(D) NaClO₂
12. . Chlorine on reaction with carbon monoxide produces a toxic gas:
(A) Acetylene
(B) Phosphene
(C) All
(D) Phosgene
13. . The chlorine chain reactions occur in the presence of:
(A) Diffused sunlight
(B) High pressure
(C) High temperature
(D) All
14. . The brown colored halogen gas is:
(A) Halogens
(B) Chlorine
(C) Bromine
(D) Iodine
15. . ______ is used in the production of cloth and medicine:
(A) Halogens
(B) Bromine
(C) Chlorine
(D) Iodine
16. . Which one of the following gases is used to remove germs from water?
(A) Chlorine
(B) Halogens
(C) Bromine
(D) Iodine
17. . Which one is used for the production of Aqua Regia:
(A) HCl
(B) HBr
(C) HI
(D) HF
18. . Which one of the following will produce white fumes with moist air:
(A) HF
(B) HBr
(C) HI
(D) HCl
19. . An element different from the other elements in the following:
(A) Fluorine
(B) Iodine
(C) Astatine
(D) Chlorine
20. . Which element in the following is isotopic:
(A) Iodine
(B) Astatine
(C) Fluorine
(D) Chlorine