By Sulekha Rani.R , PGT Chemistry, KV NTPC Kayamkulam
1.
A student observed that the colour of pH paper changed to green when she dipped it inwater. She added a few drops of concentrated hydrochloric acid to the water. The colour
of pH would turn to
(a) light red.
(b) apple green.
(c) dark blue.
(d) lemon yellow.
2. The colour of NO2
and PbO formed when lead nitrate is heated are :
(a) brown and green
(b) brown and yellow
(c) brown and colourless
(d) colourless and yellow
3. Bottle A contains oxalic acid and bottle B contains sodium carbonate solution. When pH
paper is dipped in each of the solutions, the colour seen in A and B respectively be
(a) orange, blue.
(b) blue, orange.
(c) green, blue.
(d) orange, green
4. Which of the following is a correct observation when water is added to lime?
(a) No change and a hissing sound
(b) Vigorous bubbling and a hissing sound
(c) Slow bubbling with no sound
(d) Vigorous bubbling with evolution of heat and a hissing sound
5. Copper sulphate solution is added to a test tube containing a clean iron nail. The correct
description regarding the deposition of copper on the iron nail would be that it starts
depositing
(a) at the tip of the nail
(b) from the head of the nail
(c) in the middle of the nail
(d) anywhere on the nail
6. . Two beakers A and B contain Iron (II) sulphate solution. In the beaker A is placed a small
piece of copper and in the beaker B is placed a small piece of zinc. It is found that a grey
deposit forms on the zinc but not on the copper. From these observations it can be
concluded.
(a) Zinc is most active metal followed by iron and copper.
(b) Zinc is most active metal followed by copper and then iron.
(c) Iron is most active metal followed by zinc and then copper.
(d) Iron is most active metal followed by copper and then zinc.
7. On heating ferrous sulphate crystals, one would get
(a) Sweet smell
(b) Rotten egg smell
(c) irritating, choking smell
(d) none of the above
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