A. Complete the following statement using appropriate word (s) :
1. the ________oxides true blue litmus red.
2. Metals react with acids and from salt and _________gas.
3. ___________is a reddish-brown coating formed on iron object on exposure to mosit air.
4. __________ is used for galvanising iron.
give right answer
Answers
Which of the following is not a metal?
(a) Copper (b) Sulphur (c) Aluminium (d) Iron
Answer. (b) Copper, aluminium and iron are metals but sulphur is not a metal.
Question. 2 The substance that will be flattened on beating with a hammer is
(a) crystal of iodine (b) lump of sulphur
(c) piece of coal 4 (d) zinc granule
Answer. (d) Metals can be beaten into thin sheets (or flattened) with a hammer. Non-metals break into small pieces when hammered. So, zinc granule will be flattened on beating with a hammer.
Boojho has learnt that non-metals on beating with a hammer are generally broken into pieces. Which of the following is non-metal?
(a) Iron nail (b) Aluminium wire
(c) Copper plate (d) Piece of coal
Answer. (d) Piece of coal is a non-metal which broke into small pieces when hammered.
Question. 4 Materials which can be drawn into wires are called ductile. Which of the • following is not a ductile material?
(a) Silver (b) Copper (c) Sulphur (d) Aluminium
Answer. (c) Ductility is a characteristic property of metals. Sulphur is a non-metal, so it is not
ductile. When stretched, sulphur break into pieces and do not form wires.
Answer:
1. Neutral oxides turn blue litmus to red.
2. Metals react with acids to give salt and hydrogen gas.
3. Hydrated ferric oxide is a reddish-brown coating formed on iron object on exposure to mosit air.
4. Zinc is used for galvanising iron