Question

1.Name one non-metal and one metal, which are in liquid state at room temperature.
2.Identify the following oxides with neutral, acidic, basic and amphoteric oxides.
i) Al2O3 ii) MgO iii) SO2 iv) CO; v) Na2O vi) N2O vii) ZnO viii) CO2 ix) SO3 x) CaO.
3.Write the name of the compound, when iron is corroded?
4.i) Among iron and aluminium which rusts easily?
ii) What are the conditions, necessary for rusting of iron?
5.Select the non-metals amongst the following
i) Bismuth ii) Sulphur iii) Arsenic iv) Hydrogen
6.Name a metal which is stored in kerosene oil.
7.Why is sodium kept in kerosene?
8.Write chemical equations that shows aluminium oxide reacts with acid as well as base.
9.Write one example of each of
(i) a metal which is so soft that, it can be cut with knife and a non-metal which is the hardest sustance.
(ii) a metal and a non-metal which exist as liquid at room temperature.
10.You are given samples of three metals. Sodium, magnesium and copper. Suggest any two activities to arrange them in order of decreasing activity.
11.You are provided with magnesium ribbon and sulpher powder. Explain with the help of an activity that metal oxides are basic and non-metal oxide are acidic in nature.
12.Give reason for the following:
(a) School bells are made up of metals.
(b) Electric wires are made up of copper.
13.Name the following:
(a) A metal, which is preserved in kerosene.
(b) A lustrous coloured non-metal.
(c) A metal, which can melt while kept on palm.
(d) A metal, which is a poor conductor of heat.
14.Explain why calcium metal after reacting with water starts floating on its * surface. Write the chemical equation for the reaction. Name one more metal
that starts floating after some time when immersed in water.
15.Write balanced equations for the reaction of:
(i) aluminium when heated in air. Write the name of the product.
(ii) iron with steam. Name the product obtained.
(iii) calcium with water. Why does calcium start floating in water?
16.Write balanced chemical equations for the following reactions:
(a) Dilute sulphuric acid reacts with aluminium powder.
(b) Dilute hydrochloric acid reacts with sodium carbonate.
(c) Carbon dioxide is passed through lime
17.What are amphoteric oxides? Choose the amphoteric oxides from amongst the following oxides:
Na2O, ZnO, Al2O3, CO2, H2O
18.A metal (E) is stored under kerosene. When a small piece of it is left open in the air, it catches fire. When the product formed is dissolved in water, it turns red litmus to blue.
(i) Name the metal (E).
(ii)Write the chemical equation for the reaction when it is exposed to air and when the product is dissolved in water.
19.A non-metal X exists in two different forms Y and Z. Y is the hardest natural substance, whereas Z is a good conductor of electricity. Identify X, Y and Z.
20.Arrange the following metals in the decreasing order of reactivity: Na, K, Cu, Ag.

*Solve all the questions*​

Answer 1

Answer:

1.Non metal is bromine(Br) and metal is Mercury(Hg)

3. rust or hydrated iron oxide.

4 (i) iron

(ii)moisture

5 sulphur, hydrogen

6.sodium metal (Na) is stored in kerosene

7. sodium is stored in kerosene because it is highly reactive.

9.(i) sodium(Na) , a metal that is soft and diamond is the hardest non metal.

(ii) mercury(Hg) is the metal and bromine(Br) is tge nom metal liquid at room temperature.

12(a) metals are sonorous that is they produce a ringing sound when struck by a hard substance.

(b)electric wires are made if copper because copper is a metal and has many free electrons which enable the transfer of electricity.

13 (a) Sodium

(b) Iodiene

(c)gallium(Ga)

(d)mercury (Hg)