Question

1) Give two examples of alkali metals.
2) Why is copper used in making cooking utensils and water boilers?
3) Name the metal which gives a golden Name.
4) Why is aluminium used as wrapper of medicines?
5) Why does common salt have high melting point?
6) How would you say that ZnO is amphoteric in nature?
7) What do you mean by metallic character?
8) Why is tungsten used in desigiling of filament of electric bulb?
9) What happens when copper powder is added in silver nitrate solution?
10) Name two metals which are placed at the top of reactivity series.
11)Why aluminium articles do not require polishing and painting?
12)How does sodium hydroxide react with aluminium?
13) Give reason for the following:
(a) School bells are made up of metals.
(b) Electric wires are made up of copper.
14) A metal 'X'acquires a green colour coating on its surface on exposure to air.
(i) Identify the metal X’and name the process responsible for this change.
(ii)Name and write chemical formula of the green coating formed on the metal.
(iii) List two important methods to prevent the
15) 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.
16) Why does calcium float in water?
17) Name a non-metal which is lustrous and a metal which is non-lustrous.
18) Which gas is liberated when a metal reacts with an acid? How will you test
the presence of this gas?
19) Name the metal which reacts with a very dilute HNO3 to evolve hydrogen gas.
20) Name two metals which are found in nature in the free state.
21) Arrange the following metals in the decreasing order of reactivity: Na, K, Cu,Ag.
22) Give reasons for the following observation:
(1) lonic compounds in general have high melting and boiling points.
them with carbon.
23) Why metals have high densities?
24) Name a metal which exists as a liquid at room temperature.
25) Give reason, Why Sodium, potassium and lithium are stored under oil?




please ans fast​

Answer 1

Answer:

blimey ! 25 answers ?!?!?!

u must give more points for this

huh..

Answer 2

Answer:

1) (i) Sodium Hydroxide, NaOh

(ii) Potassium Hydroxide, KOH

May it help you