Question

one mark :
1.Name a non metal which is lustrous and
a metal which is non lustrous.
2. Name and write symbol of a metal that exists in
liquid State at noom temperature
3. Write 2 metals that will melt at room temperature?
4 Why does calcium float in water ?
5. which gas is liberated when a metal reats with
an acid ? How will you test the presence of this gas?
6. Name the metal which reacts with a very dilute
Hno3 to evolve hydrogen gas.
7. Arrange the following metals in the decreasing
order of reactivity : Na, K, Cu, Ag.​

Answer 1

1. lustrous :gold non lustrous :mercury

2. mercury (Hg)

3. mercury melts at room temperature . gallium melts at temperature above room temperature .

4.bcoz it's density is less than water.

Answer 2

Answer:

1. Non metal - Iodine

Metal - Iron

2. Mercury is the metal that exists in liquid state at room temperature.  

Chemical symbol - Hg

3. Caesium and Gallium metals have very low melting point.

4. (Sorry, I didnt get what was the question. Ask it again or I will try later to answer it)

5. Hydrogen gas. You can see the presence of the gas by doing

Metal + acid reaction. K and Na are some powerful acids which catch fire while hydrogen gas evolved.

6. Magnesium reacts with nitric acid.

7. K > Na > Cu > Ag

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Thanks!!