Question

C.
a.
Metals and Non-metals
D. Tick (V) the correct answer.
1. Which of the following elements will you be able to cut with knife?
a. Copper
b. Calcium
Sodium
d. Silicon
2. This non-metal is found in solid state at room temperature.
Fluorine
b. Chlorine
c. Bromine
d. Iodine
3. Which of the following statements about graphite are correct?
i. It is a good conductor.
ii. It is used in pencil leads.
iii. It is ductile.
iv. It is made of carbon.
i and ü
b. i, ii and iv
c. i and iv
d. i, ii and iii
4. An acidic oxide will be formed by:
Na
b. P
c. K
a.
a.
d. Mg
5. Which of the following metals will displace iron from its salt solution?
Zinc
b. Lead
c. Copper
d. Gold
a.
Short-Answer Questions
nswer the following in few words.​

Answer 1

1.Sodium

2.Bromine

3.i,ii,vi

$HOPE \: IT \: HELPS \: U!!$

Answer 2

★ Required Answer ★

D. Tick (☑) the correct answer.

1. Which of the following elements will you be able to cut with knife?

a. Copper

b. Calcium

c. Sodium ☑

d. Silicon

$\implies$ Since sodium is a soft metal, so it can be easily cut with knife.

_________

2. This non-metal is found in solid state at room temperature.

a.Fluorine

b. Chlorine

c. Bromine

d. Iodine☑

$\implies$ Iodine is a non-metal found in solid state at room temperature. Fluorine, chlorine, bromine are all non-metals but fluorine and chlorine are non-metals that found in gaseous state at room temperature and bromine is a non-metal found in liquid state at room temperature.

_________

3. Which of the following statements about graphite are correct?

i. It is a good conductor.

ii. It is used in pencil leads.

iii. It is ductile.

iv. It is made of carbon.

a.i and ii

b. i, ii and iv ☑

c. i and iv

d. i, ii and iii

________

4. An acidic oxide will be formed by:

a Na

b. P☑

c. K

d. Mg

$\implies$ We know that acidic oxide forms when a non metal reacts with oxygen. So just we have to find a non metal in the given options. Here, Na(Sodium), K(Potassium) and Mg(Magnesium) are metals, thus they are incorrect and the correct option is P(Phosphorus) ☑.

5. Which of the following metals will displace iron from its salt solution?

a. Zinc ☑

b. Lead

c. Copper

d. Gold

$\implies$ In the reactivity series, lead, copper and gold come after iron, thus they are less reactive than iron and can't displace it. Zinc is more reactive than iron and can displace easily by displacement reaction.

[ ★ Displacement reaction : This is the reaction in which more reactive metal displaces a less reactive metal and forms its salt solution. ]

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★ More Information ★

What are metals?

Metals are those substances that gain positive charge by losing electrons. Ex-Mercury, gold etc. They are malleable, ductile, sonorous, hard etc.

What are non-metals?

Non-metals are those substances that gain negative charge by gaining electrons. Ex-chlorine, phosphorus. They are non-malleable, non-ductile, non-sonorous and so on.

Some uses of metals and non-metals:

Metals:

→As metals are good conductors of electricity like copper, they are used to make wires.

→ As metals are good conductors of heat like aluminium, they are used to make utensils.

→ Iron is used in construction of buildings.

→ Aluminium is used in transmission wires and cables.

→ Aluminium is used for making cooking vessels also.

→ Copper is used for making coins, statues and so on.

Non-metals:

→ Oxygen is non metal and it plays very important role in the respiration of living organisms.

→ Chlorine is used to disinfect impure water.

→ Iodine is used as an antiseptic.

→ Phosphorus is used in making fireworks/crackers.

→ Hydrogen is used for making ammonia.

→ Coal is used as fuel.

→ Sulphur is used as fungicide and insecticide.

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