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Standard VIII

Chemistry

Physical Properties of Nonmetals

Element A is ...

Question

Element A is soft,brittle and does not conduct electricity.Element B is hard,malleable and ductile,and also conducts electricity. Which of the two elements,A or B,is a non-metal ?

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Solution

Element A - is a non metal.

Non metals are soft , brittle and do not conduct electricity.( Exception - Graphite)
Metals , on the other hand, are hard,malleable and ductile,conduct electricity.

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Similar questions

Sulphur element is said to be :

(a) ductile

(b) hard

(d) brittle

Q. A student is given samples of three elements X, Y, and Z, which could be an alkali metal, a member of group IVA, and a member of group VA. He makes the following observations:

Element X has a metallic luster and conducts electricity. It reacts slowly with

H C l

to produce

H_{2}

gas. Element Y is a light-yellow solid that does not conduct electricity. Element Z has a metallic luster and conducts electricity. When exposed to air, it slowly forms a white powder giving a basic solution in water.

Element X can be

Q. A student is given samples of three elements,

X, Y

, and

Z

, which could be an alkali metal, a member of group IVA, and a member of group VA. She makes the following observations
The element

X

has a metallic luster and conducts electricity. It reacts slowly with aq

H C l

to produce

H_{2}

gas. The element

Y

is a light-yellow solid and does not conduct electricity. The element

Z

has a metallic luster and conducts electricity. When exposed to air, it slowly forms a white powder aqueous solution of which is basic. What can you conclude about the elements from these observations?

X

can be:

Name:

(a) two metals which are liquid at room temperature,

(b) metal which do not corrode easily

(d) a non-metal which is lustrous,

(e) a non-metal which conducts electricity,

(f) a metal which is brittle,

(g) two elements which are monoatomic,

(h) two metallic oxides which are acidic,

(i) two metallic oxides which are amphoteric,

(j) two metallic which react with cold water,

(k) the compound responsible for green deposit on the surface of copper,

(l) a non-metal which can form a positive ion,

(m) a non-metal which shows reducing property,

(n) a metal whose oxide is reduced only by carbon.

Compare the properties of metals and non-metals with respect to :(i) malleability (ii) ductility, and (iii) conduction of heat and electricity.

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Element A is soft,brittle and does not conduct electricity.Element B is hard,malleable and ductile,and also conducts electricity. Which of the two elements,A or B,is a non-metal ?

Element A - is a non metal. Non metals are soft , brittle and do not conduct electricity.( Exception - Graphite) Metals , on the other hand, are hard,malleable and ductile,conduct electricity.

Element A - is a non metal.

Non metals are soft , brittle and do not conduct electricity.( Exception - Graphite)
Metals , on the other hand, are hard,malleable and ductile,conduct electricity.