Tag: chemistry

Questions Related to chemistry

Articles made of metals produce ringing sound when struck hard.

chemistry metals physical properties of metals and non-metals some physical properties of metals general characteristics and uses of metals

  1. True

  2. False

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Correct Option: A
Explanation:

Sonority is the property of a metal in producing a characteristic resonant sound when struck. All metals are highly sonorous and sonority varies with metals.

Metals are generally hard. Which of the following metals is an exception and can be cut with a knife?

chemistry metals physical properties of metals and non-metals some physical properties of metals general characteristics and uses of metals

  1. Iron

  2. Sodium

  3. Gold

  4. Magnesium

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Correct Option: B
Explanation:

Metals, in general, are hard as solids at room temperature but sodium is a metal that is exceptional. 


Sodium is stored in kerosene and is soft that it can be cut with a knife.

Hence the correct option is B.

A metal M which is one of the best conductor of heat and electricity used in making electric wires is found in the nature as sulphide ore, $M _2S$. Name the metal M.

chemistry metals physical properties of metals and non-metals some physical properties of metals general characteristics and uses of metals

  1. Cu

  2. Al

  3. Fe

  4. Ag

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Correct Option: A
Explanation:

Metal 'M' is copper which is one of the best conductor of heat and electricity used in making electric wires is found in nature as sulphide ore $(Cu _2S).$

Hence option A is correct answer.

Metals generally have ______ number of electron(s) in their valence shell.

chemistry metals physical properties of metals and non-metals some physical properties of metals general characteristics and uses of metals

  1. 1, 2, or 3

  2. 7, 8 or 9

  3. 10, 11, or 12

  4. 20, 30, or 40

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Correct Option: A
Explanation:

Alkali and alkaline earth metals have valence electrons as 1 and 2 respectively. In general, elements with 1-3 valence electrons can be metal except for hydrogen and helium (nonmetal) and Boron (metalloid). Also, transition elements have 2 valence electrons but since they can utilize d-orbital for bonding, therefore can have variable oxidation states.
Therefore in general  1-3 valence electrons can be meta.
Hence, option $A$ is correct.

Metals are usually hard. Hence metals are strong and can withstand heavy loads over them. Due to this property, they are difficult to cut and can be used in the construction of heavy machines, building etc.
On the other hand, non-metals are usually brittle. On hammering them they break into small pieces converting themselves into a fine powder.


Thus an element that is relatively strong is relatively :

chemistry metals physical properties of metals and non-metals some physical properties of metals general characteristics and uses of metals

  1. Brittle

  2. Malleable

  3. Hard

  4. Ductile

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Correct Option: C
Explanation:

Element that is relatively strong have strong force of attraction and difficult to break and are considered to be relatively hard.

Metallic lustre is explained by :

chemistry metals physical properties of metals and non-metals some physical properties of metals general characteristics and uses of metals

  1. oscillation of loose electrons 

  2. diffusion of metal ions

  3. excitation of free protons

  4. existence of B.C.C. lattice

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Correct Option: A
Explanation:

The metallic lustre of a metal is due to the oscillation of loosely bound electrons.


When light falls upon the electrons, they absorb energy and are set into oscillation, and they emit radiations which are responsible for the metallic lustre.

Hence, te correct option is $\text{A}$

Which among the following elements is not lustrous?

chemistry metals physical properties of metals and non-metals some physical properties of metals general characteristics and uses of metals

  1. Cooper

  2. Gold

  3. Iron

  4. Iodine

  5. None of these

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Correct Option: E

Arrange the following in increasing order of solubility in $H _2O$.


$AgCl,\  AgBr,\ AgI,\ AgF$

chemistry metals physical properties of metals and non-metals some physical properties of metals general characteristics and uses of metals

  1. $AgI < AgBr < AgCl < AgF$

  2. $AgI < AgBr < AgF < AgCl$

  3. $AgI < ACl < AgBr < AgF$

  4. None of these

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Correct Option: A
Explanation:

Solubility in water depends on the size. Smaller is the size of the anion, more it is solvated and more is the solubility.


AgI < AgBr  < AgCl < AgF

Arrange the following in increasing order of solubility in $H _2O$?

$NaF, MgO, AlN$

chemistry metals physical properties of metals and non-metals some physical properties of metals general characteristics and uses of metals

  1. $AlN < MgO < NaF$

  2. $MgO < AIN < NaF$

  3. $AlN < NaF < MgO$

  4. None of these

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Correct Option: A
Explanation:

More the charge on the ions, more is the covalent character. Hence, the order of covalent charcter is $AlN  > MgO > NaF$. More is the covalent character, less is the solubility in water.

The order of solubility in water is $AlN < MgO < NaF$.

Choose the most elastic substance from the following option.

chemistry metals physical properties of metals and non-metals some physical properties of metals general characteristics and uses of metals

  1. Rubber

  2. Nylon

  3. Steel

  4. Iron

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Correct Option: C
Explanation:

Elasticity is the property of solid materials to return to their original shape and size after the forces deforming them have been removed.


Steel is more elastic than any other thing because steel comes back to its original shape faster than rubber when the deforming forces are removed.

Hence, option C is correct.