Tag: chemistry

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Questions Related to chemistry

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

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

  1. Iron

  2. Sodium

  3. Gold

  4. Magnesium
Reveal answer Fill a bubble to check yourself
B Correct answer
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.

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

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.

  1. Cu

  2. Al

  3. Fe

  4. Ag
Reveal answer Fill a bubble to check yourself
A Correct answer
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.

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

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

  1. 1, 2, or 3

  2. 7, 8 or 9

  3. 10, 11, or 12

  4. 20, 30, or 40
Reveal answer Fill a bubble to check yourself
A Correct answer
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.

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

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 :

  1. Brittle

  2. Malleable

  3. Hard

  4. Ductile
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

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

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

Metallic lustre is explained by :

  1. oscillation of loose electrons

  2. diffusion of metal ions

  3. excitation of free protons

  4. existence of B.C.C. lattice
Reveal answer Fill a bubble to check yourself
A Correct answer
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 $\text{A}$

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

Which among the following elements is not lustrous?

  1. Cooper

  2. Gold

  3. Iron

  4. Iodine

  5. None of these
Reveal answer Fill a bubble to check yourself
E Correct answer
Explanation

Copper, gold, and iron are all metals with characteristic luster. Iodine is a non-metal that appears as shiny purple-black crystals but is not considered truly lustrous like metals. 'None of these' is correct because all the listed elements have some degree of luster, making the question poorly framed.

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

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


$AgCl,\  AgBr,\ AgI,\ AgF$

  1. $AgI < AgBr < AgCl < AgF$
  2. $AgI < AgBr < AgF < AgCl$
  3. $AgI < ACl < AgBr < AgF$

  4. None of these
Reveal answer Fill a bubble to check yourself
A Correct answer
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

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

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

$NaF, MgO, AlN$

  1. $AlN < MgO < NaF$
  2. $MgO < AIN < NaF$
  3. $AlN < NaF < MgO$

  4. None of these
Reveal answer Fill a bubble to check yourself
A Correct answer
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 $AlN < MgO < NaF$.

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

Choose the most elastic substance from the following option.

  1. Rubber

  2. Nylon

  3. Steel

  4. Iron
Reveal answer Fill a bubble to check yourself
C Correct answer
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.