Chemistry · Science General

Periodic Table and Elements

421 Questions

The periodic table and elements questions test knowledge of chemical properties, atomic structures, and periodic trends. Topics include alkali metals, transition elements, and ionisation potential. These concepts frequently appear in general science sections of competitive examinations.

Alkali metals propertiesTransition elementsLattice energyIonisation potentialAlkaline earth metals

Periodic Table and Elements Questions

Multiple choice chemistry the language of chemistry atomic weight and molecular weight masses of atoms and molecules chemical analysis and formulae

What is the relative atomic mass of cadmium?

  1. 112.411 amu

  2. 20.00 amu

  3. 21.00 amu

  4. 20.43 amu
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The relative atomic mass is an average of the atomic masses of all the different isotopes in a sample, with each isotope's contribution to the average determined by how big a fraction of the sample it makes up.
The relative atomic mass of Cadmium is 112.411 amu.

Multiple choice bonding in metals metallic bonding chemical bonding and structure chemical bonding and molecular structure chemistry

Iron is tougher than sodium because :

  1. iron atom is smaller

  2. iron atoms are more closely packed

  3. metallic bonds are stronger in iron

  4. none of these
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation
Iron is tougher than sodium because metallic bonds are stronger in iron.
Stronger is metallic bonding (FeFe has dd -subshell), more is hardness.

Hence, it is hard than Sodium like other alkali metals are soft.

So, the correct option is $C$
Multiple choice ionic bond atomic structure and chemical bonding chemistry

Some atoms attain their noble gas configuration by transfer of electrons. This method of attaining inert gas configuration is known as :

  1. electrovalency

  2. covalency

  3. inertness

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

Electrovalency is the process of attaining inert gas configuration by transfer of electrons.

Multiple choice chemistry the s-block elements (alkali and alkaline earth metals) biological importance of sodium and potassium biological importance of elements biological importance of s block elements

Select the incorrect statement:

  1. sodium and potassium are $6$th and $7$th most abundant element in the earth's crust
  2. $NaOH$ is hygroscopic in nature
  3. if a crystal of $NaOH$ is exposed to air for longer periods it potassium a white powder of $Na _{2}CO _{3}$

  4. lithium is an alkali metal and can be used in photoelectric cells
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation
Among alkali metals, cesium has lowest ionisation enthalpy and hence it can show photoelectric effect to the maximum extent and therefore preffered in photoelectric cell. The alkali metal widely used in photoelectric cell is Cs
Alkali metals have lower ionisation energy than their counterparts and hence havemhigher chance of emitting electrons, when  a radiation falls on them. So they are used in photoelectric cells so that they easily emit electron when energy containing photons in sunlight strikes them.
Hence option D is incorrect statement
Multiple choice limestone uses of group 2 compounds group 2 industrial inorganic chemistry chemistry

The hydration energy of ${Mg}^{+2}$ is larger than that of ?

  1. ${Al}^{+3}$
  2. ${Na}^{+1}$
  3. ${Be}^{+2}$
  4. ${Mg}^{+3}$
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Hydration energy depends on charge of ion and ionic radius. Higher the charge, greater the hydration energy. On the other hand, smaller the size, greater the hydration energy. Charge is considered first for comparison. Hence, $Mg^{2+}$ has higher hydration energy than $Na^+$.

Multiple choice limestone uses of group 2 compounds group 2 industrial inorganic chemistry chemistry

Mg and Zn have following resemblance :

  1. MgO and ZnO are amphoteric.
  2. $MgCO _3$ and $ZnCO _3$ both on heating give corresponding oxide.

  3. both are d-block elements.

  4. both are used to prevent corrosion.
Reveal answer Fill a bubble to check yourself
B,D Correct answer
Explanation

A) MgO is basic oxide and ZnO is acidic oxide.

B) $MgCO _3$ and $ZnCO _3$ both on heating give corresponding oxide(MgO and ZnO) carbon dioxide.

C) Mg is s block and Zn is d block element,both are not d block

D) both are used to prevent corrosion(Corrosion is the gradual destruction of 
materials (usually metals) by chemical reaction with their environment. In the most common use of the word, this means electrochemical oxidation of metals in reaction with an oxidant such as oxygen).

Hence options  B & D are correct.

Multiple choice chemistry atomic theory, periodic classification and properties of elements introduction to periodic table necessity of classification need for classification

Predict block, group and period of $Sb$.

  1. Block-$p$, Period-$5$, Group-$15$
  2. Block-$p$, Period-$5$, Group-$14$
  3. Block-$s$, Period-$5$, Group-$13$
  4. Block-$s$, Period-$5$, Group-$11$
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Antimony is a chemical element with symbol $Sb$ (from Latin: stibium) and atomic number $51$,group $15$ (pnictogens), $p$-block,period $5$.

Multiple choice chemistry atomic theory, periodic classification and properties of elements introduction to periodic table necessity of classification need for classification

Alkali and alkaline earth metals are ________ elements.

  1. same

  2. different

  3. both A and B

  4. none of these
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Alkali and alkaline earth metals are group I and group II elements of s block representative elements with ns$^1$ and ns$^2$ valence shell configuration respectively.


Hence, option B is correct.

Multiple choice chemistry combustion extinguishing fire ways to control fire combustion, fuels and flame

Some uses of chlorine and bromine are given.
Which is a use of bromine?

  1. making bleaches for textiles and the the paper industry

  2. making CFC's

  3. making flame retardants and fire extinguishers

  4. making the polymer PVC
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

In general, the stability of bromine in a typical flame retardant molecule means that the molecule can offer the highest activity as a flame active retardant, while also being cost effective.  The choice of flame retardant systems for any particular application depends on how the material decomposes in a fire, as well as the materials’ physical property. Brominated flame retardants, because they act in the flame, can be used in just about every application.

Multiple choice chemistry the periodic table newland's law of octaves development of the modern periodic table into the history

X and Y are two elements having similar properties which obey Newlands law of octaves. The number of elements in between X and Y respectively are:

  1. 8

  2. 6

  3. 7

  4. 9
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Newlands' law of octaves states that every eighth element has properties similar to the first. If X is the first element, the eighth element is Y. The number of elements between them is 8 - 1 - 1 = 6.

Multiple choice chemistry the s-block elements (alkali and alkaline earth metals) biological importance of magnesium and calcium biological importance of elements biological importance of s block elements biological importance of sodium and potassium

Which of the following statements is/are false?

  1. The halides of beryllium are electron deficient and are polymeric with halogen bridges.
  2. $BeF _2$ is very soluble in water owing to high solvation energy of Be but fluorides of other alkaline earth metals are almost insoluble.

  3. CaO, SrO and BaO react exothermically with water forming soluble hydroxides.

  4. The bicarbonates of alkaline earth metals are only stable in solutions.
Reveal answer Fill a bubble to check yourself
A,B,C,D Correct answer