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 group 17 elements - trends in chemical properties group 17 elements - properties p- block elements-ii p-block elements chemistry

Halogens have:

  1. high ionisation energies

  2. high electronegativities

  3. high electron affinities

  4. All the above
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Halogens have high ionisation energies, high electronegativities and high electron affilities due to their smallest size in a particular period. As size decreases ionisation energy, elctronegativity and electron affinity increaes

Multiple choice group 17 elements - trends in chemical properties group 17 elements - properties p- block elements-ii p-block elements chemistry

The element with highest electron affinity among the halogens is :

  1. F
  2. $Cl$

  3. Br
  4. $I$
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

As moving down the group electron affinity of elements decreases

But in case of $\textbf{Fluorine}$, it is a small atom with a small amount of space available in its 2p orbital. Because of this, any new electron trying to attach to fluorine experiences lower electron affinity from the electrons already living in the element's 2p orbital. Since chlorine's outermost orbital is a 3p orbital, there is more space, and the electrons in this orbital are inclined to share this space with an extra electron. Therefore, chlorine has a higher electron affinity than fluorine, and this orbital structure causes it to have the highest electron affinity of all of the elements.

Hence electron affinity of $\textbf{Chlorine}$ is higher in halogens.

Multiple choice group 17 elements - trends in chemical properties group 17 elements - properties p- block elements-ii p-block elements chemistry

Which of the following is incorrect?

  1. iodine is a solid

  2. chlorine is insoluble in water

  3. iodine is more reactive than bromine

  4. bromine is more reactive than chlorine
Reveal answer Fill a bubble to check yourself
B,C,D Correct answer
Explanation

Reactivity order:-
$F _2>Cl _2> Br _2>I _2$
Thus, chlorine is more reactive than bromine and bromine is more reactive than iodine.

Chlorine is soluble in water.

Multiple choice group 17 elements - trends in chemical properties group 17 elements - properties p- block elements-ii p-block elements chemistry

Elements of which family are in colored gaseous state, in liquid state and with metallic properties.

  1. least-reactive family of elements

  2. alkali metals

  3. halogen family of elements

  4. noble gases

  5. family whose oxides form acids in water
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Elements of halogen family are in colored gaseous state, in liquid state and with metallic properties.
At room temperature, fluorine and chlorine are gases, bromine is a liquid and iodine is a solid.
The colours of fluorine, chlorine, bromine and iodine are yellow, greenish yellow, red and violet.
Iodine has metallic luster.

Multiple choice chemistry non-metals introduction to non-metals occurence of metals occurrence of metals and non metals

Metals found at the top of the reactivity series are never found in free-state because

  1. They are less reactive

  2. They are highly reactive

  3. They are moderately reactive

  4. None of above
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Metals found at the top of the reactivity series are never found in free-state as they are very reactive, e.g. K, Na, Ca, Mg and Al, etc.

Multiple choice chemistry chemistry of non-metals oxides of elements simple oxides oxygen

Select the correct option regarding the properties of dioxygen?

  1. Dioxygen never reacts with metals.

  2. Dioxygen is diamagnetic in nature.

  3. Combination of dioxygen with other elements is highly exothermic process.

  4. Dioxygen liquefies at 55 K and freezes at 90 K.
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Dioxygen reacts with metals and is paramagnetic. It combines with other elements to form oxides where the reaction is highly exothermic.

Multiple choice chemistry chemistry of non-metals oxides of elements simple oxides oxygen

Which of the following elements forms amphoteric oxides?

  1. Beryllium

  2. Aluminium

  3. Zinc

  4. All
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

An amphoteric species is a molecule or ion that can react as an acid as well as base. The word amphoteric means both. Many metals such as copper, zinc, tin, lead, aluminium and beryllium form amphoteric oxides or hydroxides.

Multiple choice chemistry chemistry of non-metals oxides of elements simple oxides oxygen

Which of the following shows the tendency to from peroxide?

  1. Lithium

  2. Magnesium

  3. Berylium

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

Lithium shows tendency to form peroxide (Li2O2) unlike other alkali metals. This is due to its small size and high charge density. Other alkali metals primarily form normal oxides.

Multiple choice chemistry chemistry of non-metals oxides of elements simple oxides oxygen

Which one of the following statement is true?

  1. According to the modern atomic theory, atoms of the same element may have different atomic weights

  2. Reduction is the process of electron loss

  3. Acidic oxide are the non-metallic oxides

  4. The solubility of all substances decreases with increase in temperature
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Acidic oxides are the oxides which reacts with water to form an acid. Acidic are non- metallic oxides. Some of the examples are ${ SO } _{ 3 }$ forms sulphuric acid and ${ CO } _{ 2 }$ forms carbonic acid. 

So, correct answer is option C.

Multiple choice nuclear reactions nuclear structure nuclei atomic nuclei physics

The binding energy of $ _{3}{Li}^{7}$ and $ _{2}{He}^{4}$ are $39.2  MeV$ and $28.24  MeV$ respectively. Which of the following statements is correct?

  1. Helium is more stable than lithium.

  2. Lithium is more stable than helium.

  3. Both are equally stable

  4. None of the above
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The nucleons present in $ _{3}{Li}^{7}$ is $7$.
The binding energy per nucleon for lithium is ${39.2}/{7} = 5.6  MeV$
The binding per nucleon for helium is ${28.24}/{4} = 7.06  MeV$
The binding energy per nucleon is the measure of stability of the nuclei. Therefore, helium is more stable than lithium.

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 $\text{A}$