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

Which of the following is the strongest reducing agent?

  1. Sodium

  2. Magnesium

  3. Aluminum

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

Greater the tendency to lose electrons, stronger is the reducing agent. Here the atom of sodium has the maximum metallic character. So, it is the strongest reducing agent.

Multiple choice

Which property differs Be and Al from each other?

  1. Exhibiting maximum covalency in compounds

  2. Forming polymeric hydrides

  3. Forming covalent hydrides

  4. Exhibiting amphoteric nature in their oxides

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

Be, Z = 4 has maximum covalency of 4 while Al, Z = 13 has maximum covalency of 6.

 

Multiple choice

Which group of elements is un-reactive?

  1. Noble Gases

  2. Inner transition metals

  3. Transition metals

  4. Alkaline-earth metals
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Noble gases have a full valence electron shell, making them chemically inert or un-reactive under standard conditions.

Multiple choice chemistry classification of elements- the periodic table periodic trends in physical properties properties and trend trends in periodic table electronic configuration and valency electron configuration

On the Mulliken scale, the average of ionization potential and electrons affinity is known as _____(electronegativity/affinity).

  1. electronegativity

  2. electroneaffinity

  3. electropositivity

  4. none
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

On Mulliken scale, the average of ionization potential and electrons affinity is known as electronegativity.

Multiple choice chemistry classification of elements- the periodic table periodic trends in physical properties properties and trend trends in periodic table electronic configuration and valency electron configuration

Which pair of element has almost identical electronegativity values?

  1. $In,Tl$
  2. $B,Al$
  3. $B,Ga$
  4. $Al,Tl$
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Both have close IE and electron affinity values(both are metals) and hence similar electronegativity values.
$Electronegativity=\dfrac{IE+EA}{2}$

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

What is the atomic mass of sodium?

  1. $22\ g/mol$
  2. $23\ g/mol$
  3. $11\ g/mol$
  4. $20\ g/mol$
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

A relative atomic mass is a measure of how heavy atoms are. It is the ratio of the average mass per atom of an element from a given sample to 1/12 the mass of a carbon-12 atom.

The relative atomic mass in 1 mole of isotopes of sodium atoms is 23 g/mol.