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 general knowledge science & technology

In a massive dying star that form red supergiants, elements higher in atomic number than Hydrogen & Helium also starts fusion due to crushing pressure of the star's own gravitation & form elements of higher atomic number & it continues recursively. Which is the element that is formed last with the maximum atomic number this way & heavier atoms beyoond this are formed in trace amounts only?

  1. Iron

  2. Prometheum

  3. Barium

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

In massive stars, fusion progresses from hydrogen to helium through increasingly heavier elements, culminating in iron (Fe-56). Iron has the highest binding energy per nucleon, so fusion beyond iron requires energy input rather than releasing it. Elements heavier than iron form primarily through neutron capture during supernovae, not normal stellar fusion.

Multiple choice general knowledge science & technology

In a massive dying star that form red supergiants, elements higher in atomic number than Hydrogen & Helium also starts fusion due to crushing pressure of the star's own gravitation & form elements of higher atomic number & it continues recursively. Which is the element that is formed last with the maximum atomic number this way & heavier atoms beyoond this are formed in trace amounts only?

  1. Iron

  2. Prometheum

  3. Barium

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

In massive red supergiants, stellar nucleosynthesis progresses through successive fusion stages: hydrogen to helium, then to carbon, oxygen, neon, silicon, and finally iron. Iron (Fe-56) has the highest nuclear binding energy per nucleon, making fusion beyond iron endothermic rather than exothermic. Heavier elements are primarily formed during supernovae, not during the star's stable fusion phase.

Multiple choice general knowledge

Hydrogen has the tendency to gain one electron to acquire helium configuration. In this tendency, it resembles

  1. Alkali metals

  2. Inert gases

  3. Alkaline earth metals

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

Hydrogen can gain one electron to achieve the stable helium configuration (1s²), which is characteristic of halogens (Group 17 elements) that need one electron to complete their octet. This is why hydrogen is placed above fluorine in some periodic tables, showing 'halogen-like' behavior. Alkali metals lose electrons, inert gases already have stable configurations, and alkaline earth metals lose two electrons.

Multiple choice general knowledge science & technology

Which element has the highest boiling point?

  1. Diamond

  2. Platinum

  3. Tantalum

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

Tantalum has the highest boiling point (approximately 5,458°C or 9,856°F) among the given options. This refractory metal is extremely heat-resistant, making it valuable for high-temperature applications like jet engine components and nuclear reactors. Diamond is not an element but pure carbon, platinum melts at a lower temperature, and titanium also has a lower boiling point.

Multiple choice general knowledge science & technology

Which of the following is in liquid form at room temperature?

  1. Lithium

  2. Sodium

  3. Francium

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

Francium is liquid at or slightly above room temperature (melting point ~27°C), though it's extremely rare and radioactive. Lithium melts at 180°C, sodium at 98°C, and cerium at 795°C - all solid at room temperature (25°C). Francium's low melting point follows the trend of increasing atomic size in Group 1.

Multiple choice

Which of the following is an incorrect statement regarding alkaline earth metals?

  1. Be is amphoteric.

  2. All alkaline earth metals react with cold water and evolve hydrogen.

  3. Mg and Be form organometallic compounds.

  4. Carbonates and oxalates of alkaline earth metals are insoluble in water.

  5. The standard potential of Be is more than Ca.
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Be does not reacts with cold water. It reacts with steam, Mg reacts with hot water whereas Ca, Sr and Ba react rapidly with cold water to give hydrogen.

Multiple choice

Which of the following statements is incorrect?

  1. The first ionization potential of Al is less than the first ionization potential of Mg.

  2. The second ionization potential of Mg is greater than the second ionization potential of K.

  3. Na has higher value of first ionization potential than Mg.

  4. Mg2+ has zero unpaired electron.

  5. Magnesium hydroxide is used as antacid.
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Mg+ requires less energy for further ionization than K+ due to noble gas configuration.

Multiple choice

Which of the following statements is FALSE regarding f-block elements?

  1. General electronic configuration of f block elements is (n - 2)f1-14 (n - 1)d0-1 ns2.

  2. The actinides generally have lower ionization enthalpies than lanthanides.

  3. Lanthanides are silvery white metals because of f-f transition.

  4. All lanthanides are non-radioactive.

  5. Uranium belongs to the actinides.
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

All lanthanides are non-radioactive except promethium.

Multiple choice

Which of the following statements is/are TRUE?

  1. 4f orbital electrons are more shielded than 5f orbital electrons.
  2. Mn is the third most abundant transition element in earth’s crust.
  3. Zr and Hf have almost same atomic radius.
  4. Constantan is a copper-zinc alloy.

Select the correct answer.

  1. 1 and 2 only

  2. 1 and 4 only

  3. 2 and 3 only

  4. 2 and 4 only

  5. 3 and 4 only
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

5f orbital is more effectively shielded from nuclear charge than 4f orbital. Constantan is a copper-nickel alloy usually consisting of 55% copper and 45% nickel.

Multiple choice

Which of the following statements are FALSE?

  1. Compounds of alkaline earth metals are less hydrated than those of alkali metals.
  2. Quicklime exhibits thermoluminescence.
  3. Aqueous solution of calcium hydroxide is known as milk of lime.
  4. Oxide and hydroxide of beryllium are amphoteric in nature.

  1. Both 1 and 2

  2. Both 1 and 3

  3. Both 1 and 4

  4. Both 2 and 3

  5. Both 3 and 4
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Compounds of alkaline earth metals are more extensively hydrated than those of alkali metals.