Tag: hydrogen in periodic table

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Multiple choice chemistry study of the first element - hydrogen position of hydrogen in the periodic table hydrogen in periodic table trends in groups and periods

Which of the following properties of hydrogen is incorrect?

  1. Like halogens, hydrogen exists as a diatomic gas

  2. Like halogens, hydrogen exhibits - 1 oxidation state in its compounds with metals

  3. Like halogens, hydrogen is liberated at cathode

  4. The ionization energy of hydrogen is quite close to halogens
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation
Like halogens, hydrogen is liberated at anode, e.g. 
2NaH $\rightarrow 2Na + H _{2} $ (at anode
2NaCl $\rightarrow  2Na + cl _{2}$ (at anode)
Multiple choice chemistry study of the first element - hydrogen position of hydrogen in the periodic table hydrogen in periodic table trends in groups and periods

The order of reactivity of halogens towards hydrogen is:

  1. $F _{2} > Cl _{2} > Br _{2} > I _{2}$
  2. $I _{2} > Br _{2} > Cl _{2} > F _{2}$
  3. $Cl _{2} > Br _{2} > I _{2} > F _{2}$
  4. $Br _{2} > Cl _{2} > F _{2} > I _{2}$
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The reactivity of halogens towards hydrogen decreases down the group due to the decrease in electronegativity and increase in bond length. Thus, F2 > Cl2 > Br2 > I2.

Multiple choice chemistry study of the first element - hydrogen position of hydrogen in the periodic table hydrogen in periodic table trends in groups and periods

Which of the following statement is correct regarding hydrogen?

  1. Hydrogen shows +1 and -1 oxidation states

  2. Hydrogen is never liberated at anode

  3. Hydrogen has same ionisation enthalpy as that of alkali metals

  4. Hydrogen has same electronegativity as of halogens
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Hydrogen has +1 oxidation state in compounds with more electronegative elements e.g. $HF$. It has -1 oxidation state in compounds with more electropositive elements like $NaH$. In the above compounds with $Na$ and $F$ show +1 and -1 oxidation state respectively.