Hydrogen molecules differs from chlorine molecule in the following respect
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Solution
Chlorine has lone pair which it can donate to form coordinate bond while hydrogen cannot.
Hydrogen can be differentiated by other alkali metals due to its :
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Solution
Hydrogen can be differentiated from after group I elements due to its non-metallic character.
Which statement is correct for hydrogen ?
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Solution
The correct option is (c).
In H2O, hydrogen has +1 oxidation no. In CaH2, hydrogen has -1 oxidation no.
When two ice cubes are pressed over each other, they unite to form one cube. Which of the following forces is responsible to hold them together ?
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Solution
Two ice cubes stick to each other due to H-bonding
Which one of the following pairs of substances on reaction will not evolve H2 gas?
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Solution
Fe + dil.H2SO4 → FeSO4 + H2 ↑
3Fe + 4H2O → Fe2O4 + 4H2 ↑
Cu + dil.HCl → No reaction
Copper does not evolve H2 from acid as it is below hydrogen in electro chemical series.
2Na + 2C2H5OH → 2C2H5ONa + H2 ↑
Which of the following statement is not correct regarding hydrogen atom?
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Solution
Actually hydrogenis in the first group of periodic table due to its much resemblance with alkali metals
The ionization of hydrogen atom would give rise to
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Solution
H(g) → H(g)+ + e-
The number of moles of H2 in 0.224 litre of hydrogen gas at STP (273 K, 1 atm) is :
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Solution
∵ 22.4 L of H2 at STP = 1 mole of H2
∴ 0.224 L of H2 at STP = 1⁄22.4 × 0.224 = 0.01 moles.
Hydrogen has high ionization energy than alkali metals because it has :
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Solution
Hydrogen has high ionisation energy in comparision with alkali metals because it has only one orbital i.e.smaller size.
Due to smaller size, hold of nucleus on outer most electron is greater in case of hydrogen.
Hydrogen is not more reactive at ordinary temperature, because at ordinary temperature it is in its:
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Solution
Hydrogen is not reactive at ordinary temperature because it is in molecular state i.e., as H2 with its complete duplet which makes it stable and lesser reactive.
At very high temperature, hydrogen exists in atomic form having one electron i.e., incomplete duplet which makes it less stable and highly reactive.