Chemistry-
General
Easy

Question

Hydrogen burns in air with a

  1. (a) Light bluish flame  
  2. Yellow flame  
  3. (c) Green flame  
  4. None of these  

The correct answer is: (a) Light bluish flame


    Hydrogen burns in air with a light bluish flame.

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    Assertion:First ionization energy for nitrogen is lower than oxygen.
    Reason :Across a period effective nuclear charge decreases.

    Assertion:First ionization energy for nitrogen is lower than oxygen.
    Reason :Across a period effective nuclear charge decreases.

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    Assertion :Outermost electronic configuration of most electropositive elements is ns2 np3.
    Reason :ns2 np3 is stable due to half filled subshell.

    Assertion :Outermost electronic configuration of most electropositive elements is ns2 np3.
    Reason :ns2 np3 is stable due to half filled subshell.

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    Assertion :NO ion is isoelectronic with CN ion.
    Reason :Isoelectronic ions have same number of elelctrons.

    Assertion :NO ion is isoelectronic with CN ion.
    Reason :Isoelectronic ions have same number of elelctrons.

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    Assertion :I.E. of 7N is more than that of 8O as well as 6C.
    Reason : This is due to difference in reactivity towards oxygen.

    Assertion :I.E. of 7N is more than that of 8O as well as 6C.
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    Assertion :Ground state configuration of Cr is 3d5, 4s1.
    Reason : A set of half filled orbitals containing one electron each with their spin parallel provides extra stability to the system.

    Assertion :Ground state configuration of Cr is 3d5, 4s1.
    Reason : A set of half filled orbitals containing one electron each with their spin parallel provides extra stability to the system.

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    Assertion :More is the electron affinity greater is the reducing character.
    Reason : Reducing character depends on number of electrons gained.

    Assertion :More is the electron affinity greater is the reducing character.
    Reason : Reducing character depends on number of electrons gained.

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    Assertion :Ionization potential across the period is Na < Al < Mg < Si.
    Reason : Ionization potential decreases with decrease in atomic size.

    Assertion :Ionization potential across the period is Na < Al < Mg < Si.
    Reason : Ionization potential decreases with decrease in atomic size.

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    Assertion :Shielding effect increases as we go down the group.
    Reason : More is the number of electrons in the penultimate shell, more is shielding.

    Assertion :Shielding effect increases as we go down the group.
    Reason : More is the number of electrons in the penultimate shell, more is shielding.

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    Assertion :Ionization enthalpy is always negative.
    Reason : Energy is always released when electrons are removed.

    Assertion :Ionization enthalpy is always negative.
    Reason : Energy is always released when electrons are removed.

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    Assertion :Chemistry of Actinoids is more complicated than Lanthanoids.
    Reason : Actinoid elements are radioactive.

    Assertion :Chemistry of Actinoids is more complicated than Lanthanoids.
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    Assertion :Atomic number of the element ununbium is 112.
    Reason : Name for digits 1 and 2 is un-and bi-respectively in latin words.

    Assertion :Atomic number of the element ununbium is 112.
    Reason : Name for digits 1 and 2 is un-and bi-respectively in latin words.

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    Assertion :The first ionisation energy of Be is greater than boron [AIIMS 2002]
    Reason : 2p orbitals have lower energy than 2s orbitals.

    Assertion :The first ionisation energy of Be is greater than boron [AIIMS 2002]
    Reason : 2p orbitals have lower energy than 2s orbitals.

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    Assertion :Noble gases have maximum electron affinity.
    Reason : High electron affinity shows that the electron is loosely bonded to the atom.

    Assertion :Noble gases have maximum electron affinity.
    Reason : High electron affinity shows that the electron is loosely bonded to the atom.

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