Chemistry-
General
Easy
Question
Hydrogen burns in air with a
- (a) Light bluish flame
- Yellow flame
- (c) Green flame
- None of these
The correct answer is: (a) Light bluish flame
Hydrogen burns in air with a light bluish flame.
Related Questions to study
Chemistry-
Metal hydride on treatment with water gives
Metal hydride on treatment with water gives
Chemistry-General
Chemistry-
Which is used hydrogen generators
Which is used hydrogen generators
Chemistry-General
Chemistry-
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.
Chemistry-General
Physics-
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.
Physics-General
Physics-
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.
Physics-General
Physics-
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.
Reason : This is due to difference in reactivity towards oxygen.
Physics-General
Physics-
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.
Physics-General
Physics-
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.
Physics-General
Physics-
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.
Physics-General
Physics-
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.
Physics-General
Physics-
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.
Physics-General
Physics-
Assertion :Chemistry of Actinoids is more complicated than Lanthanoids.
Reason : Actinoid elements are radioactive.
Assertion :Chemistry of Actinoids is more complicated than Lanthanoids.
Reason : Actinoid elements are radioactive.
Physics-General
Physics-
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.
Physics-General
Chemistry-
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.
Chemistry-General
Chemistry-
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.
Chemistry-General
