Number of metal ions characterized by flame test among the following is _______.
$\text{Sr}^{2+}, \text{Ba}^{2+}, \text{Ca}^{2+}, \text{Cu}^{2+}, \text{Zn}^{2+}, \text{Co}^{2+}, \text{Fe}^{2+}$

Question

Statement-I : Consider the following pairs of ions $(\text{Sc}^{3+}, \text{Ti}^{3+}), (\text{Ti}^{4+}, \text{Ni}^{2+}), (\text{Cu}^{2+}, \text{Zn}^{2+})$ and $(\text{Cr}^{3+}, \text{Mn}^{3+})$. Out of these pairs three pairs consist of ions that are both coloured :
Statement-II : Among the lanthanide ions $\text{Eu}^{2+}$, $\text{Gd}^{3+}$, $\text{Ce}^{4+}$ and $\text{Tb}^{4+}$, the ion $\text{Tb}^{4+}$ is the strongest reducing agent.
Choose the correct option.

Answer 1

To determine the count of metal ions identifiable by flame test, identify those yielding characteristic flame colors from the provided list.

Analysis of Each Metal Ion:

Sr²⁺: Emits a bright red flame.
Ba²⁺: Emits a green flame.
Ca²⁺: Emits an orange-red flame.
Cu²⁺: Emits a blue-green flame.
Zn²⁺: Typically does not produce a distinct flame color.
Co²⁺: Emits a blue flame.
Fe²⁺: Emits a yellow-green flame, but this is less distinct and often obscured by other colors.

Metal Ions Producing Characteristic Flames: Sr²⁺, Ba²⁺, Ca²⁺, and Cu²⁺ produce characteristic colors.

Count of Ions Yielding Distinct Flame Colors: Sr²⁺, Ba²⁺, Ca²⁺, Cu²⁺

Therefore, the total number of metal ions from the list that can be characterized by flame tests is: 4

Answer 2

To determine the count of metal ions identifiable by flame test, identify those yielding characteristic flame colors from the provided list.

Analysis of Each Metal Ion:

Sr²⁺: Emits a bright red flame.
Ba²⁺: Emits a green flame.
Ca²⁺: Emits an orange-red flame.
Cu²⁺: Emits a blue-green flame.
Zn²⁺: Typically does not produce a distinct flame color.
Co²⁺: Emits a blue flame.
Fe²⁺: Emits a yellow-green flame, but this is less distinct and often obscured by other colors.

Metal Ions Producing Characteristic Flames: Sr²⁺, Ba²⁺, Ca²⁺, and Cu²⁺ produce characteristic colors.

Count of Ions Yielding Distinct Flame Colors: Sr²⁺, Ba²⁺, Ca²⁺, Cu²⁺

Therefore, the total number of metal ions from the list that can be characterized by flame tests is: 4

Number of metal ions characterized by flame test among the following is _______.
$\text{Sr}^{2+}, \text{Ba}^{2+}, \text{Ca}^{2+}, \text{Cu}^{2+}, \text{Zn}^{2+}, \text{Co}^{2+}, \text{Fe}^{2+}$

Correct Answer: 4

Solution and Explanation

Top Questions on d -and f -Block Elements

Questions Asked in JEE Main exam

Number of metal ions characterized by flame test among the following is _______.$\text{Sr}^{2+}, \text{Ba}^{2+}, \text{Ca}^{2+}, \text{Cu}^{2+}, \text{Zn}^{2+}, \text{Co}^{2+}, \text{Fe}^{2+}$

Correct Answer: 4

Solution and Explanation

Top Questions on d -and f -Block Elements

Questions Asked in JEE Main exam

Number of metal ions characterized by flame test among the following is _______.
$\text{Sr}^{2+}, \text{Ba}^{2+}, \text{Ca}^{2+}, \text{Cu}^{2+}, \text{Zn}^{2+}, \text{Co}^{2+}, \text{Fe}^{2+}$