JEE Mains · Chemistry · STD 11 - 8.2 Organic chemistry isomerism

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

A 4
B 6
C 8
D 10

Verified Solution

Answer & Solution

Correct Answer

(A) 4

Step-by-step Solution

Detailed explanation

All the following metal ions will respond to flame test. \(Sr ^{2+}, Ba ^{2+}, Ca ^{2+}, Cu ^{2+}\)

Apply the relevant identity from the chapter and substitute the values established in the previous step, keeping the original constraint in view.

Use the simplified expression to isolate the unknown, then plug the result back into the question setup to confirm the working is internally consistent.

Cross-check against a boundary or limiting case. Both the dimensional balance and the qualitative behaviour at the extreme should agree with the candidate answer.

Combine the steps above to identify the correct option. The remaining choices each fail at least one of the consistency, dimensional, or boundary checks.

Same subject

Match the catalysis (Column\(-I\) ) with products (Column \(-II\) )

Column \(-I\) Catalyst	Column \(-II\) >Product
\((a)\) \(V_2O_5\)	\((i)\) Polyethylene
\((b)\) \(TiCl_4/Al(Me)_3\)	\((ii)\) Ethanal
\((c)\) \(PdCl_2\)	\((iii)\) \(H_2SO_4\)
\((d)\) Iron oxide	\((iv)\) \(NH_3\)

JEE Mains 2019 Hard

The vapour pressures of pure liquids \(A\) and \(B\) are \(400\) and \(600\, mm\, Hg\), respectively at \(298\, K\). On mixing the two liquids, the sum of their initial volumes is equal to the volume of the final mixture. The mole fraction of liquid \(B\) is \(0.5\) in the mixture. The vapour pressure of the final solution, the mole fractions of components \(A\) and \(B\) in vapour phase, respectively are

JEE Mains 2019 Hard

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

Step-by-step Solution

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