1
JEE Main 2024 (Online) 30th January Evening Shift
Numerical
+4
-1
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Number of metal ions characterized by flame test among the following is ________.

$$\mathrm{Sr}^{2+}, \mathrm{Ba}^{2+}, \mathrm{Ca}^{2+}, \mathrm{Cu}^{2+}, \mathrm{Zn}^{2+}, \mathrm{Co}^{2+}, \mathrm{Fe}^{2+}$$

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2
JEE Main 2024 (Online) 27th January Evening Shift
Numerical
+4
-1
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Total number of ions from the following with noble gas configuration is _________.

$$\mathrm{Sr}^{2+}(z=38), \mathrm{Cs}^{+}(z=55), \mathrm{La}^{2+}(z=57), \mathrm{Pb}^{2+}(z=82), \mathrm{Yb}^{2+}(z=70)$$ and $$\mathrm{Fe}^{2+}(z=26)$$

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3
JEE Main 2023 (Online) 15th April Morning Shift
Numerical
+4
-1
Change Language
In Chromyl chloride, the oxidation state of chromium is $(+)$ _______________.
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4
JEE Main 2023 (Online) 15th April Morning Shift
Numerical
+4
-1
Change Language
The total change in the oxidation state of manganese involved in the reaction of $\mathrm{KMnO}_{4}$ and potassium iodide in the acidic medium is ____________.
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