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QJEE MAIN 2022
For kinetic study of the reaction of iodide ion with $\mathrm{H}_2 \mathrm{O}_2$ at room temperature : (A) Always use freshly prepared starch solution. (B) Always...
JEE MainChemistryMedium
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QJEE MAIN 2022
' x ' g of molecular oxygen $\left(\mathrm{O}_2\right)$ is mixed with 200 g of neon $(\mathrm{Ne})$. The total pressure of the non-reactive mixture of $\mathrm{O}_2$...
JEE MainChemistryMedium
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QJEE MAIN 2022
Which of the following methods are not used to refine any metal? (A) Liquation (B) Calcination (C) Electrolysis (D) Leaching (E) Distillation Choose the correct...
JEE MainChemistryEasy
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QJEE MAIN 2022
Consider an imaginary ion ${ }_{22}^{48} \mathrm{X}^{3-}$. The nucleus contains ' a ' $\%$ more neutrons than the number of electrons in the ion. The...
JEE MainChemistryMedium
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QJEE MAIN 2022
If $\alpha, \beta, \gamma, \delta$ are the roots of the equation $x^4+x^3+x^2+x+1=0$, then $\alpha^{2021}+\beta^{2021}+\gamma^{2021}+\delta^{2021}$ is equal to
JEE MainMathematicsEasy
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QJEE MAIN 2022
Statements about Enzyme Inhibitor Drugs are given below : (A) There are Competitive and Non–competitive inhibitor drugs. (B) These can bind at the active sites...
JEE MainChemistryEasy
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QJEE MAIN 2002
When the excited electron of a H atom from n = 5 drops to the ground state, the maximum number of emission lines observed are...
JEE MainChemistryEasy
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QJEE MAIN 2022
The incorrect statement is
JEE MainChemistryEasy
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QJEE MAIN 2022
The total number of functions, $f:\{1,2,3,4\} \cdot\{1,2,3,4,5,6\}$ such that $f(1)+f(2)=f(3)$, is equal to :
JEE MainMathematicsMedium
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QJEE MAIN 2022
For the below given cyclic hemiacetal (X), the correct pyranose structure is :
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