1
JEE Main 2023 (Online) 13th April Morning Shift
MCQ (Single Correct Answer)
+4
-1
Change Language

The energy of an electron in the first Bohr orbit of hydrogen atom is $$-2.18 \times 10^{-18} \mathrm{~J}$$. Its energy in the third Bohr orbit is ____________.

A
One third of this value
B
Three times of this value
C
$$\frac{1}{9}$$ th of this value
D
$$\frac{1}{27}$$ of this value
2
JEE Main 2023 (Online) 13th April Morning Shift
MCQ (Single Correct Answer)
+4
-1
Out of Syllabus
Change Language

$$\mathrm{Be}(\mathrm{OH})_{2}$$ reacts with $$\mathrm{Sr}(\mathrm{OH})_{2}$$ to yield an ionic salt.

Choose the incorrect option related to this reaction from the following :

A
Be is tetrahedrally coordinated in the ionic salt.
B
The element $$\mathrm{Be}$$ is present in the cationic part of the ionic salt.
C
Both $$\mathrm{Sr}$$ and $$\mathrm{Be}$$ elements are present in the ionic salt.
D
The reaction is an example of acid - base neutralization reaction.
3
JEE Main 2023 (Online) 13th April Morning Shift
MCQ (Single Correct Answer)
+4
-1
Out of Syllabus
Change Language

Given below are two statements :

Statement I : Permutit process is more efficient compared to the synthetic resin method for the softening of water.

Statement II : Synthetic resin method results in the formation of soluble sodium salts.

In the light of the above statements, choose the most appropriate answer from the options given below:

A
Statement I is correct but Statement II is incorrect
B
Both the Statements I and II are correct
C
Both the Statements I and II are incorrect
D
Statement I is incorrect but Statement II is correct
4
JEE Main 2023 (Online) 13th April Morning Shift
Numerical
+4
-1
Change Language

$$\mathrm{KMnO}_{4}$$ is titrated with ferrous ammonium sulphate hexahydrate in presence of dilute $$\mathrm{H}_{2} \mathrm{SO}_{4}$$. Number of water molecules produced for 2 molecules of $$\mathrm{KMnO}_{4}$$ is ___________.

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