1
NEET 2025
MCQ (Single Correct Answer)
+4
-1
Change Language

Which among the following electronic configurations belong to main group elements?

A. $[\mathrm{Ne}] 3 \mathrm{~s}^1$

B. $[\operatorname{Ar}] 3 \mathrm{~d}^3 4 \mathrm{~s}^2$

C. $[K r] 4 d^{10} 5 s^2 5 p^5$

D. $[\operatorname{Ar}] 3 \mathrm{~d}^{10} 4 \mathrm{~s}^1$

E. $[R n] 5 f^0 6 d^2 7 s^2$

Choose the correct answer from the option given below :

A
D and E only
B
A, C and D only
C
B and E only
D
A and C only
2
NEET 2025
MCQ (Single Correct Answer)
+4
-1
Change Language

Which one of the following compounds can exist as cis-trans isomers?

A
1, 1-Dimethylcyclopropane
B
1, 2-Dimethylcyclohexane
C
Pent-1-ene
D
2-Methylhex-2-ene
3
NEET 2025
MCQ (Single Correct Answer)
+4
-1
Change Language

Phosphoric acid ionizes in three steps with their ionization constant values $K_{a_1}, K_{a_2}$ and $K_{a_3}$, respectively, while $K$ is the overall ionization constant. Which of the following statements are true?

A. $\quad \log \mathrm{K}=\log \mathrm{K}_{\mathrm{a}_1}+\log \mathrm{K}_{\mathrm{a}_2}+\log \mathrm{K}_{\mathrm{a}_3}$

B. $\mathrm{H}_3 \mathrm{PO}_4$ is a stronger acid than $\mathrm{H}_2 \mathrm{PO}_4^{-}$and $\mathrm{HPO}_4^{2-}$

C. $K_{a_1}>K_{a_2}>K_{a_3}$

D. $K_{a_1}=\frac{K_{a_3}+K_{a_2}}{2}$

Choose the correct answer from the options given below :

A
B, C and D only
B
A, B and C only
C
A and B only
D
A and C only
4
NEET 2025
MCQ (Single Correct Answer)
+4
-1
Change Language

Match List-I with List-II

List - I
(Ion)
List - II
(Group Number in Cation Analysis)
A $\mathrm{Co}^{2+}$ I Group-I
B $\mathrm{Mg}^{2+}$ II Group-III
C $\mathrm{Pb}^{2+}$ III Group-IV
D $\mathrm{Al}^{3+}$ IV Group-VI

Choose the correct answer from the options given below :

A
A-III, B-II, C-IV, D-I
B
A-III, B-II, C-I, D-IV
C
A-III, B-IV, C-II, D-I
D
A-III, B-IV, C-I, D-II
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