NEET 2025 | s-Block Elements Question 1 | Chemistry

This chapter is currently out of syllabus

NEET 2025

MCQ (Single Correct Answer)

-1

Which one of the following reactions does NOT belong to "Lassaigne's test"?

$\mathrm{Na}+\mathrm{X} \xrightarrow[\Delta]{ }+\mathrm{NaX}$

$2 \mathrm{CuO}+\mathrm{C} \xrightarrow[\Delta]{ } 2 \mathrm{Cu}+\mathrm{CO}_2$

$\mathrm{Na}+\mathrm{C}+\mathrm{N} \underset{\Delta}{\longrightarrow} \mathrm{NaCN}$

$2 \mathrm{Na}+\mathrm{S} \underset{\Delta}{\longrightarrow} \mathrm{Na}_2 \mathrm{~S}$

NEET 2023 Manipur

MCQ (Single Correct Answer)

-1

Out of Syllabus

Given below are two statements : one is labelled as Assertion (A) and the other is labelled as Reason (R).

Assertion (A) : Lithium and beryllium unlike their other respective group members form compounds with pronounced ionic character.

Reason (R) : Lithium and Magnesium have similar properties due to diagonal relationship.

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

(A) is true but (R) is false.

(A) is false but (R) is true.

Both (A) and (R) are true and (R) is the correct explanation of (A).

Both (A) and (R) are true but (R) is not the correct explanation of (A).

NEET 2023

MCQ (Single Correct Answer)

-1

Out of Syllabus

Given below are two statements : one is labelled as Assertion $$\mathbf{A}$$ and the other is labelled as Reason $$\mathbf{R}$$ :

Assertion A : Metallic sodium dissolves in liquid ammonia giving a deep blue solution, which is paramagnetic.

Reason R : The deep blue solution is due to the formation of amide.

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

Both $$\mathbf{A}$$ and $$\mathbf{R}$$ are true but $$\mathbf{R}$$ is NOT the correct explanation of $$\mathbf{A}$$.

$$\mathbf{A}$$ is true but $$\mathbf{R}$$ is false

$$\mathbf{A}$$ is false but $$\mathbf{R}$$ is true

Both $$\mathbf{A}$$ and $$\mathbf{R}$$ are true and $$\mathbf{R}$$ is the correct explanation of $$\mathbf{A}$$.

NEET 2023

MCQ (Single Correct Answer)

-1

Out of Syllabus

Which one of the following statements is correct?

All enzymes that utilise ATP in phosphate transfer require $$\mathrm{Ca}$$ as the cofactor.

The bone in human body is an inert and unchanging substance.

$$\mathrm{Mg}$$ plays roles in neuromuscular function and interneuronal transmission.

The daily requirement of $$\mathrm{Mg}$$ and $$\mathrm{Ca}$$ in the human body is estimated to be 0.2 - 0.3 $$\mathrm{g}$$.

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