Hydrogen & s-Block Elements JEE Main PYQs, 2020 to 2023

JEE Main 2023 · 15 Apr · Shift 1 · Anomalous Behaviour of Li and Be

1. (A)$\mathrm{(A)}$ is true but $(\mathrm{R})$ is false
2. (B)Both (A) and $(\mathrm{R})$ are true and $(\mathrm{R})$ is the correct explanation of $(A)$
3. (C)(A) is false but (R) is true
4. (D)Both (A) and (R) are true but (R) is NOT the correct explanation of (A)

Answer: (C)

JEE Main 2023 · 13 Apr · Shift 2 · Alkaline Earth Metals

1. (A)$$\mathrm{BeH}_{2}+\mathrm{F}_{2} \stackrel{\Delta}{\longrightarrow} \mathrm{BeF}_{2}$$
2. (B)$$\left(\mathrm{NH}_{4}\right)_{2} \mathrm{BeF}_{4} \stackrel{\Delta}{\longrightarrow} \mathrm{BeF}_{2}$$
3. (C)$\mathrm{Be}+\mathrm{F}_{2} \stackrel{\Delta}{\longrightarrow} \mathrm{BeF}_{2}$
4. (D)$$\mathrm{BeO}+\mathrm{C}+\mathrm{F}_{2} \stackrel{\Delta}{\longrightarrow} \mathrm{BeF}_{2}$$

Answer: (B)

JEE Main 2023 · 13 Apr · Shift 2 · Hydrogen and Hydrides

1. (A)A is not correct but R is correct
2. (B)Both A and R are correct but R is NOT the correct explanation of A
3. (C)A is correct but R is not correct
4. (D)Both A and R are correct and R is the correct explanation of A

Answer: (D)

JEE Main 2023 · 12 Apr · Shift 1 · Alkali Metals

1. (A)$\mathrm{Na}<\mathrm{K}<\mathrm{Cs}<\mathrm{Rb}$
2. (B)$\mathrm{K}<\mathrm{Na}<\mathrm{Rb}<\mathrm{Cs}$
3. (C)$\mathrm{K}<\mathrm{Cs}<\mathrm{Na}<\mathrm{Rb}$
4. (D)$\mathrm{Na}<\mathrm{Rb}<\mathrm{K}<\mathrm{Cs}$

Answer: (B)

JEE Main 2023 · 8 Apr · Shift 2 · Hydrogen Peroxide

1. (A)Urea
2. (B)Glass containers
3. (C)Alkali
4. (D)Dust

Answer: (A)