JEE Main 2023 (Online) 24th January Morning Shift | s-Block Elements Question 37 | Chemistry

Reaction of BeO with ammonia and hydrogen fluoride gives A which on thermal decomposition gives $$\mathrm{BeF_2}$$ and $$\mathrm{NH_4F}$$. What is 'A'?

$$\mathrm{(NH_4)Be_2F_5}$$

$$\mathrm{(NH_4)_2BeF_4}$$

$$\mathrm{(NH_4)BeF_3}$$

$$\mathrm{H_3NBeF_3}$$

JEE Main 2022 (Online) 29th July Evening Shift

MCQ (Single Correct Answer)

-1

Out of Syllabus

Portland cement contains 'X' to enhance the setting time. What is 'X'?

$$\mathrm{CaSO}_{4} \cdot \frac{1}{2} \mathrm{H}_{2} \mathrm{O}$$

$$\mathrm{CaSO}_{4} \cdot 2 \mathrm{H}_{2} \mathrm{O}$$

$$\mathrm{CaSO}_{4}$$

$$\mathrm{CaCO}_{3}$$

JEE Main 2022 (Online) 29th July Morning Shift

MCQ (Single Correct Answer)

-1

Out of Syllabus

Lithium nitrate and sodium nitrate, when heated separately, respectively, give :

$$\mathrm{LiNO}_{2}$$ and $$\mathrm{NaNO}_{2}$$

$$\mathrm{Li}_{2} \mathrm{O}$$ and $$\mathrm{Na}_{2} \mathrm{O}$$

$$\mathrm{Li}_{2} \mathrm{O}$$ and $$\mathrm{NaNO}_{2}$$

$$\mathrm{LiNO}_{2}$$ and $$\mathrm{Na}_{2} \mathrm{O}$$

JEE Main 2022 (Online) 28th July Evening Shift

MCQ (Single Correct Answer)

-1

Out of Syllabus

The correct decreasing order for metallic character is :

Na > Mg > Be > Si > P

P > Si > Be > Mg > Na

Si > P > Be > Na > Mg

Be > Na > Mg > Si > P

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