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

Reaction of \( \mathrm{BeCl_2} \) with \( \mathrm{LiAlH_4} \) gives:
(A) \( \mathrm{AlCl_3} \) (B) \( \mathrm{BeH_2} \) (C) \( \mathrm{LiH} \) (D) \( \mathrm{LiCl} \) (E) \( \mathrm{BeAlH_4} \)
Choose the correct answer from options given below:

Statement I: An alloy of lithium and magnesium is used to make aircraft plates.
Statement II: The magnesium ions are important for cell-membrane integrity.
In the light the above statements, choose the correct answer from the options given below:

The correct order of density is:

s-Block element which cannot be qualitatively confirmed by the flame test is:

The correct order of melting point is:

Given below are two statements:
Statement I: The chlorides of Be and Al have Cl-bridged structure. Both are soluble in organic solvents and act as Lewis bases.
Statement II: Hydroxides of Be and Al dissolve in excess alkali to give beryllate and aluminate ions
In the light of the above statements, choose the correct answer from the options given below:

Choose the correct order of density of the alkali metals:

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

Amongst baking soda, caustic soda and washing soda, carbonate anion is present in:

Match List – I with List – II.

Choose the most appropriate answer from the options given below:

Which of the following statement is incorrect?

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JEE Main 2022 29th July Evening shift

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