s-Block Elements

Reaction of Br2 with Na2CO3 in aqueous solution gives sodium bromide and sodium bromate with evolution of CO2 gas. The number of sodium bromide molecules involved in the balanced chemical equation is ________.

The compound(s) formed upon combustion of sodium metal in excess air is (are)

Aqueous solutions of Na\(_2\)S\(_2\)O\(_3\) on reaction with Cl\(_2\) gives:

Statement-1 : Alkali metals dissolves in liquid ammonia to give blue solutions
Statement-2 : Alkali metals in liquid ammonia give solvated species of the type \(\left[\mathrm{M}\left(\mathrm{NH}_{3}\right)_{n}\right]^{+} (\mathrm{M}=\) alka...

The question contains STATEMENT - 1 (Assertion) and STATEMENT - 2 (Reason) and has 4 choices (a), (b), (c) and (d) out of which ONLY ONE is correct.
STATEMENT - 1 Alkali metals dissolve in liquid ammonia to give blue solutions. because
STAT...

MgSO4 on reaction with NH4OH and Na2HPO4 forms a white crystalline precipitate. What is its formula?

A sodium salt on treatment with MgCl3 gives white precipitate only on heating. The anion of the sodium salt is

The set representing the correct order of first ionization potential is

Give reasons of the following:
BeCl2 can be easily hydrolysed.

Work out the following using chemical equation :
Chlorination of calcium hydroxide produces bleaching powder.

Highly pure dilute solution of sodium in liquid ammonia

Give reasons of the following:
The crystalline salts of alkaline earth metals contain more water of crystallisation than the corresponding alkali metal salts.

Arrange the following sulphates of Alkaline earth metals in order of decreasing thermal stability : BeSO4, MgSO4, CaSO4, SrSO4

Element A burns in nitrogen to give an ionic compound B. Compound B reacts with water to give C and D. A solution of C becomes 'milky' on bubbling carbon dioxide. Identify A, B, C and D.

The following compounds have been arranged in order of their increasing thermal stabilities. Identify the correct order
K2CO3 (A), MgCO3 (B), CaCO3 (C), BeCO3 (D)

Explain the difference in the nature of bonding in LiF and LiI.

Complete and balance the following reactions:
Ca5(PO4)3F + H2SO4 + H2O \(\buildrel {Heat} \over \longrightarrow\) ........ + 5CaSO4.2H2O + ........

Statement (S) The alkali metals can form ionic hydrides which contain the hydride ion H-.
Explanation (E) The alkali metals have low electronegativity; their hydrides conduct electricity when fused and liberate hydrogen at the anode.

Ca2+ has a small ionic radius than K+ because it has ______.

The species that do not contain peroxide ions are

Write down the balanced equation for the reaction when:
Carbon dioxide is passed through a suspension of lime stone in water.

When zeolite, which is hydrated sodium aluminium silicate is treated with hard water the sodium ions are exchanged with

Write down the balanced equation for the reaction when:
Potassium ferricyanide reacts with hydrogen peroxide in basic solution

The electrolysis of molten sodium hydride liberates ____ gas at the _____

Write down the balanced equation for the reaction when:
Carbon dioxide is passed through a concentrated aqueous solution of sodium chloride saturated with ammonia.

Sodium when burnt in excess of oxygen gives sodium oxide.

The metallic lustre exhibited by sodium is explained by

Give reasons of the following :
Magnesium oxide is used for the lining of steel making furnace.

The pair of compound which cannot exist together in solution is:

The softness of group I-A metals increases down the group with increasing atomic number.

Molecular formula of Glauber's salt is:

Write down the balanced equations for the reaction when:
Calcium phosphate is heated with a mixture of sand and carbon;

Sodium dissolved in liquid ammonia conducts electricity because ________.

The oxide that gives hydrogen peroxide on treatment with a dilute acid is

The hydration energy of Mg++ is larger than that of:

How will you prepare bleaching powder from slaked lime.

MgCl2.6H2O on heating give anhydrous MgCl2

Write down the balanced equations for the reaction when:
An alkaline solution of potassium ferricyanide is reacted with hydrogen peroxide.

Give reasons of the following:
Sodium carbonate is made by Solvay process but the same process is not extended to the manufacture of potassium carbonate.

A solution of sodium metal in liquid ammonia is strongly reducing due to the presence of

Anhydrous MgCl2 is obtained by hydrated salt with ______.

HCL is added to the following oxides. Which one would give H2O2?

Calcium is obtained by

The substance absorbs CO2 and violently reacts with water. The substance is