s-Block Element...

Divalent magnesium and calcium ions are found in large proportions in biological fluids. They help in

The alkali metals and their salts impart characteristic colour to an oxidizing flame because:

What is the oxidation state of K in KO2?

Arrange the following metals in decreasing order of their hydration enthalpy:

Li, Rb, Na, K, Cs

Among the alkali metals the most abundant are:

To a clear solution of a compound (X), a solution of barium chloride (BaCl₂) is added to give a white precipitate which does not dissolve in dilute HCl. The compound (X) is

One of the following is the rarest of all alkaline earth metals

The correct order of increasing lattice energy of the metallic compounds is

An alkali metal which exists in the liquid state at (or near) room temperature is

Which of the following metal ions plays an important role in muscle contraction?

Calcium carbide on hydrolysis forms

A chemical compound 'A' is used for water softening to remove temporary hardness. 'A' reacts with Na₂CO₃ to form caustic soda. A substance B is the cause of temporary hardness and is removed as C. Then, A, B and C respectively are

Which of the following is not an ore of magnesium?

Directions: The following question has four choices out of which ONLY ONE is correct.

Which of the following statements is/are NOT true regarding alkali metal oxides?

Which of the following compounds is/are formed when lithium is heated in air?

The affinity of sodium with water is used in drying of

Which of the following oxides is not expected to react with sodium hydroxide?

Initial setting of cement is mainly due to

H₂O is dipolar whereas BeF₂ is not. It is because

The general electronic configuration of alkali metals is

The general electronic configuration of ns² exists in:

The alkali metals burn vigorously in oxygen forming oxides. Hence, potassium forms

Directions: The following question has four choices out of which ONLY ONE is correct.

The molecular formula of Glauber's salt is

Directions: The following question has four choices out of which ONLY ONE is correct.

NaOH solution is soapy to touch because

Flame photometry is used to determine the concentration of the

Which of the following statements is false in case of alkali metals?

A mixture of MgCl₂ and MgO is called

he electronic configuration of Rn7s¹ belongs to

Which of the following alkaline earth metals will give grassy green colour in flame?

Bleaching powder contains a salt of an oxoacid as one of its components. The anhydride of that oxoacid is