s-Block Elements

Which one of the following statements is correct?

1. All enzymes that utilise ATP in phosphate transfer require Ca as the cofactor.
2. The bone in human body is an inert and unchanging substance.
3. Mg plays roles in neuromuscular function and interneuronal transmission.
4. The daily requirement of Mg and Ca in the human body is estimated to be 0.2-0.3 g.

Among the following alkaline earth metal halides, one which is covalent and soluble in organic solvents is :

1. Beryllium chloride
2. Calcium chloride
3. Strontium chloride
4. Magnesium chloride

The structures of beryllium chloride in solid state and vapour phase, are :

1. Chain in both
2. Chain and dimer, respectively
3. Linear in both
4. Dimer and Linear, respectively

Enzymes that utilize ATP in phosphate transfer require an alkaline earth metal (M) as the cofactor. M is

1. Ca
2. Sr
3. Be
4. Mg

Which of the following oxides is most acidic in nature?

1. MgO
2. BeO
3. BaO
4. CaO

Magnesium reacts with an element (X) to form an ionic compound. If the ground state electronic configuration of (X) is 1s2 2s2 2p3, the simplest formula for this compound is

1. Mg2X3
2. MgX2
3. Mg2X
4. Mg3X2

Which of the following statements is false?

1. Ca2+ ions are not important in maintaining the regular beating of the heart.
2. Mg2+ ions are important in the green parts of the plants.
3. Mg2+ ions form a complex with ATP.
4. Ca2+ ions are important in blood clotting.

In context with beryllium, which one of the following statements is incorrect?

1. It is rendered passive by nitric acid.
2. It forms Be2C
3. Its salts rarely hydrolyze.
4. Its hydride is electron-deficient and polymeric.

On heating which of the following releases CO2 most easily?

1. Na2CO3
2. MgCO3
3. CaCO3
4. K2CO3

Solubility of the alkaline earth metal sulphates in water decreases in the sequence

1. Sr > Ca > Mg > Ba
2. Ba > Mg > Sr > Ca
3. Mg > Ca > Sr > Ba
4. Ca > Sr > Ba > Mg

Which of the following alkaline earth metal sulphates has hydration enthalpy higher than the lattice enthalpy?

1. CaSO4
2. BeSO4
3. BaSO4
4. SrSO4

Property of the alkaline earth metals that increases with their atomic number

1. solubility of their hydroxides in water
2. solubility of their sulphates in water
3. ionization energy
4. electronegativity

Which one of the following compounds is a peroxide?

1. KO2
2. BaO2
3. MnO2
4. NO2

The correct order of increasing thermal stability of K2CO3, MgCO3, CaCO3 and BeCO3 is

1. BeCO3 < MgCO3 < CaCO3 < K2CO3
2. MgCO3 < BeCO3 < CaCO3 < K2CO3
3. K2CO3 < MgCO3 < CaCO3 < BeCO3
4. BeCO3 < MgCO3 < K2CO3 < CaCO3

In which of the following the hydration energy is higher than the lattice energy?

1. MgSO4
2. RaSO4
3. SrSO4
4. BaSO4

Mg is present in

1. chlorophyll
2. haemoglobin
3. vitamin-D
4. vitamin-B