s-Block Elements

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

Ionic mobility of which of the following alkali metal ions is lowest when aqueous solution of their salts are put under an electric field?

1. K+
2. Rb+
3. Li+
4. Na+

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.

The product obtained as a result of a reaction of nitrogen with CaC2 is

1. CaCN2
2. Ca2CN
3. Ca(CN)2
4. CaCN

The suspension of slaked lime in water is known as

1. lime water
2. quick lime
3. milk of lime
4. aqueous solution of slaked lime.

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

The function of "Sodium pump" is a biological process operating in each and every cell of all animals. Which of the following biologically important ions is also a constituent of this pump?

1. K+
2. Fe2+
3. Ca2+
4. Mg2+