s-Block Elements · Question 2

Identify the incorrect statement from the following

1. Alkali metals react with water to form their hydroxides.
2. The oxidation number of K in KO2 is +4.
3. Ionisation enthalpy of alkali metals decreases from top to bottom in the group.
4. Lithium is the strongest reducing agent among the alkali metals.

Match List - I with List - II Choose the correct answer from the options given below :

1. (a)-(iv), (b)-(i), (c)-(iii), (d)-(ii)
2. (a)-(iii), (b)-(iv), (c)-(ii), (d)-(i)
3. (a)-(i), (b)-(iii), (c)-(iv), (d)-(ii)
4. (a)-(ii), (b)-(iii), (c)-(i), (d)-(iv)

CaCl2 and Ca(OCl)2 are components of

1. Lime water
2. Gypsum
3. Portland cement
4. Bleaching powder

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

The following metal ion activates many enzymes, participates in the oxidation of glucose to produce ATP and with Na+, is responsible for the transmission of nerve signals.

1. Copper
2. Calcium
3. Potassium
4. Iron

HCl was passed through a solution of CaCl2, MgCl2 and NaCl. Which of the following compound(s) crystallize(s)?

1. Only NaCl
2. Only MgCl2
3. NaCl, MgCl2 and CaCl2
4. Both MgCl2 and CaCl2

Which of the following is an amphoteric hydroxide?

1. Mg(OH)2
2. Be(OH)2
3. Sr(OH)2
4. Ca(OH)2

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