s-Block Elements · Question 40

Given below are two statements : one is labelled as Assertion (A) and the other is labelled as Reason (R). In the light of the above statements, choose the correct answer from the options given below :

1. Both A and R are true but R is NOT the correct explanation of A.
2. A is true but R is false
3. A is false but R is true
4. Both A and R are true and R is the correct explanation of A.

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.

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