s-Block Elements

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

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+

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

In Castner-Kellner cell for production of sodium hydroxide

1. brine is electrolyzed using graphite electrodes
2. molten sodium chloride is electrolysed
3. sodium amalgam is formed at mercury cathode
4. brine is electrolyzed with Pt electrodes

Which one of the alkali metals, forms only, the normal oxide, M2O on heating in air?

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

The ease of adsorption of the hydrated alkali metal ions on an ion-exchange resin follows the order :

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

Which of the following statements is incorrect?

1. Pure sodium metal dissolves in liquid ammonia to give blue solution.
2. NaOH reacts with glass to give sodium silicate.
3. Aluminium reacts with excess NaOH to give Al(OH)3.
4. NaHCO3 on heating gives Na2CO3.

Match List-I with List-II for the compositions of substances and select the correct answer using the codes given below.

1. (A)-(iii), (B)-(iv), (C)-(i), (D)-(ii)
2. (A)-(ii), (B)-(iii), (C)-(iv), (D)-(i)
3. (A)-(i), (B)-(ii), (C)-(iii), (D)-(iv)
4. (A)-(iv), (B)-(iii), (C)-(ii), (D)-(i)

Which one of the following is present as an active ingredient in bleaching powder for bleaching action?

1. CaOCl2
2. Ca(OCl)2
3. CaO2Cl
4. CaCl2

The compound A on heating gives a colourless gas and a residue that is dissolved in water to obtain B. Excess of CO2 is bubbled through aqueous solution of B, C is formed which is recovered in the solid form. Solid C on gentle heating gives back A. The compound is

1. CaCO3
2. Na2CO3
3. K2CO3
4. CaSO4 2H2O

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