S Block Elements

Q.

What is the role of calcium in muscle contraction?

Q. The major component/ingredient of Portland Cement is :

1. Tricalcium aluminate
2. Dicalcium silicate
3. Dicalcium aluminate
4. Tricalcium silicate

Q.

A substance X, which is an oxide of a group $2$ element, is used intensively in the cement industry. This element is present in bones also. On treatment with water, it forms a solution which turns red litmus blue. Identify X and also write the chemical reactions involved.

Q.

The right order of the solubility of sulphates of alkaline earth metals in water is

1. Be > Ca > Mg > Ba > Sr

2. Mg > Be > Ba > Ca > Sr

3. Mg > Ca > Ba > Be > Sr

4. Be > Mg > Ca > Sr > Ba

Q. What is the oxidation number of sulphur in h2so4.

Q. What is " reducing nature' of alkali metal , with respect to standard electrode potential ??

Q.

What is the difference between alkali metals and alkali earth metals?

Q.

Which of the following is the electronic configuration of cerium?

1. 4f⁰5d²6s²

2. 4f¹5d¹6s²

3. 4f²5d²6s⁰

4. 4f²5d⁰6s²

Q.

The alkali metals form salt-like hydrides by the direct synthesis at elevated temperature. The thermal stability of these hydrides decreases in which of the following orders?

1. CsH > RbH > KH > NaH > LiH

2. NaH > LiH > KH > RbH > CsH

3. LiH > NaH > KH > RbH > CsH

4. KH > NaH > LiH > CsH > RbH

Q. Which of the following oxidation states are the most characteristics for lead and tin respectively?

1. +4, +2
2. +2, +4
3. +4, +4
4. +2, +2

Q. Which of the following metal halide has the highest ionic character?
(Here, $M$ is monovalent metal)

1. $MI$
2. $MCl$
3. $MBr$
4. $MF$

Q.

The metal mainly used in devising photoelectric cells is:

1. Li

2. Cs

3. Rb

4. Na

Q. Why is Oxidation state in amalgams is zero for Hg?

Q.

What is oxidation state of Scandium?

Q. Which of the following has magnesium?

1. Chlorophyll
2. Haemocyanin
3. Carbonic Anhydrase
4. Vitamin $B_{12}$

Q.

Are sulfides soluble?

Q. Which of the following configuration corresponds to an alkaline earth metal

1. 
2. 
3. 
4. 

Q.

Which of the following salt gives a crimson red colour in flame test?

1. ${\mathrm{BaCl}}_2$

2. ${\mathrm{CaCl}}_2$

3. ${\mathrm{BeCl}}_2$

4. ${\mathrm{SrCl}}_2$

Q.

The first ionization energy of the d-block elements are?

1. Lesser than p-block elements

2. Between s and p-block elements

3. Higher than p-block elements

4. Lesser than s-block elements

Q. 1.05 grams of metal carbonate on heating gives 0.5 grams of metal oxide. What will be the equivalent weight of the metal and metal carbonate?

Q. Valence shell electronic configuration of Barium is:

1. $5s^2$
2. $6s^2$
3. $5s^1$
4. $6s^1$

Q.

The inert gases have electronic configuration of:

1. ns²

2. ns²np⁶

3. ns²np²

4. ns²np³

Q.

Alkaline earth metals include elements.

Q.

Arrange the following:

(a). Element of group 1, in increasing order of their reactivity.

(b). Element of group 17, in decreasing order of their reactivity.

(c). He, Na, Mg (increasing order of their melting point)

(d). Chlorine, Sodium, and Magnesium (in increasing order of their reducing character)

Q. Name : two colourless metal ions

Q. Oxidation no. Of CuH

Q. why Boron has very low electrical conductivity, while aluminium of the same group is bigot conductive?

Q. Give reasons :

(a) $E^{\circ }$ value for $M{n}^{3+}/M{n}^{2+}$ couple is much more positive than that for $F{e}^{3+}/F{e}^{2+}.$

(b) Iron has higher enthalpy of atomization than that of copper.

(c) $S{c}^{3+}$ is colourless in aqueous solution whereas $T{i}^{3+}$ is coloured.

Q. Which of the following orders is wrong?

1. $ZnO$ is amphoteric oxide
2. $Li<Be<B<CI{E}_1$
3. $A{l}_2{O}_3<MgO<N{a}_{2}O<K_{2}O\text{Basic}$
4. $L{i}^{+}<N{a}^{+}<K^{+}<C{s}^{+}\text{Ionic radius}$

Q.

Which one of the following is a weak acid?

1. Perchloric acid

2. Hydrochloric acid

3. Nitric acid

4. Hydrogen fluoride