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Published on: 19/08/2019
The s-Block Elements
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Questions + Answers key
Take MCQ Chemistry Test
1.
Name the three forms of calcium carbonate
2.
What is epsom salt? What is the action of heat on it?
3.
Beryllium and magnesium do not give colour to flame whereas other alkaline earth metals do so. Why?
4.
Which colours are imparted to flame when the following elements are introduced in the flame one by one?
Calcium-Crimson red
5.
Lithium is the only alkali metal that forms nitride directly on reaction with air. Explain.
6.
Explain Lithium does not form alums
7.
A certain salt X gives the results Borax swells up to a glassy mass on strong heating.
Its aqueous solution alkaline to litmus.
8.
What happens when sodium metal is heated in free supply of air ?
9.
What do you mean by diagonal relationship in periodic table?
10.
Which electrolyte is used to obtain sodium in Castner's process?
11.
How would you explain BaO is soluble but BaSO4 is insoluble in water.
12.
Identify A, B, C, and D and give their chemical formulae.
B + NaCl\( \rightarrow\) C + NH4Cl
13.
State Li is the best reducing agent in aqueous solution Why?
14.
Compare four properties of alkali metals and alkaline earth metals
15.
Starting with sodium chloride how would you proceed to prepare? Sodium peroxide.
16.
Dr.Sharma , cardiologist suggested his patienta to take more potassium ions for healthy heart. potassium ions are the most abundant cations within cell fluids, where they activate many enzymes, participate in the oxidation of glucose to pro duse ATP While sodiun ions are responsible for the transmission for nerve signals. What are the sources of potassium ?
17.
Hydrides as well as halides of alkaline earth metals tend to polymerize
Sr
Ca
Be
Mg
18.
The oxide of which of the following metals is amphoteric?
Pb
Mg
Ca
Al
19.
Lithium shows a diagonal relationship with
sodium
silicon
nitrogen
magnesium
20.
The reducing property of alkali metals follows the order
Na < K < Rb < Cs < Li
K < Na < Rb < Cs < Li
Li < Cs < Rb < K < Na
Rb < Cs < K < Na < Li
21.
Which one of the following alkali metals give hydrated salts?
Li
Na
K
Cs
1.
( )
Limestone, chalk, marble.
2.
( )
MgSO4 . 7 H2O;
\(Mg{ SO }_{ 4 }.7{ H }_{ 2 }O\xrightarrow [ 423K ]{ -6{ H }_{ 2 }o } Mg{ SO }_{ 4 }.{ H }_{ 2 }O\)
\(\\ \xrightarrow [ 573k ]{ -{ H }_{ 2 }O } Mg{ SO }_{ 4 }\xrightarrow [ Heat ]{ . } MgO+S{ O }_{ 3 }\)
3.
( )
Be and mg-atoms, due to their small size and high effective nuclear charge, bind their electrons more strongly. Therefore, they require high excitation energy and are not excited by Bunsen flame. While other alkaline earth metals impart a characteristic colour to the flame, due to easy excitation of electrons to higher energy levels.
4.
( )
Calcium-Crimson red
5.
( )
Li+ ion being small in size can easily stablize small nitride ion N3-,however other alkali metal ions because of their larger size cannot stablise smaller nitride ion.Thus,only lithium forms nitride.
6.
Due to small size, lithium does not form alums
7.
Aqueous solution of salt X is alkaline. It indicates that X is the salt of a strong base and a weak acid.
8.
Na2O2 along with small amount of Na2O is formed.
4 Na (s) + O2 (g) \(\longrightarrow \) 2 Na2 O (s)
(minor)
Na2O (s) + \(\frac { 1 }{ 2 } \) O2 (s) \(\longrightarrow \) Na2 O2 (s)
(major)
9.
The resemblance of the first element of second period with diagonally situated element of neighbouring element is called diagonal relationship.
10.
Fused NaOH
11.
Both BaO and BaSO4 are ionic compounds but the hydration energy of BaO is higher than the lattice energy therefore it is soluble in water.
12.
NH4HCO3 + NaCl \( \rightarrow\) NH4Cl + NaHCO3
Thus ,C is sodium bicarbonate
13.
Since, among alkali metals, lithium has the most negative electrode potential (Eo = -3.04 V) so, it is the strongest reducing agent in the aqueous solution.
14.
| Alkali metals | Alkaline earth metals |
| (i) They are soft metals | (i) They are harder than alkali metals |
| (ii) Alkali metals show +1 oxidation state | (ii) Alkaline earth metals show +2 oxidation state |
| (iii) Their carbonates are soluble in water except LiCO3 | (iii) Their carbonates are insoluble in water |
| (iv) Except Li alkali metals do not form complex compounds | (iv) They can form complex compounds |
15.
Sodium peroxide It is obtained by heating sodium metal (Which is obtained ny the electrolysis of molten NaCl), in excess of air. The initially formed sodium oxide reacts with more O2 to form Na2O2.
4Na + O2 \(\xrightarrow{\Delta}\) 2 Na2O2 2Na2O;
2Na2O + O2 + O2\(\xrightarrow{\Delta}\) 2 Na2O2 ;
16.
Kala chana , soya bean and sprouted lentils are the sources of iron potassium and proteins
17.
(c)
Be
18.
(a)
Pb
19.
(d)
magnesium
20.
(a)
Na < K < Rb < Cs < Li
21.
(a)
Li
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