The s-Block Elements Test

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The s-Block Elements Test - 1

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Question 1
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Among the alkali metals the most abundant are:

A
rubidium and lithium

B
rubidium and potassium

C
Sodium and lithium

D
sodium and potassium

Solution

Explanation:

Na and K are highly abundant. Constituting 2.5 and 2.4 percent of the Earth's crust respectively the othwe alkali metals are considerably rare.
Question 2
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One of the following is the rarest of all alkaline earth metals

A
Barium

B
Radium

C
Strontium

D
Beryllium

Solution

Explanation:

Ra is found in Uranium and thorium ores in trace amounts as small as a seventh of a gram per ton of uraninite so it is rarest of all alkaline earth metals
Question 3
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Divalent magnesium and calcium ions are found in large proportions in biological fluids.

A
maintenance of ion balance

B
maintenance of peristalsis

C
maintenance of cardiac rhythm

D
maintenance of pulse rate

Solution

Explanation:

Mg2+ and Ca2+ maintains the ion balance.
Question 4
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Monovalent sodium and potassium ions found in large proportions in biological fluids. They help in

A
maintenance of pulse rate

B
maintenance of cardiac rhythm

C
maintenance of nerve impulse conduction

D
maintenance of peristalsis

Solution

Explanation:

Na and K ions help in transmission of nerve impulses , in regulating the flow of water accross the cell membranes and in the transport of sugar and amino acids in to cells. so monovalent sodium and potassium ions found in large proportions in biological fluids
Question 5
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The diagonal relationship exists between

A
Beryllium and magnesium

B
Lithium and magnesium

C
Lithium and aluminium

D
Lithium and beryllium

Solution

Explanation:

Lithium shows diagonal relationship to Magnisium due to their nearly same polarising power, comparable electronegativities(Li=1.00, Mg=1.20) and small difference in radius (Li=152Pm, Mg=159pm).
Question 6
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One of the following is highly radioactive

A
Rubidium

B
Francium

C
Caesium

D
Lithium

Solution

Explanation:

Fr is highly radioactive metal, that decays in to astatine,,radium and radon , it is also highly unstable element found only in trace amount on earth.
Question 7
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Sodium and potassium belong to the category of

A
noble gases

B
alkali metals.

C
alkaline earth metals.

D
transition elements

Solution

Explanation:

Na and K are shiny, soft ,highly reactive metal at standard temprature and pressure and electronic configaration of Na & K is ns^2,,compounds of Na & K are available most aboundenty in nature so thees two are alkali metal.
Question 8
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Calcium and Magnesium belong to the category of

A
Alkaline earth metals.

B
alkali metals.

C
coordination compounds

D
transition elements

Solution

Explanation:

calcium and megnesium are 2^nd group element of periodic table which are obtaine on earth in the form ore, their oxides and hydroxide are alkaline in nature so they are alkaline earth metals
Question 9
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One of the following is not called alkaline earth metal.

A
beryllium

B
radium

C
barium

D
Strontium
Solution
Explanation:

Alkaline earth metals are called so because of two reasons
1. Alkaline earth metals are obtained on earth in the form of ores
2. Oxides and hydroxides of Alkaline earth metals are basic in nature,
However Beryllium fulfills 1st reason but its oxides and hydroxides are amphoteric so sometimes they say it is not alkaline earth metal. but as it is amphoteric IUPAC has accepted this as alkaline earth metal
Question 10
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Group IlA of the periodic table consists of the six elements are collectively known as

A
transition elements

B
alkaline earth metals.

C
alkali metals.

D
noble gases

Solution

Explanation:

because their oxide and hydroxide are alkaline in nature and these metal oxide are found in earth's crust

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The s-Block Elements Test - 1

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Question 1

rubidium and lithium

rubidium and potassium

Sodium and lithium

sodium and potassium

Solution

Question 2

Barium

Radium

Strontium

Beryllium

Solution

Question 3

maintenance of ion balance

maintenance of peristalsis

maintenance of cardiac rhythm

maintenance of pulse rate

Solution

Question 4

maintenance of pulse rate

maintenance of cardiac rhythm

maintenance of nerve impulse conduction

maintenance of peristalsis

Solution

Question 5

Beryllium and magnesium

Lithium and magnesium

Lithium and aluminium

Lithium and beryllium

Solution

Question 6

Rubidium

Francium

Caesium

Lithium

Solution

Question 7

noble gases

alkali metals.

alkaline earth metals.

transition elements

Solution

Question 8

Alkaline earth metals.

alkali metals.

coordination compounds

transition elements

Solution

Question 9

beryllium

radium

barium

Strontium

Solution

Question 10

transition elements

alkaline earth metals.

alkali metals.

noble gases

Solution

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