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Test: The s-Block Elements - 1


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25 Questions MCQ Test Chemistry Class 11 | Test: The s-Block Elements - 1

Test: The s-Block Elements - 1 for NEET 2022 is part of Chemistry Class 11 preparation. The Test: The s-Block Elements - 1 questions and answers have been prepared according to the NEET exam syllabus.The Test: The s-Block Elements - 1 MCQs are made for NEET 2022 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Test: The s-Block Elements - 1 below.
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Test: The s-Block Elements - 1 - Question 1

Sodium and potassium belong to the category of

Detailed Solution for Test: The s-Block Elements - 1 - Question 1

Na and K have ns1 configuration so they are alkali metal.

Test: The s-Block Elements - 1 - Question 2

What is the oxidation state of K in KO2?

Detailed Solution for Test: The s-Block Elements - 1 - Question 2

Here KO2 is in superoxide form hence O.S. of O is -1/2 for each oxygen atom. Hence 2*1/2= 1, therefore k has +1 O.S.

Test: The s-Block Elements - 1 - Question 3

Potassium ions are the most abundant cations. They:

Detailed Solution for Test: The s-Block Elements - 1 - Question 3

Potassium ions are the most abundant cations. They participate in the oxidation of glucose to produce ATP

Test: The s-Block Elements - 1 - Question 4

Metal carbonates decompose on heating to give metal oxide and carbondioxide. Which of the metal carbonates is most stable thermally?

Detailed Solution for Test: The s-Block Elements - 1 - Question 4

BaCO3 is very stable due to size compatability factor . A larger cation can stablises a larger anion.

Test: The s-Block Elements - 1 - Question 5

Dehydration of hydrates of halides of calcium, barium and strontium i.e.,   can be achieved by heating. These become wet on keeping in air. Which of the following statements is correct about these halides?

Detailed Solution for Test: The s-Block Elements - 1 - Question 5

All of these statements are coorect as these halides absorb water and due to decrease in the hydration energy down the group tendency to from hydrates decreases.

Test: The s-Block Elements - 1 - Question 6

One of the following is highly radioactive

Detailed Solution for Test: The s-Block Elements - 1 - Question 6

Fr is radioactive.

Test: The s-Block Elements - 1 - Question 7

2M +2H2O → 2M+ + 2OH+ H2   

What is M ?

Detailed Solution for Test: The s-Block Elements - 1 - Question 7

M is alkali metal.

Test: The s-Block Elements - 1 - Question 8

To acquire noble gas configuration, alkaline earth metals lose

Detailed Solution for Test: The s-Block Elements - 1 - Question 8

Alkaline Earth Metals loses 2 electron to attain noble gas configuration.

Test: The s-Block Elements - 1 - Question 9

The diagonal relationship exists between

Detailed Solution for Test: The s-Block Elements - 1 - Question 9

1st element of 1st group and the second element of 2nd group exist in diagonal relationship.

Hence C is the correct answer.

Test: The s-Block Elements - 1 - Question 10

Choose the correct statements from the following.

Detailed Solution for Test: The s-Block Elements - 1 - Question 10

The correct answer is Option B
Be is not readily attacked by acids due to formation of oxide layer.
The surface of beryllium metal is covered with a thin layer of oxide that helps protect the metal from attack by air. It does not oxidize in air even at 600oC. 
2Be+O2⟶2BeO

Test: The s-Block Elements - 1 - Question 11

Which one of the following orders presents the correct sequence of the increasing basic nature of the given oxides? 

Detailed Solution for Test: The s-Block Elements - 1 - Question 11

While moving from left to right in periodic table basic character of oxide of elements will decrease. ∴→Increasing basic strength Al2O3<MgO<Na2O    and while descending in the group basic character of corresponding oxides increases.  ∴→Increasing basic strength Na2O<K2O   ∴ Correct Order is Al2O3 < MgO <Na2O <K2O

Test: The s-Block Elements - 1 - Question 12

Lithium has most negative E0 value,its reaction with water is less vigorous than that of sodium which has the least negative E0 value among the alkali metals. The reason is

Detailed Solution for Test: The s-Block Elements - 1 - Question 12

Li due its small size have high Lattice energy value which compensates its high ionization energy so has most negative E0 value

Test: The s-Block Elements - 1 - Question 13

Alkaline earth metals show large size of the atoms. Therefore, they have

Detailed Solution for Test: The s-Block Elements - 1 - Question 13

The low ionisation enthalpies of the alkaline earth metals is because of their strong tendency to lose electrons due to their smaller nuclear charge and comparatively larger atomic size which results in weaker forces of attraction between the valence electrons and the nucleus.

Test: The s-Block Elements - 1 - Question 14

Metals form basic hydroxides. Which of the following metal hydroxide is the least basic?

Detailed Solution for Test: The s-Block Elements - 1 - Question 14

Due to small size of Mg. Mg-O become more stronger hence tendency of OH to leave decreases thus basic character decreases.

Test: The s-Block Elements - 1 - Question 15

Several sodium compounds find use in industries. Which of the following ompounds are used for textile industry?

Detailed Solution for Test: The s-Block Elements - 1 - Question 15

Na2CO3 is used in textile industry.

Test: The s-Block Elements - 1 - Question 16

Monovalent sodium and potassium ions found in large proportions in biological fluids. They help in

Detailed Solution for Test: The s-Block Elements - 1 - Question 16

Na and K ions help in transmission of nerve impulses.

Test: The s-Block Elements - 1 - Question 17

When sodium is dissolved in liquid ammonia, a solution of deep blue colour is obtained. The colour of the solution is due to

Detailed Solution for Test: The s-Block Elements - 1 - Question 17

The color of solution is due to the presence of ammoniated electron.

Test: The s-Block Elements - 1 - Question 18

Choose the correct order of increase in electropositivity of alkali earth metals in the options given below

Detailed Solution for Test: The s-Block Elements - 1 - Question 18

Correct Answer : a

Explanation : Atomic no. of Be, Mg, Ca, Sr, Ba are 4, 12,20,38,56 respectively.

On moving down the group, the effective nuclear charge on the outermost electrons decreases. Hence Ba can readily lose electrons and will be the most electropositive element among the alkaline earth metals.

Test: The s-Block Elements - 1 - Question 19

Some of the Group 2 metal halides are covalent and soluble in organic solvents. Among the following metal halides, the one which is soluble in ethanol is

Detailed Solution for Test: The s-Block Elements - 1 - Question 19

BeCl2 is soluble in ethanol. Except for beryllium halides, all other halides of alkaline earth metals are ionic in nature. Beryllium halides are essentially covalent and soluble in organic solvents.

Test: The s-Block Elements - 1 - Question 20

Which of the following compounds are readily soluble in water?

Detailed Solution for Test: The s-Block Elements - 1 - Question 20

BeSO4 being unstable is readily soluble in water. Aslo hydration energy of Be is high due to small size.

Test: The s-Block Elements - 1 - Question 21

Divalent magnesium and calcium ions are found in large proportions in biological fluids.

Detailed Solution for Test: The s-Block Elements - 1 - Question 21

Mg2+ and Ca2+ maintains the ion balance.

Test: The s-Block Elements - 1 - Question 22

The alkali metals dissolve in liquid ammonia giving deep blue solutions. When they become diamagnetic, the solution turns into

Detailed Solution for Test: The s-Block Elements - 1 - Question 22

When the solution become diamagnetic color changes to bronze.

Test: The s-Block Elements - 1 - Question 23

Radium salts are used in

Detailed Solution for Test: The s-Block Elements - 1 - Question 23

Ra salts are used in the treatment of Cancer.

Test: The s-Block Elements - 1 - Question 24

The solubility of metal halides depends on their nature, lattice enthalpy and hydration enthalpy of the individual ions. Amongst fluorides of alkali metals,the lowest solubility of LiF in water is due to

Detailed Solution for Test: The s-Block Elements - 1 - Question 24

LiF has very high lattice energy which cannot be compensated by Hydration Energy.

Test: The s-Block Elements - 1 - Question 25

Which of the following are the correct reasons for anomalous behaviour of lithium?

Detailed Solution for Test: The s-Block Elements - 1 - Question 25

Exceptionally small size of Li is responsible for its anamolous behavior.

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