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Test: The s-Block Elements - 2


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30 Questions MCQ Test Chemistry Class 11 | Test: The s-Block Elements - 2

Test: The s-Block Elements - 2 for NEET 2022 is part of Chemistry Class 11 preparation. The Test: The s-Block Elements - 2 questions and answers have been prepared according to the NEET exam syllabus.The Test: The s-Block Elements - 2 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 - 2 below.
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Test: The s-Block Elements - 2 - Question 1

Cs+ ions impart violet to Bunsen flame. This is due to the fact that the emitted radiations are of

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

Emmited wavelength lies in visible region

Blue has high frequency low wavelength -high energy

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

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 - 2 - Question 2

Be2+ →  Al3+ + Be2+ is diagonaly similar with Al3+ & Al3+ is amphoteric in nature.

Test: The s-Block Elements - 2 - Question 3

An alkaline earth metal (M) gives a salt with chlorine, which is soluble in water at room temperature. It also forms an insoluble sulphate whose mixture with a sulphide of a transition metal is called `lithopone'-a white pigment. Metal M is-

Detailed Solution for Test: The s-Block Elements - 2 - Question 3

Lithopane is (BaSO4 + ZnS)
white pigment
BaSO4 is insoluble in water

Test: The s-Block Elements - 2 - Question 4

The reaction of an element A with water produces combustible gas B and an aqueous solution of C. When another substance D reacts with this solution C also produces the same gas B.D also produces the same gas even on reaction with dilute H2SO4 at room temperature. Element A imparts golden yellow colour to Bunsen flame. Then A,B,C and D may be identified as

Detailed Solution for Test: The s-Block Elements - 2 - Question 4


Zn + NaOH → Na2ZnO2 + H2
Amphoteric
Nz + dil H2SO4 → ZnSO4 + H2

Test: The s-Block Elements - 2 - Question 5

The hydroxide of alkaline earth metal, which has the lowest value of solubility product (Ksp) at normal temperature (25°C) is-

Detailed Solution for Test: The s-Block Elements - 2 - Question 5

Be(OH)2 down the group solubility increase

Test: The s-Block Elements - 2 - Question 6

(Yellow ppt) T  X  Y. (Yellow ppt) + Z­ (pungent smellinggas)

If X gives green flame test. Then, X is :

Detailed Solution for Test: The s-Block Elements - 2 - Question 6

Green flame is given by Ba2+

BaS2O3+K2CrO4 → BaCrO4+K2S2O3   yellow ppt

Test: The s-Block Elements - 2 - Question 7

Which of the following carbonate of alkali metals has the least thermal stability ?

Detailed Solution for Test: The s-Block Elements - 2 - Question 7

T.S ∞ Ionic character (for polyatomic anion)
Li2CO3 is least ionic or most covalent

Test: The s-Block Elements - 2 - Question 8

The `milk of magnesia' used as an antacid is chemicaly -

Detailed Solution for Test: The s-Block Elements - 2 - Question 8

Mg(OH)2
Base or Antacid which distroys and as per neutralisation reaction

Test: The s-Block Elements - 2 - Question 9

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 - 2 - Question 9

K2O,    KO2,  K2O2
Rb2O,   RbO2,   Rb2O2
Na, Li from normal oxide

Test: The s-Block Elements - 2 - Question 10

The pair of compounds, which cannot exist together in a solution is-

Detailed Solution for Test: The s-Block Elements - 2 - Question 10

NaHCO3 + NaOH   Na2CO3 + H2O


Acidic  Base hydrogen

Test: The s-Block Elements - 2 - Question 11

The formula of soda ash is

Detailed Solution for Test: The s-Block Elements - 2 - Question 11

Soda ash is Na2CO3.

Test: The s-Block Elements - 2 - Question 12

The hydration energy of Mg2+ is -?

Detailed Solution for Test: The s-Block Elements - 2 - Question 12

Hydration energy ∞ polarising power
Na+ < Mg2+ < Mg3+ < Be3+ < Al3+

Test: The s-Block Elements - 2 - Question 13

The golden yellow colour associated with NaCl to Bunsen flame can be explained on the basis of -

Detailed Solution for Test: The s-Block Elements - 2 - Question 13

In frame test thermal excitation deexcitation takes place in cation with low Ionisation potential

Test: The s-Block Elements - 2 - Question 14

Solution of sodium metal in liquid ammonia is a strong reducing agent due to presence of -?

Detailed Solution for Test: The s-Block Elements - 2 - Question 14

Test: The s-Block Elements - 2 - Question 15

The order of solubility of lithium halides in non polar solvents follows the order.

Detailed Solution for Test: The s-Block Elements - 2 - Question 15

As the size of the anion increases from  to , the covalent character increase and hence the solubility in non-polar solvent increases. 

Test: The s-Block Elements - 2 - Question 16

The salt which finds uses in qualitative inorganic analysis is -?

Detailed Solution for Test: The s-Block Elements - 2 - Question 16

Microcosinic salt is used in microcosmicbed test

Test: The s-Block Elements - 2 - Question 17

Fire extinguishers contain -?

Detailed Solution for Test: The s-Block Elements - 2 - Question 17

NaHCO3 + H2SO4 →  Na2SO4 + H2O + CO2
extingusher fire

Test: The s-Block Elements - 2 - Question 18

CsBr3 contains -?

Detailed Solution for Test: The s-Block Elements - 2 - Question 18

Cs is highly electropositive & forms ionic bond with Cs+ cation.

Test: The s-Block Elements - 2 - Question 19

Alkali metals reacts with water vigorously to form hydroxides and dihydrogen. Which of the following alkali metals reacts with water least vigorously?

Detailed Solution for Test: The s-Block Elements - 2 - Question 19

Na + Al2O3 → Na2O + Al (Position in electrochemical series)
Na2O + CO2 → Na2CO3

Test: The s-Block Elements - 2 - Question 20

The correct order of second ionisation potentials (IP) of Ca, Ba and K is -

Detailed Solution for Test: The s-Block Elements - 2 - Question 20

K [Ar] 4s1 →  second ionisation is extremely difficult.
Ca [Ar] 4s2
Ba  [Xe] 5S2

Test: The s-Block Elements - 2 - Question 21

EDTA is used in the estimation of - ?

Detailed Solution for Test: The s-Block Elements - 2 - Question 21

Test: The s-Block Elements - 2 - Question 22

aq. NaOH + P4 (white) → PH3 + X; compound X is

Detailed Solution for Test: The s-Block Elements - 2 - Question 22

Test: The s-Block Elements - 2 - Question 23

The correct order of solubility is -?

Detailed Solution for Test: The s-Block Elements - 2 - Question 23

Evident from Fajan rule

Test: The s-Block Elements - 2 - Question 24

The complex formation tendency of alkaline earth metals decreases down the group because -

Detailed Solution for Test: The s-Block Elements - 2 - Question 24

Down the group Zeff decrease & complex farmation tendeny decrease

Test: The s-Block Elements - 2 - Question 25

The alkaline earth metals, which do not impart any colour to Bunsen flame are -

Detailed Solution for Test: The s-Block Elements - 2 - Question 25

Be & Mg due to small size does not impart colour to the flame as excitation & deexcitation is not possible.

Test: The s-Block Elements - 2 - Question 26

The alkali metals are low melting. Which of the following alkali metal is expected to melt if the room temperature rises to 30°C?

Detailed Solution for Test: The s-Block Elements - 2 - Question 26

(d) Among alkali metals, melting point decreases as the strength of metallic bonding decreases with increasing size of the atom. Thus, Cs has the lowest melting point (28.5°C) and will melt at 30°C.

Test: The s-Block Elements - 2 - Question 27

A metal M readily forms water soluble sulphate, and water insoluble hydroxide M(OH)2. Its oxide MO is amphoteric, hard and having high melting point. The alkaline earth metal M must be -

Detailed Solution for Test: The s-Block Elements - 2 - Question 27

BeO is amphoteric due to its diogional similarly with Al

Test: The s-Block Elements - 2 - Question 28

When K2O is added to water, the solution becomes basic in nature because it contains a significant concentration of -

Detailed Solution for Test: The s-Block Elements - 2 - Question 28

K2O + H2O → KOH

Test: The s-Block Elements - 2 - Question 29

If A is the metallic salt, then the white ppt. of D must be of -?

Detailed Solution for Test: The s-Block Elements - 2 - Question 29


Test: The s-Block Elements - 2 - Question 30

(Mily Cloud) 

The chemical formulae of A and B are -?

Detailed Solution for Test: The s-Block Elements - 2 - Question 30


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