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Hydrogen & S-Block - Class 12 MCQ


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40 Questions MCQ Test - Hydrogen & S-Block

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Hydrogen & S-Block - Question 1

Temporary hardness is caused due to the presence of :    

Detailed Solution for Hydrogen & S-Block - Question 1

Bicarbonates of Ca and Mg are responsible for temporary hardness.

Hydrogen & S-Block - Question 2

Which one is correct for perhydrol?    

Detailed Solution for Hydrogen & S-Block - Question 2

These are characteristics of perhydrol.

Hydrogen & S-Block - Question 3

Which does not react with cold water?    

Detailed Solution for Hydrogen & S-Block - Question 3

SiC is a giant covalent compound

Hydrogen & S-Block - Question 4

H2O2 is prepared in the laboratory when:    

Detailed Solution for Hydrogen & S-Block - Question 4

BaO2 + CO2 + H2O → H2O2 + BaCO3

Hydrogen & S-Block - Question 5

Oxygen can be obtained by heating    

Detailed Solution for Hydrogen & S-Block - Question 5

Hydrogen & S-Block - Question 6

H2O is dipolar whereas BeF2 is not. It is beacuse:    

Detailed Solution for Hydrogen & S-Block - Question 6

BeF2 is linear (sp-hybridization), H2O is angular (sp3-hybridization)

Hydrogen & S-Block - Question 7

The active constituent of bleaching powder is :    

Detailed Solution for Hydrogen & S-Block - Question 7

It is a fact

Hydrogen & S-Block - Question 8

A solid compound ‘X’ on heating gives CO2 gas and a residue. The residue mixed with water forms ‘Y’ on passing an excess of CO2 through ‘Y’ in water, a clear solution ‘Z’ is obtained. On boiling ‘Z’ compound ‘X’ is reformed. The compound ‘X’ is:    

Detailed Solution for Hydrogen & S-Block - Question 8


Hydrogen & S-Block - Question 9

Beryllium shows diagonal relationship with aluminium. Which of the following similaeity is incorrect?    

Detailed Solution for Hydrogen & S-Block - Question 9

Both Be(OH)2 and AI(OH)3 are amphoteric.

Hydrogen & S-Block - Question 10

A metal M readily forms sulphate MSO4 which is water insoluble. It forms oxide MO which becomes inert on heating. It forms insoluble hydroxide which is soluble in NaOH. The metal M is:    

Detailed Solution for Hydrogen & S-Block - Question 10

BeSO4 and MgSO4 are soluble in water. Only BeO is amphoteric and thus reacts with NaOH

Hydrogen & S-Block - Question 11

An inorganic compound liberates O2 when heated, turns an acid solution of KI brown and reduces acidified KMnO4. The substance is:    

Detailed Solution for Hydrogen & S-Block - Question 11

These are the oxidising and reducing properties of H2O2

Hydrogen & S-Block - Question 12

Which statement about zeolite is false?    

Detailed Solution for Hydrogen & S-Block - Question 12

First three choices are characteristics of zeolites.

Hydrogen & S-Block - Question 13

When zeolites, (hydrated sodium aluminium silicate) is treated with hard water, the sodium ions are exchange with :    

Detailed Solution for Hydrogen & S-Block - Question 13

Na2Z + Ca2+ → CaZ + 2Na+

Hydrogen & S-Block - Question 14

The amount of H2O2 present in 1 L of 1.5 N H2O2 solution is:    

Detailed Solution for Hydrogen & S-Block - Question 14

g-eq = V (in L)*N = 1.5 
w = g eq * Meq
= 1.5 * 17 = 25.5g
 

Hydrogen & S-Block - Question 15

Which one of the following statements about water is FALSE?    

Detailed Solution for Hydrogen & S-Block - Question 15

There is extensive intermolecular hydrogen bonding in the condensed phase. Water is amphoteric in nature. Ice formed from D2O sinks in normal water. In photosynthesis CO2 oxidises water in presence of chlorophyll to give O2

Hydrogen & S-Block - Question 16

The principal products obtained on heating iodine with concentrated caustic soda solution are:    

Detailed Solution for Hydrogen & S-Block - Question 16

Hydrogen & S-Block - Question 17

A colourless salt gives violet colour to Bunsen flame and also turns moistured litmus paper blue. It is:    

Detailed Solution for Hydrogen & S-Block - Question 17

Violet colour to flame is characteristic of potassium. Also aqueous solution of K2CO3 is alkaline.

Hydrogen & S-Block - Question 18

NaOH is prepared by the electrolysis of :    

Detailed Solution for Hydrogen & S-Block - Question 18

At anode : 
2CI- → CI2 + 2e
At cathode : 
2H+ + 2e  → H2

Hydrogen & S-Block - Question 19

Which has lowest thermal stability?    

Detailed Solution for Hydrogen & S-Block - Question 19

Li2CO3 decomposes on heating

li2CO3 → Li2O + CO2
 

Hydrogen & S-Block - Question 20

What would you observe if excess of dilute NaOH solution is added and shaken with an aqueous solution of aluminum chloride?    

Detailed Solution for Hydrogen & S-Block - Question 20


Hydrogen & S-Block - Question 21

When sodium metal is dissolved in liquid ammonia, a blue solution is formed. The blue colour is due to:    

Detailed Solution for Hydrogen & S-Block - Question 21


This ammoniated electron is responsible for blue colour of solution, reducing nature and good conductor nature of  solution.

Hydrogen & S-Block - Question 22

Anhydrous mixture of KF and HF contains which type of ions?

Detailed Solution for Hydrogen & S-Block - Question 22

Due to H-bonding

Hydrogen & S-Block - Question 23

Sodium thiosulphate is formed when:    

Detailed Solution for Hydrogen & S-Block - Question 23

Na2S + I2 + Na2SO3 → Na2S2O3  + 2NAl

Hydrogen & S-Block - Question 24

Which statement is false for alkali metals?    

Detailed Solution for Hydrogen & S-Block - Question 24

Na gives crimson yellow colour.

Hydrogen & S-Block - Question 25

Which of the following statement is correct for CsBr3?    

Detailed Solution for Hydrogen & S-Block - Question 25

CsBr3 → Cs++ Br-3

Hydrogen & S-Block - Question 26

The raw materials in Solvay process are:    

Detailed Solution for Hydrogen & S-Block - Question 26

Solvay process is based on electrolysis of brine  (NaCI) solution.

Hydrogen & S-Block - Question 27

An aqueous solution of salt of sodium (NaX) on boiling with MgCI2 gives white precipitate, hence anion X is:

Detailed Solution for Hydrogen & S-Block - Question 27

2NaHCO3 + MgCl2 → MgCO3 + 2Nacl + H2O

Hydrogen & S-Block - Question 28

When magnesium is burnt in air, compounds of magnesium formed are magnesium oxide and:    

Detailed Solution for Hydrogen & S-Block - Question 28

Hydrogen & S-Block - Question 29

Disodium hydrogen phosphate in presence of NH4CI and NH4OH gives a white ppt. with a solution of Mg2+ ion. The precipitate is:    

Detailed Solution for Hydrogen & S-Block - Question 29

It is a method to precipitate Mg2+ ion VI group, of qualitative analysis.

Hydrogen & S-Block - Question 30

If CO2 is passed in excess into lime water, the milkiness first formed disapperars due to:    

Detailed Solution for Hydrogen & S-Block - Question 30


Hydrogen & S-Block - Question 31

A chloride dissolves appreciably in cold water. When placed on a platinum wire in Bunsen flame, no distinctive colour is noticed. Which one is cation?    

Detailed Solution for Hydrogen & S-Block - Question 31

PbCI2 is insoluble in cold water. Mg2+ and Pb2+ do not show flame colour

Hydrogen & S-Block - Question 32

Which alkaline earth metal nitride is volatile?    

Detailed Solution for Hydrogen & S-Block - Question 32

Except Be3N2, rest all are non-volatile nitrides.

Hydrogen & S-Block - Question 33

The correct order of hydration energy of alkaline earth metal ion is:    

Detailed Solution for Hydrogen & S-Block - Question 33

maller is ion, more is hydration energy

Hydrogen & S-Block - Question 34

Beryllium hydride is obtained by:    

Detailed Solution for Hydrogen & S-Block - Question 34

Hydrides of alkaline earth metal (except Be) are obtained by heating them in hydrogen. BeH2 is obtained by:

Hydrogen & S-Block - Question 35

Which reaction shows oxidizing nature of H2O2?

Detailed Solution for Hydrogen & S-Block - Question 35

Hydrogen & S-Block - Question 36

The reaction H2S + H2O2 → S + 2H2O manifests:

Detailed Solution for Hydrogen & S-Block - Question 36

S2- → S0 + 2e

Hydrogen & S-Block - Question 37

The volume of ‘10 vol’ of H2O2 required to liberate 500 mL O2 at NTP is:    

Detailed Solution for Hydrogen & S-Block - Question 37

10 vol. H2O2 means that 1 mL H2O2 gives 10 mL O2; thus, 50 mL H2O2 will give 500 mL O2.

Hydrogen & S-Block - Question 38

Which hydride is an ionic hydride?    

Detailed Solution for Hydrogen & S-Block - Question 38

It is a property of hydrogen in which it resemble with halogen, Alkali metal hydrides are ionic in nature.

Hydrogen & S-Block - Question 39

H2O2 restores the colour of old lead paintings, blackened by the action of H2S gas, by:    

Detailed Solution for Hydrogen & S-Block - Question 39

PbS + 4H2O2 → PbSO4 + 4H2O

Hydrogen & S-Block - Question 40

Some statements about heavy water are given below:    
(i)    Heavy water is used as a moderator in nuclear reactors    (ii)    Heavy water is more associated than ordinary water    (iii)    Heavy water is more effective solvent than ordinary water    
Which of the above statements are correct?    

Detailed Solution for Hydrogen & S-Block - Question 40

These are facts

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