Blackened oil planting can be restored into original form by the action of:

1. Chlorine

2. BaO2

3. H2O2

4. MnO2

Concept Questions :-

Di-Hydrogen,type and isotopes
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Which of the following statement regarding H2O2 is wrong.

(A) It is stable in acid medium

(B) It acts as oxidising as well as reducing agent

(C) It has zero dipole moment

(D) Pure H2O2 is slightly acidic

Concept Questions :-

H2O2 (Hydrogen Peroxide)
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Polyphosphates are used as water softening agents because they –

(A) form soluble complexes with anionic species

(B) precipitate anionic species

(C) form soluble complexes with cationic species

(D) precipitate cationic species

Concept Questions :-

Hard & Soft Water
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Which of the following is correct for hydrogen –

(A) It can form bonds in +1 as well as –1 oxidation state

(B) It is always collected at cathode

(C) It has a very high ionization potential

(D) It has same electronegativity as halogens

Concept Questions :-

Preparation & Properties
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Permanent hardness of water can be removed, by adding –

(A) Sodalime

(B) Sodiumbicarbonate

(C) Washing soda

(D) Sodium chloride

Concept Questions :-

Hard & Soft Water
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The correct increasing order of the acidity of CO2, H2O and H2O2 is -

(A) CO2<H2O2<H2O                         

(B) H2O<H2O2<CO2

(C) H2O<H2O2>CO2                         

(D) H2O2>CO2>H2O

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At absolute zero.

(A) Only para hydrogen exists

(B) Only ortho hydrogen exists

(C) Both para and ortho hydrogen exist

(D) None of these

Concept Questions :-

Di-Hydrogen,type and isotopes
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Metal which does not react with cold water but evolves H2 with steam is –

(A) Na                           

(B) K

(C) Pt                             

(D) Fe

Concept Questions :-

Preparation & Properties
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The oxidation states of the most electronegative element in the products of the reaction, BaO2 with dil. H2SO4 are–

(A) 0 and – 1                                   

(B) –1 and –2

(C) –2 and 0                                     

(D) –2 and + 1

Concept Questions :-

H2O2 (Hydrogen Peroxide)
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Hardness of water is due to presence of salts of –

(A) Na+ and K+                                  

(B) Ca2+ and Mg2+

(C) Ca2+ and K+                                 

(D) Ca2+ and Na+

Concept Questions :-

Hard & Soft Water
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