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InterviewSolution
This section includes InterviewSolutions, each offering curated multiple-choice questions to sharpen your knowledge and support exam preparation. Choose a topic below to get started.
| 101. |
`H_(2)O_(2)` will oxidiseA. `KMnO_(4)`B. `PbS`C. `MnO_(2)`D. `KCl` |
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Answer» Correct Answer - B |
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| 102. |
Why does `H^(+)` ion always get associated with atoms or molecules ?A. Ionisation enthalpy of hydrogen resembles that of alkali metalB. Its reactivity is similar to halogensC. It resembles both alkli metals and halogensD. Loss of an electron from hydrogen atom results in a nucleus of very small size as compared to other atoms or ions, due to small size it connot exist free. |
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Answer» Correct Answer - D |
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| 103. |
The dihedral angle in gaseous `H_(2)O_(2)` isA. `101.5^(@)`B. `90^(@)`C. `111.5^(@)`D. `109^(@)28^(1)` |
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Answer» Correct Answer - C |
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| 104. |
What is the dihedral angle between two `H` atoms of `H_(2)O_(2)`?A. `100^(@)`B. `90^(@)`C. `109^(@)28^(1)`D. `180^(@)` |
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Answer» Correct Answer - B |
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| 105. |
(I). `H_(2)O_(2)` is non- linear compound (II) In `H_(2)O_(2)` , the hydroxyl group are not in same plane (III) The dihedral angle in `H_(2)O_(2)` in its vapour phase is `90^(@)` (IV) `H_(2)O_(2)` is planer molecule. then the correct statement (s) is/are:A. I and IV onlyB. I and II onlyC. III and IV onlyD. I,II,III,and Iv |
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Answer» Correct Answer - B |
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| 106. |
`H_(2)O_(2)` acts as antiseptic due to itsA. Reducing propertyB. Oxidizing propertyC. Bleaching propertyD. Acidic property |
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Answer» Correct Answer - B |
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| 107. |
`H_(2)O_(2)` changes aquesous KI solution toA. HIB. `I_(2)`C. `KI_(3)`D. `H_(2)` |
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Answer» Correct Answer - B |
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| 108. |
Very pure hydrogen `(99.9%)` can be made by which of the following processes ?A. Mixing natural hydrocarbons of high molecular weightB. Electrolysis of waterC. Reaction of salt like hydrides with waterD. Reaction o methane with water |
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Answer» Correct Answer - B |
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| 109. |
Crystals of 100% `H_(2)O_(2)` is obtained by cooling 90% `H_(2)_O_(2)` withA. Solid `Co_(2)` and etherB. dil.`H_(2)SO_(4)`C. Quick limeD. `NaOH+CaO` |
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Answer» Correct Answer - A |
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| 110. |
There are three samples of `H_(2)O_(2)` labelled as `10 vol,15 vol,20 vol`. Half liter of each sample are mixed and then diluted with equal volume of water. Calculate the volume strength of resultant solution.A. 7.5B. 1.339C. 5.6D. 15 |
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Answer» Correct Answer - A |
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| 111. |
When water is dropped over sodium peroxide, the colorless gas produced isA. Di NitrogenB. Di HydrogenC. Di oxygenD. `H_(2)O_(2)` |
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Answer» Correct Answer - A |
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| 112. |
A bottle of `H_(2)O_(2)` is labelled as 10 vol `H_(2)O_(2)`. 112 " mL of " this solution of `H_(2)O_(2)` is titrated against 0.04 M acidified solution of `KMnO_(4)` the volume of `KMnO_(4)` in litre is |
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Answer» Correct Answer - 1 |
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| 113. |
Which of the following statements about `H_(2)O_(2)` is not true ?A. `H_(2)O_(2)` is used to clean oil paintingsB. `H_(2)O_(2)` acts as oxidising as well as reducing agentC. Two hydroxyl group in `H_(2)O_(2)` lie in the same planeD. It retains same structural in liquid and solid form |
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Answer» Correct Answer - A::B::D |
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| 114. |
`H_(2)O_(2)` is "5.6 volume" thenA. It is 1.7% weight by vollumeB. It is 1 NC. It is 1 MD. It is 5.6 M |
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Answer» Correct Answer - A::B |
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| 115. |
The mass number of the element obtained when tritium undergoes `beta` - decay is `"__"` |
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Answer» Correct Answer - 3 |
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| 116. |
Which of the following substances cause permanent hardness of waterA. `CaCl_(2)`B. `Ca(HCO_(3))_(2)`C. `CaCO_(3)`D. All of these |
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Answer» Correct Answer - A |
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| 117. |
Calgon (a water softener) is :A. `Na_(2)[Na_(4)(PO_(3))_(6)]`B. `Na_(4)[Na_(2)(PO_(3))_(6)]`C. `Na_(4)[Na_(2)(PO_(3))_(3)]`D. `Na_(2)[Na_(4)(PO_(3))_(4)]` |
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Answer» Correct Answer - A |
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| 118. |
Which compound is used for the manufacture of chemicals like sodium perborate and per-carbonate which are used in high quality detrgents.A. `H_(2)S`B. `H_(2)O_(2)`C. `D_(2)O`D. `NaOH` |
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Answer» Correct Answer - B |
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| 119. |
The composition of electrolyte for the manufacture of calcium by electrolytic method isA. Can.`H_(2)SO_(4)`B. Fused alkaliC. 50%`H_(2)SO_(4)`D. 50% `aq.NaOH` |
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Answer» Correct Answer - C |
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| 120. |
What is formed when calcium carbide reacts with heavy water?A. AcetyleneB. Calcium hydroxide C. DeuteriumD. Deutero acetylene |
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Answer» Correct Answer - D |
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| 121. |
Chemical A is used for water softening to remove temporary hardness. A reacts with sodium carbonate to generate caustic soda. When `CO_(2)` is bubbled through a solution of A, it turns cloudy. What is the chemical formula of A ?A. `CaCO_(3)`B. CaOC. `Ca(OH)_(2)`D. `Ca(HCO_(3))_(2)` |
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Answer» Correct Answer - C |
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| 122. |
Density of heavy water is maximum atA. `3.82^(@)C`B. `101.42^(@)C`C. `11.6^(@)C`D. `4^(@)C` |
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Answer» Correct Answer - C |
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| 123. |
The numbers of protons, electrons and neutrons in a molecule of heavy water are respectivelyA. `_(1)H^(1),_(8)O^(16)B. `_(1)H^(2),_(8)O^(18)C. `_(1)H^(2),_(8)O^(16)D. `_(1)H^(1),_(8)O^(18)` |
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Answer» Correct Answer - C |
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| 124. |
Hydrolith, a source of Hydrogen isA. `NaH`B. `CuH_(2)`C. `LiH`D. `BaH_(2)` |
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Answer» Correct Answer - B |
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| 125. |
Di-hydrogen reduces CuO toA. `Cu_(2)O`B. `CuH_(2)`C. `(CuH_(2))`D. `Cu` |
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Answer» Correct Answer - D |
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| 126. |
Which one of the following statement is incorrectA. Dihydrogen is the most abundant element in the universe.B. Dihydrogen is the principal element in the solar atmosphere.C. `H_(2)` is much less abundant in the earth crust.D. `H_(2)` does not occur in plant and animal tissues |
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Answer» Correct Answer - B |
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| 127. |
Which of the following reaction produces hydrogen ?A. Mg+SteamB. `BaO_(2)+HCl`C. `H_(2)S_(4)O_(8)+H_(2)O`D. `Na_(2)O_(2)+2HCl` |
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Answer» Correct Answer - A |
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| 128. |
The ionuzation enregy of hydrogen isA. Greater then inert gasesB. Nearer to intert gasesC. Nearer to HalogensD. Nearer to alkaline earth metals |
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Answer» Correct Answer - C |
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| 129. |
Which one of the following statement is incorrectA. Hydrogen forms more compounds than any other elementB. H-has one electron short in comparison with octet configurationC. The ionization enthalpy of H is 1312kJ/molD. Hydrogen is less reactive when compared with halogens |
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Answer» Correct Answer - B |
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| 130. |
Why can dilute solutions of hydrogen peroxide not be concentrated by heating? How can a conentrated solution of hydrogen peroxide be obtanied ?A. About 99% pureB. About 90% pureC. 30% pureD. About 50%pure |
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Answer» Correct Answer - B |
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| 131. |
Hydrogen peroxide isA. DiamagneticB. ParamagneticC. FerromagneticD. Ferri magnetic |
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Answer» Correct Answer - A |
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| 132. |
Eloctrolysis of 50% `H_(2)SO_(2)` producesA. `H_(2)S_(2)O_(8)` at anodeB. `H_(2)SO_(4)` at anodeC. `H_(2)SO_(5)` at cathodeD. `H_(2)O_(2)` at anode |
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Answer» Correct Answer - A |
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| 133. |
During the electrolysis of 50% `H_(2)SO_(4)`, the `p^(H)` of the solutionA. IncreasesB. DecreasesC. Becomes zeroD. Remains constant |
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Answer» Correct Answer - A |
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| 134. |
At one time `H_(2)O_(2)` was obtained by electrolysis of 50% `H_(2)SO_(4)` The process of electrolysis involves following reaction : `2H_(2)SO_(4) rarr 2H^(+)+2HSO_(4)^(-)` At cathode: `2H^(+)+2e^(-) rarr H_(2)uarr` At anode: `2HSO_(4)^(-)rarr X+2e^(-)` `X+H_(2)O rarr Y+Z, Y+H_(2)Orarr Z+H_(2)O_(2)` The number of -OH groups in X:A. 3B. 2C. 4D. zero |
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Answer» Correct Answer - B |
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| 135. |
What is the Normality of a commercial sample `H_(2)O_(2)` of the `16.8V`? |
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Answer» Correct Answer - 3 |
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| 136. |
`25mL` samples of distiled water, tap water and boiled water required, respectively, `1mL, 13mL` and `5mL` of soap solution to form a permanent lather. The ratio of temporary to permanent hardness in the tap water is |
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Answer» Correct Answer - A |
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| 137. |
How many grams of barium hydride must be treated with water to obtain 4.36L of hydrogen at `20^(@)C` and 0.975 atm pressure (Ba=137)?A. `24.56g`B. `34.56g`C. `42.65g`D. `43.65g` |
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Answer» Correct Answer - A |
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| 138. |
How many grams of barium hydride must be treated with water to obtain 4.36L of hydrogen at `20^(@)C` and 0.975 atm pressure (Ba=137)?A. `12.28g`B. `24.56g`C. `16.14g`D. 14.56g` |
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Answer» Correct Answer - A |
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| 139. |
Which of the following could act as a propellant for rockets ?A. `Liq.H_(2)+Liq.O_(2)`B. `Liq.N_(2)+Liq.O_(2)`C. `Liq.H_(2)+Liq.O_(2)`D. `Liq.O_(2)+Liq.Ar_(2)` |
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Answer» Correct Answer - A |
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| 140. |
`CaCl_(2) + Na_(2) CO_(3) rarr 2NaCl + CaCO_(3)` `CaSO_(4) + Na_(2)CO_(3) rarr CaCO_(3) + Na_(2)SO_(4)` If hardness is 100 ppm amount of `Na_(2)CO_(3)` required to soften 10 lt. Of hard water isA. `2.12` gmB. `0.10` gmC. `10.6` gmD. `1.06` gm |
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Answer» Correct Answer - D |
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| 141. |
100mLOf top water containg `Ca(HCO_(3))_(2)`was titrated with 30mL if HCl were required calculate the tempporrary harness as parts of `CaCO_(3)` per `10^(6)` parts of water .A. 300ppmB. 150ppmC. 100pmD. 600ppm |
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Answer» Correct Answer - A |
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| 142. |
20mL of `H_(2)O_(2)` after acidification with dilute `H_(2)SO_(4)` required 30mL of N/12 `KMnO_(4)` for complete oxidation. Calculate the percentage of `H_(2)O_(2)` in the solution. Equivalent mass of `H_(2)O_(2)=17`.A. `10.75g/lit`B. `11.75 g/lit`C. `12.75 g/lit`D. `13.75 g/lit` |
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Answer» Correct Answer - C |
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| 143. |
Which of the following exists as polymeric chain in the solid state?A. `CaH_(2)`B. `CuH_(2)`C. `BaH_(2)`D. `SrH_(2)` |
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Answer» Correct Answer - B |
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| 144. |
The process used for the removal of hardness of water isA. BaeyerB. CalgonC. SerpeckD. Hoope |
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Answer» Correct Answer - B |
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| 145. |
The hardness of water due to `HCO_3` is `122 p p m`. Select the correct statement(s).A. The hardness of water in terms of `CaCO_(3)` is 200 ppmB. The hardness of water in terms of `CaCO_(3)` is 100 ppmC. The hardness of water in terms of `CaCO_(3)` is 222 ppmD. The hardness of water in terms of `CaCO_(3)` is 95 ppm |
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Answer» Correct Answer - B::D |
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| 146. |
Whichh of the following is correct about heavy water ?A. Water at `4^(@)C` having maximum density is known as heavy waterB. It is heavier then water `(H_(2)O)`C. It is formed by the combination of isotope of hydrogen and oxygenD. None of the above |
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Answer» Correct Answer - B |
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| 147. |
How many moles of ammonia are produced when one mole of calcium nitride reacts with water? |
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Answer» Correct Answer - 2 |
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| 148. |
In `H_(2)O_(2)` molecule the O-O bond length is (in gas phase)A. `1.34A^(@)`B. `1.48A^(@)`C. `1.54A^(@)`D. `1.20A^(@)` |
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Answer» Correct Answer - B |
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| 149. |
The volume strength of `1*5` N `H_(2)O_(2)` solution isA. `8.4 VolB. 4.2 VolC. 16.8 VolD. 5.2 Vol |
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Answer» Correct Answer - A |
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| 150. |
Hydrogen peroxide in its reaction with `KIO_(4)` and `NH_(2)OH` respectively, is acting as aA. reducing agent, oxidising agentB. reducing agent , reducing agentC. ioxidising agent ,oxidising agentD. oxidising agent , reducing agent |
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Answer» Correct Answer - A |
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