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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.
| 501. |
Explain the use of hydrogen in the formation of vegetable fats. |
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Answer» Hydrogen is employed for the conversion of polyunsaturated vegetable iols like soyabean, cotton seeds into vegetable fats like dalda, gagan etc. `underset("Liquid")("Vegetable oil")+H_(2)underset(473K)overset(Ni)to underset("Solid")("Fat")` The reaction occurs in the presence of nickel catalyst and at a temperature of 473K. |
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| 502. |
The nuclei of tritium `(H^(3))` atom would contain neutrons :A. 1B. 2C. 3D. 4 |
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Answer» Correct Answer - B Number of neutroons = Mass number-Atomic number =3-1=2. |
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| 503. |
`34 g` of `H_(2)O_(2)` is present in `1120 ml` of `H_(2)O` solution. This solution is called.A. `10 vol` solutionB. `20 vol` solutionC. `34 vol` solutionD. `32 vol` solution |
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Answer» Correct Answer - A `N=(W_(2)xx1000)/(EW_(2)xxVmL)` `=(34xx1000)/(17xx1120)=200/12` `1 N of H_(2)O_(2)=5.6 ` vol strength `200/12 N of H_(2)O_(2)=5.6xx200/12=10` vol strength |
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| 504. |
In which of the following is the hydration energy higher than the lattice energy?A. `BaSO_4`B. `MgSO_4`C. `RaSO_4`D. `SrSO_4` |
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Answer» Correct Answer - B Hydration enery of sulphate decreases from top to bottom in II group . `Mg^(2+)` is smaller than other given ions of II group, so `Mg^(2+)` is readily hydrated . `MgSO_4` has higher hydration energy than lattice energy . |
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| 505. |
Which is used in the laboratory for last drying of neutral gases?A. Phosphorus pentoxideB. Active charcoalC. Anhydrous calcium chorideD. `Na_(3)PO_(4)`. |
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Answer» Correct Answer - C Anthydrous `CaCl_(2)` is used for fast drying of neutral gases. |
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| 506. |
Hydrogen peroxide is …………… .A. an oxidising agentB. a reducing agentC. both an oxidising and a reducing agentD. neither oxidising nor reducing agent |
| Answer» Correct Answer - C | |
| 507. |
Explain the action of chlorine with water. |
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Answer» Chlorine reacts with the water to form hydrochloric acid and hypochlorous acid. Cl2(g) + H2O(I) → HCl(aq) + HOCl(aq) |
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| 508. |
What is the strength of (a) 10 volume H2O2 (b) 20 volume H2O2? |
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Answer» (a) 3% (b) 30% |
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| 509. |
The volume strength of `1*5` N `H_(2)O_(2)` solution isA. `4*8`B. `5*2`C. `8*8`D. `8*4`. |
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Answer» Correct Answer - D Strength = Normality `xxEq. Mass = 1*5xx17=25*5g L^(-1)` `{:(" "2H_(2)O_(2),to,2H_(2)O,+,O_(2)),(" "68g,,,,22400mL.),(~~68mL,,,,):}` 60 g of `H_(2)O_(2)` on decomposition gives `O_(2)=22400 mL` `25*5` g of `H_(2)O_(2)` on decomposition gives `O_(2)=(22400xx25.5)/(68)=8400mL` `:.` 1000 mL of `H_(2)O_(2)` solution gives 8400 mL of `O_(2)` 1 mL of `H_(2)O_(2)` solution gives 8*4 mL of `O_(2)`. ltbrlt `:.` Vol. strength of `H_(2)O_(2)=8*4` |
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| 510. |
Which of the following statememts are not correct ?A. `H_(2)O_(2)` oxidises Fe (II)to Fe (III)B. `H_(2)O_(2)` can be obatined by the electrolysis of dill. `H_(2)SO_(2)`C. `H_(2)O_(2)` reduces Mn (VII) to Mn (II)D. `H_(2)O_(2)` is a weak base |
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Answer» Correct Answer - D `H_(2)O_(2)` is not weak base but a weak acid. |
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| 511. |
Hydrogen behaves as an oxidising agent in its reaction withA. ChlorineB. NitrogenC. SodiumD. Sulphur. |
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Answer» Correct Answer - C `2Na+H_(2)to2NaH` In this reaction O.N. of H decreases from 0 (in `H_(2))` to -1 (in NaH). Thus in this reaction `H_(2)` is reduced and as such acts as an oxidising agent. |
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| 512. |
`K_(a)` of `H_(2)O_(2)` is of the order ofA. `10^(-12)`B. `10^(-14)`C. `10^(-16)`D. `10^(-10)` |
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Answer» Correct Answer - A `K_(a)` of `H_(2)O_(2)=1*55xx10^(-12)`. |
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| 513. |
Give the main characteristics of isotopes. |
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Answer» Since, the isotopes have the same electronic configuration, they have almost the same chemical properties. The only difference is in their rates of reactions, mainly due to their different enthalpy of bond dissociation. However, in physical properly of these isotopes differ considerably due to their large mass differences. |
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| 514. |
Name the isotopes of hydrogen. |
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Answer» Hydrogen has three isotopes: Protium, 11H deuterium, 2 1H tritium, 31H |
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| 515. |
Why does hydrogen occupy unique position in the periodic table? |
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Answer» Inspite of the fact that hydrogen, to a certain extent resembles both with alkali metals (ns’) and halogens (ns2 np5), it differs from them as well. Hydrogen has very small size as a consequence H+ does not exist freely and is always associated with other atoms or molecules. Thus, it is unique in behaviors and is therefore, best placed separately in the periodic table. |
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| 516. |
Knowing the properties of `H_(2)O` and `D_(2)O` , do you think that `D_(2)O` can be used for drinking purpose ? |
| Answer» Heavy water is injurious to human beings, plants and animals since it slows down the rates of reactions occuring in them. Thus, heavy water does not support life so well as does ordinary water. | |
| 517. |
Elements of which of the following group(s) of periodic table do not form hydrides?A. Group 7,8,9B. Group 13C. Group 15,16,17D. Group 14 |
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Answer» Correct Answer - A Dihydrogen forms molecular compounds with most of the p-block elements. Most familiar example are `CH_(4),NH_(3),H_(2)O` and HF. For convenience hydrogen compounds of non-metals have alos been considered as hydrides. |
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| 518. |
Hydrolysis is different from hydration. Elaborate. |
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Answer» Hydrolysis is a chemical reaction in which substance reacts with water under neutral, acidic or alkaline conditions. For example, aluminium chloride is hydrolysed by water as follows: `AlCl_(3)+3H_(2)O to Al(OH)_(3)+3HCl` Hydration on the other hand is the property of a chemical compound to take up molecules of water of crystallisation and get hydrated. For example, anhydrous copper sulphate `(CuSO_(4))` Which is white in colour takes up five molecules of `H_(2)O` to form hydrated copper sulphate `(CuSO_(4).5H_(2)O)` which has blue colour. `underset("Anhydrous whihte")(CuSO_(4)(s))+5H_(2)O(l) to underset("Hydrated-blue")(CuSO_(4).5H_(2)O)` |
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| 519. |
Explain with examples Polymeric hybrids. |
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Answer» Polymeric hydrides: These are formed by elements having electro negativity in the range 1.40 – 2.0. These usually exist in the polymeric form in which the monomer molecules are held together in two or three dimensions by hydrogen bridges. Some common examples are : (BeH2)n, (AlH3)n, (InH3)n , (GaH3)n , (SpH4)n. These are amorphous solids which decompose above 523 K to evolve H2 gas. Structure. Beryllium hydride exits in the polymeric form involving three center-two electron bonds. |
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| 520. |
What is the nature of H2O2? |
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Answer» H2O2 is acidic in nature. |
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| 521. |
In a reaction of F2 and H2O, what is the role of water? |
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Answer» 2F2 + 2H2O → 4HF + O2 water is acting as reducing agent. |
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| 522. |
Name two compounds which retard decomposition of H2O2. |
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Answer» Glycerol and acetanilide retard decomposition of H2O2. |
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| 523. |
What is the tradename of sodium hexa-metaphosphate? |
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Answer» The tradename of sodium hexa-metaphosphate is Calgon. |
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| 524. |
Give two examples of interstitial hydrides. |
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Answer» CuH, FeH are examples of interstitial hydrides. |
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| 525. |
Define hard water. |
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Answer» Water which does not produce lather with soap solution readily is called hard water. eg. hand pump water, river water, sea water etc. |
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| 526. |
Write the Name of a zeolite used in softening of hard water. |
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Answer» Sodium aluminum silicate Na2Al2Si2O8. X H2O. |
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| 527. |
Which compound/s is/are covalent hydrides?A. `CH_(4)`B. `CsH`C. `HCl`D. `NaH` |
| Answer» Correct Answer - A::C | |
| 528. |
Assertion. `H_(2)O` is the only hydride of group 16 which is a liquid at ordinary temperature . Reason. In ice, each oxygen atom is surrounded by two covalent bonds and two hydrogen bonds. |
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Answer» Correct Answer - B Correct explanation. Due to extensive H-bonding , water exists as associated molecules . As a result, it has high b.p. and thus water is a liquid at room temperature. |
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| 529. |
Give a reaction in which water acts as an oxidizing agent. |
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Answer» Na + H O→NaOH + 1/2 H2. |
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| 530. |
Which gas is produced on electrolysis of ionic hayride? |
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Answer» Dihydrogen gas is produced at the anode on electrolysis of ionic hydride. |
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| 531. |
Polyphosphates are used as water softening agents because theyA. form soluble complexes with anionic speciewsB. precipitate anionic speciesC. form soluble complexes with cationic speciesD. precipitate cationic species. |
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Answer» Correct Answer - C Polyphosphates are used as water softening agents because they remove impurities `(CaSO_(4) & MgSO_(4))` present in a hard water. `2CaSO_(4)+Na_(2)[Na_(4)(PO_(3))_(6)]rarrNa_(2)[Ca_(2)(PO_(3))_(6)]+2Na_(2)SO_(4)` `2MgSO_(4)+Na_(2)[Na_(4)(PO_(3))_(6)]rarrNa_(2)[Mg_(2)(PO_(3))_(6)]+2Na_(2)SO_(4)` |
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| 532. |
`H_(2)O_(2)` isA. Lighter than waterB. Denser than waterC. More viscous than waterD. Less viscous than water |
| Answer» Correct Answer - B::C | |
| 533. |
Which reaction shows oxidising nature of `H_(2)O_(2)`?A. `Ag_(2)O+H_(2)O_(2)toAg+H_(2)O+O_(2)`B. `MnO_(2)+H_(2)O_(2)+H_(2)SO_(4)toMnSO_(4)+2H_(2)O+O_(2)`C. `PbS+4H_(2)O_(2)toPbSO_(4)+4H_(2)O`D. `K_(2)Cr_(2)O_(7)+H_(2)SO_(4)+4H_(2)O_(2)toK_(2)SO_(4)+2CrO_(5)+5H_(2)O` |
| Answer» Correct Answer - C | |
| 534. |
What are the characteristic features of ionic or saline hydrides? |
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Answer» The ionic hydrides are crystalline, non – volatile non – conducting in solid state. However their melts conduct electricity. |
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| 535. |
Which of the following equations depict the oxidising nature of `H_(2)O_(2)` ?A. `2MnO_(4)^(-) + 6H^(+) + 5H_(2)O_(2) to 2Mn^(2+) + 8H_(2)O+ 5O_(2)`B. `2Fe^(3+) + H_(2)O_(2) to 2Fe^(2+) + 2H^(+) + O_(2)`C. `2I^(-) + 2H^(+) + H_(2)O_(2) to I_(2) + 2H_(2)O`D. `KIO_(4)+ H_(2)O_(2) to KIO_(3) + H_(2)O+O_(2)` |
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Answer» Correct Answer - C Only in reaction (c) , `O_(2)` is evolved , therefore, it represents the reducing action of `H_(2)O_(2)`. |
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| 536. |
What happens when sodium hydride reacts with water? |
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Answer» Saline hydride (sodium hydride) react violently with water producing dihydrogen gas NaH(s) + H2O(aq)→ NaOH(aq) + H2(g). |
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| 537. |
A commercial sample of hydrogen peroxide is labelled as 10 volume. Its percentage stregth is nearlyA. `3%`B. `1%`C. `90%`D. `10%`. |
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Answer» Correct Answer - D See Comprehensive Review. |
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| 538. |
What is hydrolith? How is it prepared? |
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Answer» Hydrolith is calcium hydride(CaH2). It can be prepared as: Ca + H2 \(\overset{\Delta}{\rightarrow}\) CaH2 |
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| 539. |
What is hydrolith? How is it prepared? |
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Answer» Hydrolith is calcium hydride `(CaH_(2))`. It is formed by heating calcium metal strongly with hydrogen. `Ca(s)+H_(2)(g) overset("Heat")to underset("Hydrolith")(CaH_(2)g)` |
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| 540. |
The metal (s) which react with NaOH(aq) to give `H_(2)` under ordinary conditions, is (are)A. SnB. AlC. FeD. Zn. |
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Answer» Correct Answer - A::B::D Iron do not react with NaOH (aq) under ordinary conditions. |
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| 541. |
When 1 mole of PbS reacts completely with `H_(2)O_(2)`A. `H_(2)` is liberatedB. `O_(2)` is liberatedC. 4 moles of `H_(2)O_(2)` consumedD. Sulphur is converted to sulphite |
| Answer» Correct Answer - C | |
| 542. |
The compound sodium polymetaphosphate `(Na[Na_(4)(PO_(3))_(6)])` is called calgon becauseA. It was developed by the scientist named ChallaghanB. It was developed first in CaliforniaC. It refers to calcium goneD. It is based on the name of the company which developed it. |
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Answer» Correct Answer - C Calgon name is obtained from calcium zone. |
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| 543. |
Hydrogen perioxde acts both as an oxidising agent and as reducing agent in alkaline solution towards certain first row transition metal ions. Iiustrate both these properties of `H_(2)O_(2)` using chemical equation. |
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Answer» `H_(2)O_(2)` as oxidising agent in alkaline medium. It oxidises manganese dioxide in the presence of an alkali `MnSO_(4)+H_(2)O_(2)_2NaOH to MnO_(2)+Na_(2)SO_(4)+2H_(2)O` `Mn^(2+)+H_(2)O_(2)+2OH^(-) to MnO_(2)+2H_(2)O` `H_(2)O_(2)` as reducing agent in alkaline medium It reduces potassium ferrricyanide to potassium ferrocyanide in the presence of an alkali `Mn^(2+)+H_(2)O_(2)+2OH^(-) to MnO_(2)+2H_(2)O` `2[Fe(CN)_(6)]^(3-)+2OH^(-)+H_(2)O_(2) to 2[Fe(CN)_(6)]^(4-)+O_(2)` |
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| 544. |
Assertion `(A)`: When blood is added to a solution of `H_2O_2`, the solution bubbles furiously. Reason `(R)` : Catalase (an enzyme) present in blood decomposes `H_2O_2` and produces bubbles of `O_2`.A. If both Statement-1 `&` Statement-II are True `&` the Statement-II is not a correct explanation of the Statement I.B. If both Statement-I `&` Statement-II are True but Statement-II is not a correct explanantion of the Statement-I.C. If Statement-I is True but the Statement-II is False.D. If Statement-I is False but the Statement-II is True. |
| Answer» Correct Answer - A | |
| 545. |
Assertion `:` Ionic hydrides like hydrolith liberates hydrogen gas on reaction with water. Reason `:` The resultant soution acts as strong base. |
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Answer» Correct Answer - b b |
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| 546. |
Why hydrogen behaves both as a halogen and as an alkali metal? |
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Answer» Hydrogen behaves both as a halogen and as an alkali metal due to following resemblance: (i) Resemblance with halogens: (a) It is non-metal. (b) It is gas like F2 and Cl2. (c) It is electronegative in nature. (d) it is electronegativity and ionization energy is similar to halogens. (e) it is liberated at anode when NaH is electrolyzed. (ii) Resemblance with alkali metals: (a) Its electronic configuration (1s1 ) is similar to alkali metals. (b) It is reducing agent like alkali metals. (c) It is lose one electron to form H+ ion like alkali metal. (d) It is liberated at cathode when HCl electrolyzed. (e) It is electropositive like alkali metals. |
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| 547. |
Assertion `(A)`: When blood is added to a solution of `H_2O_2`, the solution bubbles furiously. Reason `(R)` : Catalase (an enzyme) present in blood decomposes `H_2O_2` and produces bubbles of `O_2`.A. If both (A) and (R) are correct and (R) is the correct explanation of (A).B. If both (A) and (R) are correct but (R) is not the correct explanation of (A).C. If (A) is correct, but (R) is incorrect.D. If (A) is incorrect, but (R) is correct. |
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Answer» Correct Answer - A Both (A) and (R) are correct and (R) is the correct explanation of (A). |
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| 548. |
In solid ice, oxygen atom is surrounded (a) tetrahedrally by 4 hydrogen atoms(b) octahedrally by 2 oxygen and 4 hydrogen atoms (c) tetrahedrally by 2 hydrogen and 2 oxygen atoms (d) octahedrally by 6 hydrogen atoms |
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Answer» (a) tetrahedrally by 4 hydrogen atoms |
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| 549. |
The reaction H3PO2 + D2O → H2DPO2 + HDO indicates that hypo-phosphorus acid is ……(a) tri basic acid (b) di basic acid (c) mono basic acid (d) none of these |
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Answer» (c) mono basic acid Hypophosphorus acid on reaction with D2O, only one hydrogen is replaced P by deuterium and hence it is mono basic. |
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| 550. |
Consider the following statements. (i) In ice, each oxygen atom is surrounded by hydrogen atoms tetrahedrally to four water molecules. (ii) Acetic acid exists as dimer due to intra molecular hydrogen bonding. (iii) Strong hydrogen bonds lead to an increase in the melting and boiling points.Which of the above statements is/are not correct? ,(a) (ii) only (b) (i) and (iii) (c) (i) (ii) and (iii) (d) (i) only |
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Answer» (a) (ii) only |
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