6. HYDROGEN AND IT S COMPOUNDS

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Virgil Short
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1 . YDROGEN AND IT S COMPOUNDS PREVIOUS EAMCET BITS Which of the following reactions represents the oxidizing property of O ( 008) 1) KMnO KSO + MnSO O K ) Fe CN + KO + O K Fe CN + O + O ) PbO + PbO + + O ) KI + + KSO + I + Ans: Sol: I is oxidised to I. ence, () is the correct answer. The reaction of O with x does not liberate gaseous product. Which of the following I X ( 00 M ) 1) PbO ) KMnO / + ) PbS ) Cl Ans: Sol: PbS+ PbSO + gas is not liberated () is the correct answer Which of the following reaction does not form gaseous products. ( 005 E) 1) PbO + ) Acidified KMnO + PbS+ O Cl + O ) Ans: Sol: PbS+ PbSO + ence () is the correct answer ) Which of the following is not correct regarding the electrolytic preparation of O ( 005 M) 1) Lead is used as cathode ) 50% SO is used ) ydrogen is liberated at anode ) Sulphuric acid undergoes oxidation Ans: Sol: ydrogen is liberated at cathode. is not correct answer. 5. In nuclear reactors, heavy water is used as a (199 E) Fuel. Projectile Moderator Arrestor Ans : In nuclear reactors heavy water is used as a moderator.. PbS + O O +... (199 E) PbSO Ans :. PbSO Pb( SO ) 1 Pb ( SO ) PbS+ + PbSO 7. Temporary hardness of water is due to presence of which salts of Calcium or Magnesium(199E)

2 Bicarbonates. Carbonates Chlorides Sulphates Temporary hardness is due to the presence of salts of Calcium (or) Magnesium bicarbonate 8. Permanent hardness of water is due to presence of (199 E) CaSO. MgCl Ca, Mg sulphates and chlorides None Permanent hardness of water is due to the presence of salts of calcium and magnesium chlorides and sulphate. 9. O oxidises to (199 E) S. 8 5 O oxidises S to S 10. Which of the following is not a true peroxide (1995 E) PbO. Na BaO NaO PbO is not a peroxide it is a dioxide. 1 + ( O ) i), ii) + I I + O O acts as (1995 E) oxidising agent in both (i) and (ii). reducing agent in both (i) and (ii) oxidising agent in (i) and reducing agent in (ii) reducing agent in (i) and oxidising agent in (ii) Oxidising agent in both reactions because it gains electron. The temperature at which heavy water has maximum density is, (199 E) 1 o C. o C 0 o C 1 o C eavy water has maximum density at 1 C 1 In which of the following reaction hydrogen peroxide acts as reducing agent? (000 E) PbS + O PbSO + O. NaSO + NaSO + Ag O moist + O Ag + O + O KI + O + SO KSO + I + O Ans : AgO + Ag + + O In the above reaction O reduess Ag O to Ag. 1 In which of the following reactions O acts as a reducing reagent? (001 E) PbO + O PbO + O + O ( s ) ( aq ) ( s ) ( l ) ( g ) Na SO. ( aq) ( aq) + O NaSO + aq O( l) KI + O KO + I ( aq) ( aq) ( aq) ( s) None

3 PbO + PbO + + O In the above reaction O reduces PbO to PbO process is used for the removal of hardness of water (001 E) Calgon. Baeyer Serpeck oope Calgon is the one of the process of removal of hardness of water. 1. What is the gas liberated when alkaline formaldehyde solution is treated with? (00 E) Co. N C C + COO The products formed when heavy water is reacted with magnesium nitride, are... (00 E) N, Mg ( O ) N, Mg ( OD). Mg N + D O Mg OD + ND ND, Mg ( O ) ND, Mg ( OD) 18. Ferrous ion change to X ion, on reacting with acidified hydrogen peroxide. The number of d-electrons present in X and its magnetic moment (in BM) are respectively (00 E) and.95.5 and and 9 and 5.9 Ans : With acidified O ferrous ion is changed to Ferric ion (Fe + ) 5 Fe = 1s s p s p d d electron are 5 μ= n+ ( n+ ) B.M n = number of unpaired electron μ= 5+ ( 5+ ) = 5 = 5.9B.M 19. The product obtained at anode when 50% aqueous solution is electrolysed using platinum electrodes is... (00 E) Ans :. 8 O Anode reaction is 8 + e 0. Sulphur trioxide is dissolved in heavy water to form a compound X. The hybridisation state of sulphur in X is (00 E) sp. sp sp dsp Ans : SO + DO DSO In D SO s atom under goes Sp hybridisation like in SO 1 C and 1T are formed in nature due to the nuclear reaction of neutron with... (00 E) 1 7 N. 1 C e Li

4 N + 0 n C + 1T. Exhausted permutit does not contain...ion (00 E) Na +. Mg + Exhaust Permutit does not contains Na + ions Al + A sample of water contains 111 ppm of CaCl. ardness of that water sample is (199 M) Ans : 111ppm of CaCl = 100 ppm of CaCO ardness of water is 100 ppm Volume of O gas liberated at STP by the decomposition of 15 ml of 0 volumes solution is (199 M) 150 ml. 00 ml 00 ml 50 ml Ans : 0 vol O means 1 m l of O gives 0 ml of O at STP on de composition. 15 ml of O gives 0 x 15 ml of O at STP = 00 ml 5. In the following reaction acts as AgO + O Ag + O + O (199 M) Oxidising agent. Reducing agent Bleaching agent None Ans : O acts as reducing agent because O taken nascent oxygen from Ag O.. ydrogen peroxide is prepared in the laboratory by (1995 M) adding to dil.. by passing CO into BaO paste in cold water by adding PbO to an acidified KMnO solution by adding NaO to cold water Ans : O is prepared by passing CO in to BaO paste in cold water. 7. In molecule the angle between two O - planes is (199 M) 90 o. 105 o 109 o 10 o In O molecule angle between two O planes is Which of the following statements concerning heavy water is correct? (199 M) it is an isotope of hydrogen. it is used as bleaching agent it is used as coolant in nuclear reactors it is used as a moderator in nuclear reactors eavy water is used as moderator in nuclear reactors. 9. When reacts with chlorine the product obtained is (1997 M) O. ClO Si + Cl

5 Cl + g O(aq) Cl(aq) + O(g) 0. The dielectric constants of and DO are 8 and 80.5 respectively. Therefore the solubility of NaCl in DO is... (1999 M) equal to. slightly lower slightly higher very high Ans : If dielectric constant is less than solubility is less. What is the solution used for the preparation of hydrogen peroxide by electrolytic procedure (000 M) 0. N NaO. 50% 0% NaO 5% NaCl Ans : For the preparation of O is electrolytic method 50% SO is used as electrolyte What is the gas liberated when alkaline formaldehyde solution is reacted with hydrogen peroxide in the presence of pyrogallol? (001 M). O C 5 CO C + COO + (g) Sodium hexa-metaphosphate is known as (001 M) Calgon. Permutit Natalite Nitrolim Sodium hexa meta phosphate is called calgon Calgon Na Na ( PO) ( or)[ NaPO] Which one of the following compounds undergoes hydrolysis during distrillations to yield hydrogen peroxide? (00 M) 8. NO PO 7 8(aq) + ( ) (aq) + (00 M) 5. What is the oxidation state of Fe in the product formed when acidified potassium ferrocyanide is treated with O? (00 M) K Fe( CN) + K SO + O K Fe CN K + SO + Potassium Ferricyanide K Fe( CN) In oxidation state of Fe is calculated as x+ = 0 x =+. O is the symbol of...ion. (00 M) Oxide. Super Peroxide Monoxide Ans : O is a peroxide 7. Which one of the following is used for reviving the exhausted permutit? (00 M) C/solution. 10%CaCl solution 10% MgCl Na ( ) Na PO

6 Exhausted Permutit is regenerated by adding 10% NaCl solution (Brine solution) 8. The chemical formula of Zeolite is... (00 M) KAlSiOx 8.. CaAlSiO8 Na Al Si O x O Na Na ( PO ) 8. Ans : Zeolite formula is Na Al Si O 8.X O 9. What is the formula of Calgon? (00 M) ( NaPO ) Mg ( PO ). NaPO Formula of Calgon is [ NaPO ] ( or ) Na Na ( PO ) MgSO 0. The formula of exhausted Permutit is (00 M) CaAlSiO8. x O. NaAlSiO8. x O CaBSiO8. x O KAlSiOx 8. Formula of exhausted Permutit is CaAl Si O 8. O (or) MgAlSiO 8.

HYDROGEN AND ITS COMPOUNDS

HYDROGEN AND ITS COMPOUNDS Short Answer Questions: 1. Write any two methods for the preparation of H 2 O 2? Ans. I) Electrolytic Method: Hydrogen peroxide is manufactured on a large scale by the electrolysis