...ISC Board Question Paper Class XII – 2009 Chemistry (Theory) (Candidates are allowed additional 15 minutes for only reading the paper. Thay must NOT start writing during this time) General Instruction: (i). All working including rough work should be done on the same sheet as, and adjacent to the rest of the answer. (ii). The intended marks for questions or parts of questions are given in brackets []. (Material to be supplied: Log tables including Trigonometric functions) (iii). A list of useful physical constants is given at the end of this paper. PART I Q1. (a) Correct the following statements by changing the underlined part of the sentence. (Do not change the whole sentence) : [5] (i) For all spontaneous processes the change in entropy is zero. (ii) Formaldehyde undergoes Cannizzaro’s reaction since it has one alpha hydrogen atom. (iii) In a co-ordination complex, donation of electron pair takes place from the central metal atom to the ligands. (iv) An aqueous solution of sodium sulphate is acidic in nature. (v) The solubility product of sliver chloride in water decreases on addition of potassium chloride to the solution. (b) Complete the following statements by selecting the correct alternative from the choices given: [5] (i) The number of Faradays required to reduce one mol of (Cu)+2 to metallic copper is: (a) One (b) Two (c) Three (d) Four. (ii) When...
Words: 1331 - Pages: 6
...Introduction to the Thermodynamics of Materials Third Edition David R. Gaskell Preliminaries ‡ Settings Off@General::spellD ‡ Physical Constants Needed for Problems ü Heat Capacities The generic heat capcity c 105 bT Å Cp = a + ÅÅÅÅÅÅÅÅÅÅ + ÅÅÅÅÅÅÅÅÅÅÅÅÅÅ ; T2 103 The heat capacities of various elements and compounds are CpAgs = Cp ê. 8a Ø 21.30, b Ø 8.54, c Ø 1.51 8.3144 , Rla -> 0.082057 < ; The number of moles can be calculated from the starting state: P 1 V1 nmols = ÅÅÅÅÅÅÅÅÅÅÅÅÅÅÅÅ ê. nums ; Å Rla T1 subs = Append@nums, n -> nmolsD 8V1 Ø 10, T1 Ø 298, P1 Ø 10, P2 Ø 1, R Ø 8.3144, Rla Ø 0.082057, n Ø 4.08948< Finally, this constant will convert liter-atm energy units to Joule energy units. All results are given in Joules: laToJ = 101.325 ; ü 1. Reversible, Isothermal Process In an isothermal process for an ideal gas, DU = 0 ; DH = 0 ; thus heat and work are equal and given by: P2 q = w = n R T1 LogA ÅÅÅÅÅÅÅ E J ê. subs P1 -23330.9 J 16 Notes on Gaskell Text ü 2. Reversible Adiabatic Expansion In an adiabatic expansion q = 0; and P V g is a constant. Thus the final state has 1êg g P2 V2 i P1 V1 y Å ; T2 = ÅÅÅÅÅÅÅÅÅÅÅÅÅ ê. g -> 5 ê 3 Å V2 = j ÅÅÅÅÅÅÅÅÅÅÅÅÅÅÅ z j z n Rla k P2 { P1 V 1 P2 I ÅÅÅÅÅÅÅÅÅÅÅÅÅ M P ÅÅÅÅÅÅÅÅÅÅÅÅÅÅÅÅ2 ÅÅÅÅÅÅÅÅÅ ÅÅÅÅÅÅÅÅ Å n Rla 5ê3 3ê5 For an ideal gas cv = 3R/2; thus 3 DU = ÅÅÅÅ n R HT2 - T1 L ê. subs 2 -9147.99 or we can use 3 DU = ÅÅÅÅ HP2 V2 - P1 V1 L laToJ ê. Append@subs, g -> 5 ê 3D 2 -9148.02 For some numeric results, the...
Words: 8379 - Pages: 34
...Sample Problems - Chapter 7 1. Which of the following statements is most correct? a. Bond prices and interest rates move in the same direction, i.e., if interest rates rise, so will bond prices. b. The market price of a discount bond will approach the bond's par value as the maturity date approaches. Barring changes in the probability of default, there is no way the value of the bond can fail to increase each year as the time to maturity approaches. c. The "current yield" on a noncallable discount bond will normally exceed the bond's yield to maturity. d. The "current yield" on a noncallable discount bond will normally exceed the bond's coupon interest rate. e. All of the statements above are false. 2. If the yield to maturity decreased 1 percentage point, which of the following bonds would have the largest percentage increase in value? a. A 1-year bond with an 8 percent coupon. b. A 1-year zero-coupon bond. c. A 10-year zero-coupon bond. d. A 10-year bond with an 8 percent coupon. e. A 10-year bond with a 12 percent coupon. 3. Which of the following statements is most correct? a. The discount or premium on a bond can be expressed as the difference between the coupon payment on an old bond, which originally sold at par, and the coupon payment on a new bond, selling at par, where the difference in payments is discounted at the new market rate. b. The price of a coupon bond is determined primarily by the number of years to maturity. c. On a coupon...
Words: 3871 - Pages: 16