Solve the following equation using Cramer’s rule:
2x+y-z=3; x+y+z=1; x-2y-3z=4
See Answer →Calculate the trend values by the method of least square from the following data and estimate the sales for the year 2025
| Year | 2016 | 2017 | 2018 | 2019 | 2020 |
| Sales of T.V (000) | 12 | 18 | 20 | 23 | 27 |
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From the following data calculate:
a. Coefficient of correlation
b. Standard deviation of Y
X=0.854Y; Y=0.89X; σx =3
See Answer →Compute median from the following data:
| Mid- valus | 115 | 125 | 135 | 145 | 155 | 165 | 175 | 185 | 195 |
| frequency | 6 | 25 | 48 | 72 | 116 | 60 | 60 | 22 | 3 |
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Write the reaction of formation of maltose from its monomers giving appropriate structures with proper labeling.
See Answer →Differentiate between reducing and non-reducing sugars giving one example of each type.
See Answer →Write the reactions involved when β -D-glucose is treated with excess of acetic anhydride in the presence of pyridine
See Answer →Explain the formation of methyl glycoside of - and - D-glucose. Also give their structures.
See Answer →Explain Edman degradation giving the reactions involved in it. Give the advantage of this method.
See Answer →Discuss ninhydrin test giving the reactions involved.
See Answer →How will you synthesise valine using Gabriel phthalimide synthesis? Explain giving the sequence of reactions involved.
See Answer →How can you prepare 1,3,5-tribromobenzene? Why it cannot be prepared by bromination of benzene ?
See Answer →Explain the nitrosation reaction of secondary and tertiary amines giving suitable reactions.
See Answer →(a) What are lactams? Write the structures of γ -butyrolactam and δ -valerolactam and give their IUPAC names. (3) (b) Draw the enantiomers of N-methylethanamine.
See Answer →How would you prepare the following?
(i) Ethanoic anhydride using ketene
(2) (ii) A tertiary alcohol starting from an ester
See Answer →Explain Fischer esterification of carboxylic acids giving its mechanism.
See Answer →Draw a labelled schematic graph of a conductometric titration between a weak acid and a strong base.
See Answer →Calculate the time for which a current of 0.65 A be passed through molten magnesium chloride to get 5 g of magnesium.
(Given: Mm(Mg) =24.25 g mol -1)
See Answer →(b) The cell reaction for a galvanic cell is given below
Cu(s) + 2Ag+ (aq) →Cu2+ (aq) + 2Ag(s)
(i) Write the half-cell reactions at the anode and the cathode
(ii) Calculate the value of cell emf under standard conditions; use data from Table 7.1
(iii) Will the reaction be spontaneous as written?
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