Question 51. Polarographic method of analysis to obtain individual amounts of Cu2+ and Cd2+ in a given mixture
of the two ions (Cu2+ and Cd2+) is achieved by measuring their

Question 52. N,N-Dimethylformamide (DMF) gives different patterns of signals for the methyl protons when its 1H NMR spectrum is recorded at different temperatures.Match the patterns of the NMR signals given in column I with temperatures given in the column II.                                            I                                                                        II(i) Two singlets,for three protons each, at δ 2.87 and 2.97 ppm   (x) 25 °C(ii) One sharp singlet for six protons at δ 2.92 ppm                        (y) 120 °C(iii) One broad signal for six protons                                                 (z) 150 °C

Question 53. Heating a mixture of ammonium chloride and sodium tetrahydridoborate gives one liquid product(X), along with other products, under ambient conditions.Compound X is

Question 54. N,N-Dimethylformamide (DMF) gives different patterns of signals for the methyl protons when its 1H NMR spectrum is recorded at different temperatures. Based on the above data, the calculated difference in the frequencies of the two methylsinglets, if the spectrum is recorded on a 300 MHz spectrometer, is _________ Hz.

Question 55. Heating a mixture of ammonium chloride and sodium tetrahydridoborate gives one liquid
product(X), along with other products, under ambient conditions.Compound X is an example of

Question 56. The standard half-cell reduction potential of Fe3+ (aq) | Fe is “ 0.036 V and that of OH- (aq) | Fe (OH)3 (s) | Fe is “ 0.786 V.The value of loge (KSP) for Fe (OH)3 at 298 K is

Question 57. The standard half-cell reduction potential of Fe3+ (aq) | Fe is “ 0.036 V and that of OH- (aq) | Fe (OH)3 (s) | Fe is “ 0.786 V.For the determination of solubility product (KSP) of Fe (OH)3 ,
the appropriate cell representation and its emfare, respectively,

Question 58. If 3 ≤ X ≤ 5 and 8 ≤ Y ≤ 11 then which of the following options is TRUE?

Question 59. Mahatama Gandhi was known for his humility as

Question 60. The Headmaster ___________ to speak to you. Which of the following options is incorrect to complete the above sentence?