Question

a) Fill in the blanks:

i) The difference between position of the absorption band for a given atom and the position of the peak for TMS is called ________.

ii) Hemoglobin consists of ________ units of myoglobin.

iii) $^{14}_{7}N + ^{4}_{2}He \rightarrow ? + ^{1}_{1}H$

iv) EAN of Cr in Cr(CO)6 is ________.

Select the correct alternative:

i) Those nuclear reactions in which Q-value is positive are called as-

ii) Oxygenation of hemoglobin is favoured at ________ pressure.

iii) Silicones are used as a -

iv) Planck's quantum theory of radiation explains-

Answer 1

a) i) Chemical shift ii) 4 iii) $^{17}_{8}O$ iv) 36 b) i) a) Exoergic reactions ii) b) High iii) d) All of these iv) d) All of these

Answer 2

a) i) Chemical shift is the standard term for the difference in resonance frequency of a nucleus relative to a standard (like TMS) in NMR spectroscopy.

a) ii) Hemoglobin is a tetrameric protein consisting of four subunits, each similar in structure to myoglobin.

a) iii) Nuclear reactions conserve both atomic number (charge) and mass number. Balancing these yields the unknown particle $^{17}_{8}O$.

a) iv) EAN is calculated using the formula EAN = Atomic Number - Oxidation State + 2 * Coordination Number.

b) i) Exoergic reactions release energy (positive Q-value), while endoergic reactions absorb energy (negative Q-value).

b) ii) The binding of oxygen to hemoglobin is cooperative and depends on the partial pressure of oxygen, being high at high pressure and low at low pressure.

b) iii) Silicones are versatile polymers used in various applications including hydraulic fluids, lubricants, and electrical insulation.

b) iv) Planck's quantum theory provided the foundation for understanding the quantized nature of energy and light, which is essential for explaining the photoelectric effect, the structure of atoms (like in Bohr's model), and the Compton effect.