Which of the following factors favors a release of oxygen from hemoglobin?

Q. The oxygen haemoglobin dissociation curve shifts either to right or left according to various factors. Shift to right indicates dissociation of oxygen from haemoglobin. Which of the following factors will shift the curve to the right?
(i) Decrease in partial pressure of oxygen.
(ii) Increase in partial pressure of $C{O}_2$
(iii) Decrease in hydrogen ion concentration
(iv) Increase in $pH$
(v) Increase in body temperature

Q.

Which of the following factors does not induce left shift (dotted lines) as shown in the following graph?

Q. Which of the following conditions is/are favorable for oxyhaemoglobin formation in alveoli?
i) High partial pressure of oxygen, low partial pressure of carbon dioxide
ii) Low partial pressure of oxygen, high partial pressure of carbon dioxide
iii) Low pH, low temperature
iv) High pH, high temperature

Q. Environmental factors which regulate the rate of release of nutrients into the atmosphere are
a. pH
b. Soil
c. Moisture
d. Temperature

Q.

Which of the following factors does not induce left shift (dotted lines) as shown in the following graph?