Who emits essential oxygen? Who absorbs your exhaled `CO_2`?

How many oxygen atoms are there in 1 mole of CO_(2) ?

An organic compound contains 69% carbon and 4.8% hydrogen, the remainder being oxygen. Calculate the masses of CO_(2) and water produced when 0.20g of this substance is subjected to complete combustion.

Write down the name of the alkali metal compound which- used for the absorption of CO_2 from exhaled air in space capsules and submarines

Chemical fertilizer and pesticides have many tone effects on fish, toxic effects are also seen in those who eat fishes. If you or your neighbours know about any such reactions, write them down.

Choose the right sequential phenomena among following during the delivery of O_(2) from blood to tissue P. Absorption of CO_(2) by the blood Q. Reaction of absorbed CO_(2) " with " H_(2)O to from H_(2)O_(3) within RBC and its conversion into H^(+) and HCO_(3)^(-) ions R. Reaction of absorbed CO_(2) " with " H_(2)O in plasma to form H_(2)CO_(3) and its conversion into H^(+) " and " HCO_(3)^(-) S. Combination of H^(+) with haem portion of HbO_(2) to release O_(2) T. Combination of HCO_(3)^(-) with heme portion HbO_(2) to form reduced haemoglobin and release of O_(2)

Assuming that the air is essentially a mixture of nitrogen and oxygen in mole ratio of 4 : 1 by volume. Calculate the partial pressures of N_2 and O_2 on a day when the atmospheric pressure is 750 mm of Hg. Neglect the pressure of other gases.

Mohit bought 6 bananas for ₨. 18 from a vendor and Raju bought 2 dozen of bananas for ₨. 72 from another vendor. Let's express in ratio to find who paid more for bananas.

Express the following statements in the form of two simultaneous linear equations in two variables and determine whether these equations are solvable or not by the method of finding the relations among the ratios of the co-efficients of the same variables and the constant terms : The sum of the present ages of your elder sister and your father is 84 years. After 8 years, your father's age will be 2""1/3 times of your elder sister.