Which substances is used in refrigerator instead of CFC ?

CFCs (chlorofluorocarbons) are greenhouse gases that have caused a rise of 3 degree C in the global temperatures in the past century. Name the CFC that is used in refrigerators.

Q. Which of the following gas is used in Refrigerator for cooling?

Which of the following is a suitable drying agent for carbon dioxide?ACaOBCaCl2

Health care facilities such as hospitals employ refrigeration to safeguard temperature-sensitive materials such as vaccines and drugs from developing life-threatening bacteria and toxins.  Some refrigeration systems utilize Freon (CCl2F2) as a refrigerant, which is produced through an exothermic reaction between CCl4(l) and HF(g).CCl4(l) + 2 HF(g) → CCl2F2(g) + 2 HCl(g)Reaction 1The formation of Freon through Reaction 1 occurs via a two-step reaction mechanism, with each step catalyzed by chromium(III) fluoride (CrF3).CCl4(l) + HF(g) → CCl3F(g) + HCl(g) Ea = 73.1 kJ/molReaction 2CCl3F(g) + HF(g) → CCl2F2(g) + HCl(g) Ea = 38.3 kJ/molReaction 3During a refrigeration cycle, gaseous Freon is pressurized in a compressor and liquified.  The liquified Freon releases its heat into the surroundings as it travels to a throttling valve, where it expands.  As the liquid Freon expands, it rapidly becomes a gas while absorbing heat and cooling the surroundings.  The cold gaseous Freon is recovered and another cycle begins.  The relationship between pressure and enthalpy of Freon during a refrigeration cycle is shown in the phase diagram in Figure 1.Figure 1  A pressure-enthalpy (P-H) phase diagram of Freon during a refrigeration cycle (Note: The curve represents the boundary between the liquid and gas phases.) Question 19Which of the following statements correctly describes the energy associated with the breaking and forming of bonds during Reaction 1?A.The energy absorbed when breaking the bonds of the reactants is greater than the energy released when forming the bonds of the products.B.The energy absorbed when breaking the bonds of the reactants is less than the energy released when forming the bonds of the products.C.The energy released when breaking the bonds of the reactants is greater than the energy absorbed when forming the bonds of the products.D.The energy released when breaking the bonds of the reactants is less than the energy absorbed when forming the bonds of the products.

Multiple Choice QuestionThe chloroflurorocarbons, or CFCs, that are the principle agents of stratospheric ozone depletion were once commonly used in Blank______.Multiple choice question.home constructionrefrigerators and spray cansagriculturepaints and gasoline