department of chemistry

Riddle # 5 I am a simple physical property of all gasses, which can be recorded by a thermometer. My value is fixed for each gas and I play an important role in liquefaction of gases by application of high pressure. You can write my Expression by using Van der Waal constants a and b. Questions (a)  Who  am I ? (b)  How am I related to liquefaction of        gases by high pressure ? (c)   What is my relation with a and b ? (d)  What is the status of liquid and vapor        phase of a substance when the gas        attains my value ?      

Riddle # 4   I am involved in all natural processes. My value in the universe is continuously increasing. Because of me, heat cannot be converted completely to work. Under certain condition my value is zero. Questions (a)   Who   am I ? (b)  Why my value is continuously        increasing in the universe ? (c)   In what way am I involved in        incomplete conversion of heat        into work ? (d)   When my value becomes zero ?       

Riddle # 3  Mr. X is the first member of a homologous series of organic compounds. He also possesses a few properties of another homologous series. He is the strongest one in his community. He can produce shinning mirror when treated with aqueous ammonia solution of silver nitrate. Questions a) Who is Mr. ‘X’ ? b) To which class of organic compound     does he belong ? c) Regarding which property he is the     strongest one ? d) Why can he produce shinning mirror     with aqueous ammonia solution of  AgNO 3

Riddle # 2 I am a highly effective electron donor, used in organic chemistry. You will find my 3 constituent elements  (2 metals & 1  non-metal) in the Ist  , II nd and III rd periods  of the periodic table. The non-metal one  has some properties of alkali metal. In an  organic compound having both C = C  & carbonyl functional groups, I can  selectively change one functional group to a new one. Questions (a)  What  are my constituent elements ? (b)  What is my name and formula ? (c)   Which functional group can I change        when both double bond and carbonyl         groups are present in an organic        compound ? (d)  What is the new functional group formed ?      

Riddle # 1   I am an inflammable organic compound. I am liked and enjoyed by some people but hated by others. I am used as base in many medicines because of my high solubility power. I am the only compound in my family who can produce iodoform . Using me, people make perfume. Questions (a)  Who  am I ? (b)  Why can I produce iodoform ? (c) Write down the iodoform reaction  using me. (d)  Write the name of the reaction for  making perfume.         

Using the pH scale (0-14 based on the equilibrium rate constant for water) it is possible to determine whether a solution is acidic or basic.  Here is a pH scale.