Chemistry Multiple Choice Question

Q.1 Which one of the following is strongest oxidizing agent among the following?
A) HClO
B) HClO2
C) HClO3
D) HClO4
 Q.2 The noble gas is used in weather balloons?
A) He
B) Ne
C) Ar
D) Xe
 Q.3 The heaviest gas is
A) SO2
B) NO3
C) Rn
D) Cl2
Q.4 The gas used in bactericidal lamp is
A) He
B) Kr
C) Xe
D) Rn
Q.5 Which of the following is used as local anesthesia?
A) Halothane
B) Chloroform
C) Diethyl ether
D)Tetrachloromethane

 Answers
1. A
2. A
3. C
4. C
5. C
Explanation:
Q.1
     HClO is strongest oxidizing agent among the oxyacids of chlorine.
The oxiding power of HClO4, HClO3, HCLO2, HClO are in the following order:
HClO >HCLO2 >HClO3>HClO4
because the oxidizing power of oxyacids of chlorine is inversely related to the thermal stability of these acids i.e. higher the thermal stability, lower will be oxidizing power of the oxyacid and vice versa. For example the HClO4 is most stable so it has lowest oxidizing power amongst the oxyacids of chlorine. The order of thermal stability of oxyacids of chlorine is HClO4>HClO3>HClO2>HClO.
Q.2
     Helium(He) is lightest gas that is why it is used in whether balloons for measurement of atmospheric pressure and air direction.
Q.3
    Radon(Rn) is heaviest gas of the periodic table.It is heavy than SO2,NO2 and Cl2 gases.The molar mass of Rn us greater than all given gases i.e: Rn = 222 g/mol
Q.4
    Xenon (Xe) uses in bactericidal or germicidal lamps because it emits UV radiations which helps to kill bacteria or germs.
Q.5
Local anesthesia uses medicine to block sensations of pain from a specific area of the body. Local anesthetics are usually given by injection into the body area that needs to be anesthetized. They are not injected into the bloodstream (intravenous, IV).So diethyl ether is preferred to use as local anesthesia.However halothane,chloroform and carbontetrachlororide are also used as anesthetic chemicals.