Which of the following produces black spots when it comes in contact with organic substances such as skin and cellulose?

Related Mcqs:

1. When an active metal like Al comes in contact with less active element like Cu then it produces__________________?

   A. dry cell
   B. galvanic cell
   C. electrolytic cell
   D. A and B

2. Some substances are good conductor of electricity in both the solid and liquid states. These substances are generally______________?

   A. ionic substances
   B. metallic substances
   C. molecular solids
   D. covalent network solids

   Submitted by: Mansoor Ul Haque

3. Ammonium cynanate was 1st Inorganic compound that was converted into an Organic compound (in Lab) through boiling water. The organic compound was____.

   A. Methane
   B. Ethanol
   C. Acetic acid
   D. Urea

   Submitted by: Aamir khan Hullio

4. All of the following substances are crystalline except_____________?

   A. Ice
   B. Diamond
   C. Sucrose
   D. Plastic

   Submitted by: Mansoor Ul Haque

5. Which of the following substances does not give iodoform test ?

   A. acetaldehyde
   B. ethyl alcohol
   C. methyl alcohol
   D. acetone

6. Which of the following substances does not give iodoform test ?

   A. acetaldehyde
   B. ethyl alcohol
   C. methyl alcohol
   D. acetone

7. Which one of the following substances conducts electricity by the movement of ions ?

   A. Graphite
   B. Copper
   C. Molten sodium chloride
   D. Mercury

8. Which catalyst is used in contact process ?

   A. Fe2O3
   B. V2O5
   C. SO3
   D. Ag2O

9. Which of the following methods is used to estimate hydrogen in an organic compound ?

   A. Combustion method
   B. Dumas method
   C. Kjeldahls method
   D. All of the above methods are for different purposes

10. Which one of the following gives the measure of Organic pollution in water?

    A. COD
    B. DO
    C. PH
    D. Salinity

    Submitted by: Said wali shah