The coloured glassy mass in borax bead test is due to the formation of___________________?

Related Mcqs:

1. Which of the following does not give Borax bead test ?

   A. Cu
   B. Cr
   C. Ni
   D. A1

2. In borax bead test which compound is formed_________?

   A. Ortho burate
   B. Meta borate
   C. Double oxide
   D. Tetra borate

   Submitted by: Muhammad Ali Kunbhar

3. Which one does not give borax bead test_________________?

   A. Copper sulphate
   B. Barium sulphate
   C. Cobalt sulphate
   D. Nickel sulphate

4. Borax is a white crystalline solid and it is_________________?

   A. More soluble in cold water
   B. More soluble in hot water
   C. Insoluble in water
   D. Soluble only in organic solvents

5. Aqueous solution of borax above 62°C gives crystals of________________?

   A. Na2B4O7.4H2O
   B. Na2B4O7.5H2O
   C. Na2B4O7.2H2O
   D. Na2B4O7.10H2O

6. Mass spectrometer is used to determine Mass number of isotopes and___________________?

   A. Atomic number
   B. Relative abundance
   C. Electronic configuration
   D. All of the above

7. A sample of an iron and oxygen ore has a mass of 35.8 grams. The iron in the compound has a mass of 27.9 grams. What is the percent iron in the ore?

   A. 74% Fe
   B. 75% Fe
   C. 77% Fe
   D. 78% Fe

   Submitted by: Muhammad Ali Kunbhar

8. Milk tastes sour when kept in the open for sometime due to the formation of __________?

   A. lactic acid
   B. citric acid
   C. acetic acid
   D. carbonic acid

   Submitted by: Abid Hussain

9. Tincal is a mineral of___________________?

   A. A1
   B. Si
   C. B
   D. C

10. Rate of enzymatic reaction is directly proportional to the concentration of___________________?

    A. Enzyme
    B. Substrate
    C. Enzyme and substrate
    D. Enzyme and product