Question

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4. Which of the following is a physical change:
b. Rusting of iron
a. Burning of Mg
d. None of the these
c. Glowing of bulb
5. Which of the following crystals can be obtained:
b. NaCl
a. CuSO4
d. Carbon
c. MgS04
6. The process of coating zinc over an iron sheet:
a. Crystallisation
b. Galvanization
c. Alloying
d. Electroplating
7. Reaction in which acid and base react together is known as:
a. Acid base reaction
b. Chemical reaction
C. Titration
d. Neutralisation
8. When iron gets covered with a brown powdery substance we call it as:
a. Alloying
b. Rusting
c. Electroplating
d. Refining
9. Those substances which are powdery and possess no definite geometrical shape arena
a. Crystalline substances
b. Amorphous substances
c. Anhydrous substances
d. Thydlated substances​

Answer 1

Answer:

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