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Past Imperfect Active: Subject + was/were + Verb(ing) + Object Passive: Subject (1) + was/were + being + Verb (3) + (by + agent)
The slow corrosion of iron in the presence of moist air is known as:
Which of the following chemical substances has its formula incorrectly paired?
What causes the black color of Black Soil?
Which element is used for making of lead of a pencil?
Which element is denoted by the atomic number 28?
Sodium Chloride is an example of
Which of the following metals is the lightest?
What is the pH value of pure water ?
Which of the following pollutants is the major contributor to photochemical smog?
Which of the following gas is used to fill balloons.