MEDIUM
7th CBSE
IMPORTANT
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Turmeric is a natural indicator. On adding its paste to acid and base separately, which colours would be observed?

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Important Questions on PREP TEST

MEDIUM
7th CBSE
IMPORTANT
Foundation Course Chemistry>Chapter 3 - PREP TEST>SECTION - A>Q 15
Identify the incorrect statements.
MEDIUM
7th CBSE
IMPORTANT
Foundation Course Chemistry>Chapter 3 - PREP TEST>SECTION - A>Q 16
Galvanisation is a process in which
MEDIUM
7th CBSE
IMPORTANT
Foundation Course Chemistry>Chapter 3 - PREP TEST>SECTION - A>Q 17
Aqueous solution of sodium hydroxide turns
HARD
7th CBSE
IMPORTANT
Foundation Course Chemistry>Chapter 3 - PREP TEST>SECTION - A>Q 19

Which of the following is formed when sulphuric acid reacts with lime water?

MEDIUM
7th CBSE
IMPORTANT
Foundation Course Chemistry>Chapter 3 - PREP TEST>SECTION - A>Q 20
What is the chemical formula of rust?
HARD
7th CBSE
IMPORTANT
Foundation Course Chemistry>Chapter 3 - PREP TEST>SECTION - B>Q 21
What would happen to a pink coloured solution formed by adding phenolphthalein and NaOH, when sulphuric acid is added to it?
HARD
7th CBSE
IMPORTANT
Foundation Course Chemistry>Chapter 3 - PREP TEST>SECTION - B>Q 22
How does the process of rusting depend upon humidity?
HARD
7th CBSE
IMPORTANT
Foundation Course Chemistry>Chapter 3 - PREP TEST>SECTION - B>Q 23
What would happen when a few drops of sour milk are put on the blue litmus paper?