Class 7 Acids Bases and Salts Important Questions VBQs

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Q1. Classify the following as acidic, basic or neutral-

Lime juice, baking soda, soap solution, lime water, water, fizzy drink, common salt

Q2. Fill in the blanks

a)_______________ acid is found in tamarind.

b) CH₃COOH is commonly known as __________________.

c) Most mineral acids are ______________ acids.

d) ______________ acid is also called the king of chemicals.

e) Water soluble bases are called _________________.

f) Calamine lotion contains _________________.

g) A metal oxide dissolves in water to form a _____________.

h) ____________________ is also called milk of magnesia.

Q3. Correct and rewrite the following statements

a)All bases are alkali.

b) Saliva is neutral in nature.

c) Acids obtained from unripe mangoes and grapes are mineral acids.

d) A mineral acid can be diluted by adding sufficient amount of water to it.

e) Lemon juice is best stored in metal jars.

Q4. Differentiate between an organic and a mineral acid.

Q5. Differentiate between an organic and a mineral acid.

Q6. Write an activity to show that-
Non metal oxides are acidic in nature.
Water is a neutral substance

Q7. Give reasons for the followinga)

A turmeric stain on your shirt turns reddish brown when soap is applied on it.

b) Common salt is added to pickles.

c) Working tables and shelves in your chemistry laboratory are covered with tiles and not wood or metals.

d) Acids taste sour. However, they must not be tasted in order to be identified.

e) Factory waste must be treated before discarding.

Q8. Write the chemical names of the following substancesa)

Vinegar- _____________________

b) Baking soda- _____________________

c) Washing soda- _____________________

d) Quick lime- _____________________

e) Milk of magnesia- _____________________

f) Slaked lime- _____________________

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