7th Grade > Chemistry
ACIDS BASES AND SALTS MCQs
Total Questions : 116
| Page 4 of 12 pages
Answer: Option B. -> False
:
B
Distilled wateris neutral in character, i.e., it is neitheracidicnorbasic. Neutral nature ofdistilled watercan be verified by the use of blue and red litmus paper.
:
B
Distilled wateris neutral in character, i.e., it is neitheracidicnorbasic. Neutral nature ofdistilled watercan be verified by the use of blue and red litmus paper.
Answer: Option D. -> Vinegar
:
D
Baking soda, Caustic soda and toothpaste are basic in nature.
Vinegar is the only acid in the given list.
:
D
Baking soda, Caustic soda and toothpaste are basic in nature.
Vinegar is the only acid in the given list.
Answer: Option B. -> Acidic or neutral
:
B
Phenolphthalein is an acid-base indicator which is colourless in acidic and neutral solutions. It turns pink to red in alkaline solutions.
:
B
Phenolphthalein is an acid-base indicator which is colourless in acidic and neutral solutions. It turns pink to red in alkaline solutions.
Answer: Option B. -> Baking soda
:
B
The common name ofsodium bicarbonate (NaHCO3) is baking soda. It is added to bakery products like bread and cakes.
:
B
The common name ofsodium bicarbonate (NaHCO3) is baking soda. It is added to bakery products like bread and cakes.
Answer: Option B. -> False
:
B
The sting of an ant contains formic acid which causes irritation on the skin. Calamine solution contains zinc carbonate which is a base. Calamine solution neutralizes the acid effect of the ant bite when applied on the skin.
:
B
The sting of an ant contains formic acid which causes irritation on the skin. Calamine solution contains zinc carbonate which is a base. Calamine solution neutralizes the acid effect of the ant bite when applied on the skin.
Answer: Option A. -> Hydrogen
:
A
An acid reacts with a metal andgives a salt with evolution of hydrogen gas.
Acid+metal→salt+H2
Many reactive metals like sodium, potassium, etc.displace hydrogen from acids.
2HCl+2Na→2NaCl+H2
:
A
An acid reacts with a metal andgives a salt with evolution of hydrogen gas.
Acid+metal→salt+H2
Many reactive metals like sodium, potassium, etc.displace hydrogen from acids.
2HCl+2Na→2NaCl+H2
Answer: Option B. -> False
:
B
The leftover food in the mouth is eaten by bacteria which releases acid into the mouth. This causes tooth decay.
:
B
The leftover food in the mouth is eaten by bacteria which releases acid into the mouth. This causes tooth decay.
Answer: Option C. -> Turmeric
:
C
An indicator is a substance which indicates if a substance is acidic or basic. Turmeric is a natural acid-base indicator which is yellow in colour. It remains yellow in an acidic solution and turns to reddish brown in a basic solution.
:
C
An indicator is a substance which indicates if a substance is acidic or basic. Turmeric is a natural acid-base indicator which is yellow in colour. It remains yellow in an acidic solution and turns to reddish brown in a basic solution.
:
Why: 1 Mark
Which: 1 Mark
The sour taste of many fruits and vegetables is due to the various types of acids present in them. The word acid is derived from a Latin word, which means "sour”.
Lactic acid is present in curd.
:
Each point: 1 Mark
AcidsBases(i)Acidsaresourintaste.(i)Basesarebitterintaste.(ii)Theyturnlitmuspaperred.(ii)Theyturnlitmuspaperblue.(iii)Theydonotfeelsoapywhentouched.(iii)Theyfeelsoapywhentouched.
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