Acids, Bases and Salts - Class 7 - Science
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Back Questions - Acids, Bases and Salts | NCERT | Science | Class 7
State differences between acids and bases.
Aspect | Acids | Bases |
---|---|---|
Taste | Sour | Bitter |
Litmus Test | Turn blue litmus red | Turn red litmus blue |
Texture | Usually, no distinct texture | Feels soapy to touch |
pH Value | Less than 7 | Greater than 7 |
Reaction with Metals | React to produce hydrogen gas | Usually, they do not react with metals |
Examples | Vinegar (Acetic acid), Lemon juice (Citric acid) | Baking soda (Sodium bicarbonate), Soap (Sodium or potassium salts of fatty acids) |
Neutralisation | Reacts with bases to form salt and water | Reacts with acids to form salt and water |
Indicator Reaction | Change the color of natural indicators like litmus, methyl orange | Change the color of indicators like phenolphthalein, litmus |
Ammonia is found in many household products, such as window cleaners. It turns red litmus blue. What is its nature?
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Sign up nowName the source from which litmus solution is obtained. What is the use of this solution?
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Sign up nowIs the distilled water acidic/basic/neutral? How would you verify it?
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Sign up nowDescribe the process of neutralisation with the help of an example.
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Sign up nowMark ' $T$ ' if the statement is true and ' $F$ ' if it is false:
(i) Nitric acid turn red litmus blue. (T/F)
(ii) Sodium hydroxide turns blue litmus red. (T/F)
(iii) Sodium hydroxide and hydrochloric acid neutralise each other and form salt and water. (T/F)
(iv) Indicator is a substance which shows different colours in acidic and basic solutions. (T/F)
(v) Tooth decay is caused by the presence of a base. (T/F)
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Sign up nowDorji has a few bottles of soft drink in his restaurant. But, unfortunately, these are not labelled. He has to serve the drinks on the demand of customers. One customer wants acidic drink, another wants basic and third one wants neutral drink. How will Dorji decide which drink is to be served to whom?
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Sign up nowExplain why:
(a) An antacid tablet is taken when you suffer from acidity.
(b) Calamine solution is applied on the skin when an ant bites.
(c) Factory waste is neutralised before disposing it into the water bodies.
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Sign up nowThree liquids are given to you. One is hydrochloric acid, another is sodium hydroxide and third is a sugar solution. How will you identify them? You have only turmeric indicator.
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Sign up nowBlue litmus paper is dipped in a solution. It remains blue. What is the nature of the solution? Explain.
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Sign up nowConsider the following statements:
(a) Both acids and bases change colour of all indicators.
(b) If an indicator gives a colour change with an acid, it does not give a change with a base.
(c) If an indicator changes colour with a base, it does not change colour with an acid.
(d) Change of colour in an acid and a base depends on the type of the indicator.
Which of these statements are correct?
(i) All four
(ii) a and d
(iii) b, c and d
(iv) only d
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Sign up nowExtra Questions - Acids, Bases and Salts | NCERT | Science | Class 7
"What color does China rose indicator give with acid and bases?"
China rose is recognized as a natural indicator. When used in experiments:
With acids, the China rose indicator imparts a dark pink (magenta) color.
With bases, it shifts to a green color.
Fill in the blanks with suitable words: An acid is a compound which, when dissolved in water, forms hydronium ions as the only $\qquad$ ions. A base is a compound which is soluble in water and contains $\qquad$ ions. A base reacts with an acid to form a $\qquad$ and water only. This type of reaction is known as $\qquad$.
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Sign up nowWhat are the examples of neutralization reactions in everyday life?
A Antacid acting on acid in the stomach
B Treatment of acidic soil by powdered lime
C Usage of conditioner after shampooing the hair
D All of these
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Sign up now$20~\mathrm{mL}$ of $0.1~\mathrm{M} \mathrm{H}{2} \mathrm{SO}{4}$ solution is added to $30~\mathrm{mL}$ of $0.2~\mathrm{M} \mathrm{NH}{4} \mathrm{OH}$ solution. The $\mathrm{pH}$ of the resultant mixture is $\left[\mathrm{pK}{\mathrm{b}}\right.$ of $\left.\mathrm{NH}_{4} \mathrm{OH}=4.7, \log 2=0.3010\right]$
A) 5.2
B) 9
C) 5
(D) 9.4
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Sign up nowWhich of the following oxides, upon dissolution in rainwater, causes acid rain?
A. Oxides of nitrogen in rainwater
B. Oxides of sulfur in rainwater
C. Both oxides of nitrogen & oxides of sulfur
D. Oxides of hydrogen in rainwater
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Sign up now$\mathrm{NaHCO}_3$ is the chemical formula of
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Sign up now- $\mathrm{HCl}$ 2) $\mathrm{CH}_3\mathrm{COOH}$ 3) $\mathrm{CH}_3\mathrm{COONa}$ 4) Rubber 5) common salt (m) Strong electrolyte (n) Weak electrolyte (o) non-electrolyte
A $m-1, 2; n-3, 4; o-5$
B $\mathrm{m}-1, 2, 3, 5; \mathrm{o}-4$
C $\mathrm{m}-1, 3, 5; \mathrm{n}-2; \mathrm{o}-4$
D $m-1, 2, 3; n-4; o-5$
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