Acids, Bases and Salts - Class 10 - Science
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Back Questions - Acids, Bases and Salts | NCERT | Science | Class 10
A solution turns red litmus blue, its $\mathrm{pH}$ is likely to be
(a) 1
(b) 4
(c) 5
(d) 10
A solution that turns red litmus paper blue is basic in nature. The pH scale ranges from 0 to 14, with 7 being neutral. A pH value less than 7 indicates acidity, and a pH value greater than 7 indicates basicity (alkalinity).
Among the options given:
- (a) pH 1 is highly acidic.
- (b) pH 4 is also acidic.
- (c) pH 5 is still acidic, although closer to neutral.
- (d) pH 10 is basic.
Therefore, a solution that turns red litmus blue is likely to have a basic pH. The correct answer is:
(d) 10
A solution reacts with crushed egg-shells to give a gas that turns lime-water milky. The solution contains
(a) $\mathrm{NaCl}$
(b) $\mathrm{HCl}$
(c) $\mathrm{LiCl}$
(d) $\mathrm{KCl}$
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Sign up now$10 \mathrm{~mL}$ of a solution of $\mathrm{NaOH}$ is found to be completely neutralised by $8 \mathrm{~mL}$ of a given solution of $\mathrm{HCl}$. If we take $20 \mathrm{~mL}$ of the same solution of $\mathrm{NaOH}$, the amount $\mathrm{HCl}$ solution (the same solution as before) required to neutralise it will be
(a) $4 \mathrm{~mL}$
(b) $8 \mathrm{~mL}$
(c) $12 \mathrm{~mL}$
(d) $16 \mathrm{~mL}$
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Sign up nowWhich one of the following types of medicines is used for treating indigestion?
(a) Antibiotic
(b) Analgesic
(c) Antacid
(d) Antiseptic
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Sign up nowWrite word equations and then balanced equations for the reaction taking place when -
(a) dilute sulphuric acid reacts with zinc granules.
(b) dilute hydrochloric acid reacts with magnesium ribbon.
(c) dilute sulphuric acid reacts with aluminium powder.
(d) dilute hydrochloric acid reacts with iron filings.
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Sign up nowCompounds such as alcohols and glucose also contain hydrogen but are not categorised as acids. Describe an Activity to prove it.
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Sign up nowWhy does distilled water not conduct electricity, whereas rain water does?
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Sign up nowWhy do acids not show acidic behaviour in the absence of water?
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Sign up nowFive solutions $\mathrm{A}, \mathrm{B}, \mathrm{C}, \mathrm{D}$ and $\mathrm{E}$ when tested with universal indicator showed $\mathrm{pH}$ as $4,1,11,7$ and 9 , respectively. Which solution is
(a) neutral?
(b) strongly alkaline?
(c) strongly acidic?
(d) weakly acidic?
(e) weakly alkaline?
Arrange the $\mathrm{pH}$ in increasing order of hydrogen-ion concentration.
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Sign up nowEqual lengths of magnesium ribbons are taken in test tubes A and B. Hydrochloric acid $(\mathrm{HCl})$ is added to test tube $\mathrm{A}$, while acetic acid $\left(\mathrm{CH}_{3} \mathrm{COOH}\right)$ is added to test tube B. Amount and concentration taken for both the acids are same. In which test tube will the fizzing occur more vigorously and why?
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Sign up nowFresh milk has a pH of 6 . How do you think the $\mathrm{pH}$ will change as it turns into curd? Explain your answer.
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Sign up nowA milkman adds a very small amount of baking soda to fresh milk.
(a) Why does he shift the $\mathrm{pH}$ of the fresh milk from 6 to slightly alkaline?
(b) Why does this milk take a long time to set as curd?
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Sign up nowPlaster of Paris should be stored in a moisture-proof container. Explain why?
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Sign up nowWhat is a neutralisation reaction? Give two examples.
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Sign up nowGive two important uses of washing soda and baking soda.
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Sign up nowThe blue-colored copper sulfate crystals turn white when treated with sulfuric acid. This is due to the nature of the acid.
A) dehydrating
B) oxidizing
C) reducing
D) color changing
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Sign up nowExtra Questions - Acids, Bases and Salts | NCERT | Science | Class 10
Calculate the molarity of $\mathrm{KOH}$ in a solution prepared by dissolving $5.6 \mathrm{g}$ in enough water to form $500 \mathrm{mL}$ of solution.
A) $2 \mathrm{M}$
B) $0.2 \mathrm{M}$
C) $5.6 \mathrm{M}$
D) $500 \mathrm{M}$
The correct answer is Option B: $0.2 \mathrm{M}$.
Step 1: Calculate the molar mass of $\mathrm{KOH}$.
The atomic masses are as follows: K = 39 g/mol, O = 16 g/mol, H = 1 g/mol.
Therefore, the molar mass of $\mathrm{KOH}$ is: $$ 39 \text{ g/mol} + 16 \text{ g/mol} + 1 \text{ g/mol} = 56 \text{ g/mol} $$
Step 2: Determine the number of moles of $\mathrm{KOH}$.
Use the formula for number of moles, $$ \text{moles} = \frac{\text{mass}}{\text{molar mass}} = \frac{5.6 \text{ g}}{56 \text{ g/mol}} = 0.1 \text{ mol} $$
Step 3: Calculate the molarity of the solution.
Convert the solution volume from milliliters to liters: $$ 500 \text{ mL} = 500 \times 10^{-3} \text{ L} = 0.5 \text{ L} $$
Molarity is calculated as: $$ \text{Molarity} = \frac{\text{Number of moles}}{\text{Volume of solution in liters}} = \frac{0.1 \text{ mol}}{0.5 \text{ L}} = 0.2 \text{ M} $$
Thus, the molarity of the $\mathrm{KOH}$ solution is 0.2 M.
State whether true or false: There are two types of salts of $\mathrm{CO}_{2}$.
A) True
B) False
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Sign up now"When water is added to magnesium oxide, magnesium hydroxide is produced, which is also present in lime water. So, is it correct that the magnesium hydroxide present in lime water and the magnesium hydroxide formed from magnesium oxide and water are one and the same?"
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Sign up nowNitric acid turns blue litmus red.
A) True
B) False
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Sign up nowBaking soda is which type of salt?
A. Basic salt
B. Acidic salt
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Sign up nowOn what factors does the strength of an acid depend?
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Sign up nowTaj Mahal is badly affected by acid rain. This is because:
A. Taj Mahal is made of marble.
B. Acid rain attacks the steel structure of Taj Mahal.
C. Acid rain has a pH above 5.6.
D. The paint on Taj Mahal is soluble in acids.
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Sign up nowCleansing action of soap is due to the formation of micelles.
A. True
B. False
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Sign up now"Some crops are suitable for growing in soil with acidic nature. Which salt can be added in order to increase the acidic nature of the soil?
A) Sodium hydroxide
B) Milk of Magnesia
C) Slaked lime
D) Ammonium sulphate"
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