Acids Bases and Salts Test - 14

When strong acids and bases react with each other they form salt and water. 

In question it is given that the product is salt and water so their reactant would be strong acid and strong base.

$\mathrm{NaOH}+\mathrm{HCl}\to {\mathrm{H}}_2\mathrm{O}+\mathrm{NaCl}$

Hence, option (C) is the correct answer. 

Ammonium hydroxide is a base and is important for several chemical processes especially in the manufacture of mild cleaning agents.

Hence, the option (D) is the correct answer. 

Option (A) and (B) is giving information about the taste of acids and bases which have acere (sour) and bitter taste, respectively.

In Option (C), litmus paper is an indicator which gives us information about acidic and basic solutions by changing its color . Blue litmus paper turns red under acidic conditions and red litmus paper turns blue under basic or alkaline conditions. Hence, this option is giving a mismatching pair.

In option (D), Red cabbage juice is also an indicator. It contains a natural pH indicator that changes colors depending on the acidity of the solution. Very acidic solutions turn the indicator a red color, neutral solutions turn the indicator a purple color, and basic solutions turn the indicator a greenish-yellow color.

Hence, option (C) is the correct answer. 

Tamarind is having tartaric acid and hence option (A) is incorrect.

Soap solution is an alkaline solution so this option (B) is an incorrect answer.

Vinegar is having acetic acid so it  gives litmus paper test for acid and hence the correct option. 

Sugar solution is amphoteric in nature and hence option (D) is also incorrect. 

Hence, option (C) is the correct answer. 

Lemons, oranges, and other citrus fruits are the predominant natural sources of citric acid. 

As we see in the Question that Tartaric Acid and Grapes are related to each other in the form that “Grapes” contain “Tartaric Acid”. Similarly from the above statement it can be inferred that “Oranges” contain “Citric Acid”.

Hence, option (A) is correct.

Since vinegar is acidic in nature, only the test tube (W) will be acidic.

Sodium hydroxide (NaOH) and lime water Ca(OH)₂ are basic in nature.

Salt is formed by the reaction between acids and bases so they are electrically neutral (acid neutralizes bases).

Hence, the correct answer is option (C).

The main use of litmus is to test whether a solution is acidic or basic. Blue litmus paper turns red under acidic conditions and red litmus paper turns blue under basic or alkaline conditions

China rose converts acidic solutions to dark pink, basic solutions to green colour and has no colour change for neutral solutions. China rose is a natural indicator and is used to identify the acidic or basic nature of a solution.

Since, baking soda is an alkaline solution so it turns litmus paper blue , while it turns china rose indicator green colour.

Hence, the correct option is (B).

Natural Indicator is a type of indicator that can be found naturally and can determine whether the substance is an acidic substance or a basic substance. Some examples of natural indicators are red cabbage, turmeric, grape juice, beetroots, etc.

Litmus is a natural indicator which is extracted from a type of plant called lichen. Turmeric and red cabbage are natural indicators. phenolphthalein is a synthetic indicator and is prepared in the laboratory.

Hence, option (C) is the correct answer.

The main use of litmus is to test whether a solution is acidic or basic. Blue litmus paper turns red under acidic conditions and red litmus paper turns blue under basic or alkaline conditions.

Aqueous solution of given question changes blue litmus to red so the solution must be acidic. 

Hence, the correct answer is option (B).

Temporary hardness of water is due to the presence of magnesium and calcium hydrogen carbonate.

Temporary hardness can be removed either by boiling the water, or by the addition of lime (calcium hydroxide).

A calculated amount of lime is added to hard water. It precipitates out calcium carbonate and magnesium hydroxide which can be filtered off. 

Ca(HCO₃)₂ + Ca(OH)₂  →  2CaCO₃ ↓+ 2H₂O

Mg(HCO₃)₂ +  Ca(OH)₂ →   2CaCO3 ↓ + Mg(OH)₂ ↓ + 2H₂O

Hence, option (D) is the correct answer. 

Soaps are sodium or potassium salts of long chain fatty acids. When triglycerides in fat/oil react with aqueous NaOH or KOH, they are converted into soap and glycerol. Since this reaction leads to the formation of soap, it is called the Saponification process.

Hence, option (A) is the correct answer. 

The main use of litmus is to test whether a solution is acidic or basic. Blue litmus paper turns red under acidic conditions and red litmus paper turns blue under basic or alkaline conditions.

Lime water is basic in nature so it can turn red litmus paper to blue.

Hence, option (A) is the correct answer. 

Phenolphthalein is often used as an indicator in acid–base titrations. For this application, it turns colorless in acidic solutions and pink in basic solutions.

Since, KOH is basic in nature so phenolphthalein turns pink in colour. 

Hence, the correct answer is option (B).

Vitamin C, also known as ascorbic acid, is a water-soluble nutrient found in some foods (orange, lemon juice and amla etc.) . In the body, it acts as an antioxidant, helping to protect cells from the damage caused by free radicals.

Hence the correct option is (D).

Acid neutralises base and vice-versa.

Since, wasp stings are basic. So if you get stung you need to put  vinegar on a wasp sting. The acidity of the vinegar helps neutralise the wasp venom(basic nature).

Hence, option (A) is the correct answer.