Test: Acids, Bases And Salts - 3 - RRB Group D / RPF Constable MCQ

The solution which turns red litmus blue is basic. Its pH should be greater than 7. Therefore, the correct answer is (d).

The solution is HCl.
Egg shells contains calcium carbonate, which on reaction with HCl liberates CO₂ gas which turn lime water to milky.
CaCO₃ + 2HCl → CaCl₂ + H₂O + CO2

Since 10 mL of NaOH solution requires 8 mL of HCl solution

Therefore, 20 mL of NaOH solution will require 8 x 2 = 16 mL of HCl solution

Because of over eating our stomach produce more acid, which is generally resulting in indigestion. Thus, to neutralize excess acid produced by stomach antacid is taken as medicine. Thus answer is (c) Antacid

According to Arrhenius, an acid. Is a substance which dissociates into H⁺ ion in water.

Milk of Magnesia is a brand name for magnesium hydroxide, a medication used to treat constipation. Milk of Magnesia can also be used as an antacid. It can help relieve heartburn, sour stomach, and acid indigestion.

Aqua regia is a highly corrosive mixture of hydrochloric acid (HCl) and nitric acid (HNO3) in a molar ratio of 3:1 or 4:1. The name “aqua regia” translates from Latin to mean “king’s water” or “royal water,” referring to the acid’s ability to dissolve the noble metals gold, platinum, and palladium.

Ch₃COOH is weak acid as it dissociates only slightly in water.

Soda ash, also known as sodium carbonate (Na₂CO₃), is an alkali chemical compound

Salt of weak acid and strong base: CH₃COONa is a salt of weak acid CH₃COOH and strong base NaOH. When it is dissolved in water it dissociates completely. ions of water get trapped and the pH of solution increases.

The reaction between acid and base
It is a neutralization reaction which forms a salt but the base is not formed.

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. This is called alkaline hydrolysis of esters. 

Potash alum is used in the purification of water. Potash alum, K₂SO₄, AI₂(SO₄) ₃, 24H₂O, is an example of a double salt.

The chemical name of NaHCO₃ is sodium bicarbonate. This ionic compound is a common household product, otherwise known as baking soda. 

Blue vitriol is copper sulphate Pentahydrate 
CuSO4. 5H2O . It has 5 moles of water. 
Gypsum is calcium sulphate dihydrate 
CaSO4. 2H2O . It has two moles of water.
The chemical formula of Epsom salt is magnesium sulfate  MgSO4(H2O) x, where x varies from 0 to 7.Glauber's salt is the Decahydrate form of sodium sulfate.  NaSO4. 10H2O.

Since soap solution is basic, phenolphthalein turns pink in pink solution.

The indigestion is due to excess of acid produced in the stomach. The medicine used to neutralise it is called antacid 

The baking soda i.e, NaHCO₃ does not contain water of crystallization.

Calcium hydroxide (traditionally called slaked lime) is an inorganic compound with the chemical formula Ca(OH)₂

Non-metals react with oxygen in the air to produce non-metal oxides.

 Nature of non metallic oxide is  acidic in nature , unlike of metallic oxides which are found to be basic in nature.

When acid is dissolved in water, it dissociates into ions and thus it conducts electricity due to presence of ions. But alcohol and glucose being very weak acid do not dissociate into ions and thus, do not conduct electricity.

 The main organic acids contained in the flesh of lemons are citric acid and malic acid. The sourness of citrus fruit is the taste of citric acid.

PH paper indicates the various levels of hydrogen ion concentration.

When concentrated acid is added to water, the strong bonds of acid are broken and they dissociate into ions, thus releasing a large amount of energy in the form of heat.
Thus, the reaction is exothermic.

On heating it forms sodium carbonate (Na₂CO₃), B and CO₂ gas, C is evolved. When CO₂ gas is passed through lime water it forms calcium carbonate (CaCO₃), which is slightly soluble in water making it milky.