Tag: neutralisations in everyday life

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Multiple choice chemistry acids and alkalis neutralisations in everyday life acids and bases in daily life neutralisation reaction

Basic soil can be corrected by adding:

  1. urea

  2. nitric acid

  3. organic manure

  4. formic acid
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Plants can neither grow in too acidic conditions nor grow in too basic conditions. Thus for the proper growth of the plant optimum pH of the soil has to be maintained.


If the soil is too basic then it can be corrected by using organic manure. Compost micro-organisms operate best under neutral to acidic conditions with their pH ranging from 5.8 to 8. 


Thus they not only help in maintaining the pH of the soil but also increase the nutrient availability and improve the quality of the soil (unlike inorganic chemical fertilizers which damage the soil quality). 

Thus organic manure creates acidic conditions, which help in neutralizing the basic soil and makes the pH optimum for plant growth.

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

Multiple choice chemistry acids and alkalis neutralisations in everyday life acids and bases in daily life neutralisation reaction

A 26 ml of $ N-Na _{2}CO _{3} $ solution is neutralized by the solutions of acids A and B in different experiments. The volumes of the acids A and B required were $10 ml$ and $40 ml$, respectively. How many volumes of A and B are to be mixed in order to prepare 1 litre of normal acid solution? 

  1. $179.4, 820.6$
  2. $820.6, 179.4$
  3. $500, 500$
  4. $474.3, 525.7$
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

$ N _{1}V _{1} (Na _{2}CO _{3}) = N _{2}V _{2} (A)$
$ N _{1}V _{1} (Na _{2}CO _{3}) = N _{2}V _{2}(B)$
$ N _{1} = 1 , V _{1} = 26ml, V _{2} = 10ml, V _{3} = 40ml$
Normality of A
$ N _{2} = \dfrac{N _{1}V _{1}}{V _{2}} = \dfrac{1 \times 26}{10} = 2.6 N $
Normality of B
$ N _{3}= \dfrac{N _{1}V _{1}}{V _{3}} = \dfrac{1 \times 26}{40} = 0.65 N $
if we mix A & B then
$ N _{1}V _{1} + N _{2} V _{2} = N _{3} (V _{1}+V _{2})$
$ 2.6 V _{1}+0.65V _{2} = 1 \times 1000 $
$ 2.6V _{1}+ V _{2} + 0.65 V _{2} = 1000 ...(1)$
$ V _{1}+V _{2} =1000 ...(2)$
multiply $eq^{n}$ (2) by 0.65 
$ 0.65 V _{1}+0.65V _{2} = 650 ...(3)$
$ V _{2} = 820.6 ml$
$ V _{1} = 1000 - 820.6 = 179.4 ml $
option "a" correct.

Multiple choice chemistry acids and alkalis neutralisations in everyday life acids and bases in daily life neutralisation reaction

What volume of $ 0.18 N - KMnO _{4} $ solution would be needed for complete reaction with 25 ml of $ 0.21 N - KNO _{2} $ in acidic medium ?

  1. $57.29 ml$
  2. $11.67 ml$
  3. $29.17 ml$
  4. $22.92 ml$
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

$ KMnO _{4}+KNO _{2}$
$ 0.18 N $ 25 ml
V = ? 0.21 N
we know $ N _{1}V _{1}= N _{2}V _{2}$
$ 0.18 \times V _{1} = 0.21 \times 25 $
$ V _{1} = \dfrac{0.21 \times 25}{0.18 }$
$ \boxed{V _{1} = 29.17 ml}$
Answer option C

Multiple choice chemistry acids and alkalis neutralisations in everyday life acids and bases in daily life neutralisation reaction

Which one of the following types of medicines is for treating indigestion ? 

  1. Antibiotic

  2. Analgesic

  3. Antacid

  4. Antiseptic
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Indigestion can lead to a feeling of fullness, burping, heartburn (due to gastric acid reflux), etc. Thus an antacid can neutralize the effect of an excess of acid and hence it can be consumed for some relief from heartburn, indigestion, acidity, etc.

Antibiotics are taken in case of bacterial infections, Analgesic act as painkillers, Antiseptic is to prevent sepsis.
Hence, the correct answer is the option (C).

Multiple choice chemistry introduction to acid and base neutralisations in everyday life acids and bases in daily life neutralisation reaction

Calcium hydroxide (slaked lime) is used in :

  1. plastics and dyes

  2. fertilizers

  3. antacids

  4. white washing
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Calcium hydroxide called slaked lime is an inorganic compound. It is a colorless crystal and is obtained when calcium oxide is mixed with water. It is used in preparation of dry mixes for painting and white washing.

Multiple choice chemistry introduction to acid and base neutralisations in everyday life acids and bases in daily life neutralisation reaction

Caustic soda is the common name for:

  1. $\displaystyle { Mg\left( OH \right) } _{ 2 }$
  2. $\displaystyle KOH$
  3. $\displaystyle { Ca\left( OH \right) } _{ 2 }$
  4. $\displaystyle NaOH$
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Caustic soda is sodium hydroxide which is a strong base and so it has high basicity value on $pH$ scale. It is widely used in acid-base titrations to neutralize various strong or weak acids like sulfuric acid.


Hence, the correct option is $\text{D}$

Multiple choice chemistry introduction to acid and base neutralisations in everyday life acids and bases in daily life neutralisation reaction

Soda water contains :

  1. carbonic acid

  2. sulphuric acid

  3. carboxylic acid

  4. nitrous acid
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Soda water is carbonated water. It contains water into which carbon dioxide gas under pressure has been dissolved. It is carbonic acid. The vast majority of carbonated water is sold in drink bottles as soft drinks and beverages.