Tag: acids and alkalis

Questions Related to acids and alkalis

$ 2H _3PO _4 + 3Na _2CO _3 \rightarrow $
What are the products formed?

chemistry acids and alkalis acids with carbonates reactions of acids and bases properties of acids and bases

  1. $2NaPO _4 + 3H _2O + 3CO _2$

  2. $2Na _3PO _4 + 3H _2O + 3CO _2$

  3. $2Na _3PO _4 + H _2O + 3CO _2$

  4. $2Na _3PO _3 + 3H _2O + 3CO _2$

Show answer
Correct Option: B
Explanation:

On adding a carbonate to an acid, effervescence from carbon dioxide gas is released along with the formation of water and salt. $CO _2$ turns lime water milky.
Phosphoric acid + sodium carbonate $\rightarrow$ sodium phosphate + water + carbon dioxide
$ 2H _3PO _4 + 3Na _2CO _3 \rightarrow 2Na _3PO _4 + 3H _2O + 3CO _2 $

A solution reacts with crushed egg-shells to give a gas that turns lime-water milky. The solution contains:

chemistry acids and alkalis acids with carbonates reactions of acids and bases properties of acids and bases

  1. $NaCl$

  2. $HCl$

  3. $LiCl$

  4. $KCl$

Show answer
Correct Option: B
Explanation:

Crushed egg shell has composition $CaCO _3$ reacts with acid and gives gas $CO _2$ which turns lime water $(Ca(OH) _2)$ milky by producing $CaCO _3$ again. The acid in given options is $HCl$. 

$CaCO _3 + 2HCl \rightarrow CaCl _2 + CO _2 + H _2O $
$Ca(OH) _2 + CO _2 \rightarrow CaCO _3 + H _2O$

Which of the following represents the products obtained when, $HCl$ reacts with sodium hydrogen carbonate?

chemistry acids and alkalis acids with carbonates reactions of acids and bases properties of acids and bases

  1. $NaCl$, $H _2O$ and $CO _2$

  2. $NaCl$ and $CO _2$

  3. $NaOH$ and $CO _2$

  4. $NaOH$, $H _2O $ and $CO _2$

Show answer
Correct Option: A
Explanation:

When $HCl$ reacts with sodium hydrogen carbonate, the products obtained are $NaCl,$ $H _2O$ and $CO _2$.
$\displaystyle NaHCO _3 + HCl \rightarrow NaCl + H _2O + CO _2$

Which of the following represents the products obtained when $HCl$ reacts with calcium carbonate?

chemistry acids and alkalis acids with carbonates reactions of acids and bases properties of acids and bases

  1. $CaCl _2$, $H _2O$ and $CO _2$

  2. $CaCl _2$ and $CO _2$

  3. $Ca(OH) _2$ and $CO _2$

  4. $Ca(OH) _2$, $H _2O $ and $CO _2$

Show answer
Correct Option: A
Explanation:

When $HCl$ reacts with calcium carbonate, the products obtained are $CaCl _2$, $H _2O$ and $CO _2$.
$\displaystyle CaCO _3 + 2HCl \rightarrow CaCl _2 + H _2O + CO _2$

When an acid reacts with a metal carbonate or metal hydrogen carbonate, it gives the corresponding salt, gas and product. Name the gas and product?

chemistry acids and alkalis acids with carbonates reactions of acids and bases properties of acids and bases

  1. Carbon dioxide, Water

  2. Carbon dioxide, Salt

  3. Hydrogen, Salt

  4. All of the above

Show answer
Correct Option: A
Explanation:

Acid + Metal carbonate  $\longrightarrow$ Salt + Water + Carbon dioxide

CaCO$ _3$ (calcium carbonate-metal carbonate) + 2HCl $\longrightarrow$ CaCl$ _2$ (calcium chloride-salt) + H$ _2$O + CO$ _2$

Choose the correct answer form the alternatives given.
The chemical name of baking soda is

chemistry acids and alkalis acids with carbonates reactions of acids and bases properties of acids and bases

  1. Sodium carbonate

  2. Sodium bicarbonate

  3. Sodium chloride

  4. Sodium nitrate

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Correct Option: B

Basic soil can be corrected by adding:

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

  1. urea

  2. nitric acid

  3. organic manure

  4. formic acid

Show answer
Correct Option: C
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).

Choose the correct answer from the alternatives given :
Uric acid is the chief nitrogenous waste in

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

  1. Frogs

  2. Birds

  3. Fishes

  4. Mankind

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Correct Option: B

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? 

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

  1. $179.4, 820.6$

  2. $820.6, 179.4$

  3. $500, 500$

  4. $474.3, 525.7$

Show answer
Correct Option: A
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.

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 ?

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

  1. $57.29 ml$

  2. $11.67 ml$

  3. $29.17 ml$

  4. $22.92 ml$

Show answer
Correct Option: C
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