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प्रश्न
Define a base.
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उत्तर
A base is defined as a chemical compound that, when it reacts with a hydronium ion or H+ ions furnished by an acid, forms a salt and water only.
संबंधित प्रश्न
Name the source from which litmus solution is obtained. What is the use of this solution?
Name the gas evolved when dilute HCl reacts with sodium hydrogencarbonate. How is it recognised?
What is meant by strong acids?
Why do HCl, H2SO4, HNO3, etc., show acidic character in aqueous solutions while solutions of compounds like C6H12O6 (glucose) and C2H5OH (alcohol) do not show acidic character?
Why is it wrong to treat a wasp sting with baking soda solution?
Which acid is produced in our stomach? What happens if there is an excess of acid in the stomach? How can its effect be cured?
The soil in a field is highly acidic. Name two materials which can be added to this soil to reduce its acidity. Give the reason for your choice.
What happens when bases react with non-metal oxides? Explain with the help of an example. What does this reaction tell us about the nature of non-metal oxides?
The salt which will give a neutral solution on dissolving in water will be ______.
Define the term ‘basicity’ of an acid.
Give two examples of the following:
oxy-acid
Write balanced equation to satisfy the following statement:
\[\ce{Acid + Active metal -> Salt + hydrogen}\]
State one observation for each of the following :
A small piece of zinc is added to dilute hydrochloric acid
Write the chemical name from the given formula.
H2SO4
Explain, all alkalis are bases but all bases are not alkalis.
What do you understand by the strength of an acid? On what factors does the strength of an acid depend?
Write the balanced equation for the preparation of the following compound (as major product) starting from iron and using only one other substance:
Iron (III) chloride
Acids are ________ in taste.
Acid mixed with base forms ______.
The word sour refers to ______ in Latin.
An aqueous solution turns red litmus solution blue. Excess addition of which of the following solutions would reverse the change?
Match the chemical substances given in Column (A) with their appropriate application given in Column (B)
| Column (A) |
Column (B) |
| (A) Bleaching powder | (i) Preparation of glass |
| (B) Baking soda | (ii) Production of H2 and Cl2 |
| (C) Washing Soda | (iii) Decolourisation |
| (D) Sodium chloride | (iv) Antacid |
While playing in a park, a child was stung by a wasp. Some elders suggested applying paste of baking soda and others lemon juice as remedy. Which remedy do you think is appropriate and why?
The Acid secreted in our stomach is ______.
Curd contains ______ acid.
Complete the following equation.
Mg+ ______ → ______ + H2.
Complete the following equation.
Ca(OH)2 + ______ → ______ + H2O
The acid which contains four hydrogen atoms is ______.
Name the acid present in lemon.
In a set of the given reactions, acetic acid yielded a product C.
\[\begin{array}{cc}
\phantom{}\ce{\underset{}{CH3COOH + PCl5} ->[][ ] \underset{}{A}->[C6H6][anhy.AlCl3 ] \underset{}{B}->[C2H5MgBr][Ether] \underset{}{C}}\\
\end{array}\]
Product C would be:
