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Ch 2 Acid and bases with metals for class 10
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Available practice questions
Ch 2 IMP question for Science class 10
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Some examples from this set of practice questions
1.
What do you understand by olfactory indicators?
Answer: Ans Some indicators show a change in their odor in the presence of acids or bases. Such indicators are called olfactory indicators. They are very useful for visually challenged students because such students cannot use other indicators. Clove, vanilla, and onion are examples of olfactory indicators.
2.
A dry pellet of a common base B absorbs moisture and turns sticky when kept open. The compound is also a by-product of the chloralkali process. Identify B. What type of reaction occurs when B is treated with an acidic oxide? Write a balanced chemical equation for one such solution.
Answer: Sodium hydroxide (NaOH) is a commonly used base and is hygroscopic; it absorbs moisture from the atmosphere and becomes sticky. A neutralization reaction occurs when acidic oxides react with the base to give salt and water. 2 NaOH + CO2 → Na2CO3 + H2O
3.
What is the common name of the compound CaOCl2 ?
Answer: Ans The common name of the compound CaOCL2 is bleaching power.
4.
What is a neutralisation reaction ? Give a examples.
Answer: Ans When an acid reacts with a base, then salt and water are formed. This is called neutralisation reaction. Acid + Base → Salt + Water Ex NaOH(aq)+HCl(aq)→NaCl(aq)+H2O(l)
5.
What is salt ?
Answer: Salt is formed through the combination of an anion derived from an acid and a cation derived from a base. Examples of salts include KCl, NaNO3, CaSO4, and others.
Content preview
, Acids, Bases and SaltsAcids Bases
Sour in tasteDerived from Greek
Bitter in taste
word’ ACIDUS’
Changes blue litmus into red Changes red litmus into blue
e.g. Hydrochloric acid HCl e.g. Sodium hydroxide NaOH
Sulphuric acid Potassium hydroxide KOH
Nitric acid Calcium hydroxide
Acetic acid Ammonium hydroxide
Acid-Base Indicators:
Natural indicators like litmus, turmeric, red cabbage leaves, and colored petals
from flowers like Hydrangea, Petunia, and Geranium can show acidity or alkalinity.
On the other hand, synthetic indicators such as methyl orange and
phenolphthalein are also used for the same purpose.
Some naturally occurring acids
Vinegar Acetic Acid
Orange Citric Acid
Lemon Citric Acid
Tamarind Tartaric Acid
Tomato Oxalic Acid
Sour milk (Curd) Lactic Acid
Ant and Nettle sting Methanoic Ac
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