Q: Write three differences between acids and bases.

Difference between acids and bases:\$Acids\$ \$Bases\$1. Sour in taste 1. Bitter in taste2. Change blue litmus red 2. Change red litmus blue3. Not soapy to touch 3. Soapy to touch

Q: A substance that dissolves in water to furnish \$\displaystyle H^{+}\$ ions is called an acid.

\$\textbf{True}\$A substance that dissolves in water to furnish or to give \$H^+\$ ions is called an acid.For example, \$HCl + H_2O \longrightarrow H^+ + Cl^-\$

Question 1

Which comparison is not correct as indicated?

Accepted Answer

Toppr Ask Answer

Question 2

What is an acid? Write some of the properties of acids.

Accepted Answer

Curd, lemon juice, orange juice and vinegar taste sour. These substances taste sour because they contain acids. The chemical nature of such substances is acidic. The word acid comes from the Latin word $acere$ which means sour.Some of the properties of acids are: Acids change the colour of litmus from blue to red. Some acids are highly corrosive in nature Acids tend to evolve hydrogen gas whilst reacting with metals.

Question 3

Write three differences between acids and bases.

Accepted Answer

Difference between acids and bases:$Acids$                                          $Bases$1. Sour in taste                              1. Bitter in taste2. Change blue litmus red           2. Change red litmus blue3. Not soapy to touch                  3. Soapy to touch

Question 4

Which of the following is not a property of acid?

Accepted Answer

A. True. They are sour in taste.B. True. They turn blue litmus to red.C. False. Turmeric remains yellow in an acidic medium. It does not change color.

Question 5

You are provided with four test tubes containing sugar solution, baking soda solution, tamarind solution, salt solution. Write down an activity to find the nature (acidic/basic/neutral) of each solution.

Accepted Answer

By tasting the solution present in test tube, we can identify the nature (acidic/basic/neutral) of each solution. Sugar solution: The taste of sugar solution will be sweet. Its taste is not sour or bitter. So, it comes in the category of neutral solution.Baking soda solution: The taste of baking soda solution will be bitter. So, it comes in the category of basic solution.Tamarind solution: The taste of tamarind solution will be sour. So, it comes in the category of acidic solution.Salt solution: The taste of salt solution will be salty. Its taste is not sour or bitter. So, it comes in the category of neutral solution.

Question 6

Match the substances in Column I with those in Column II

Column I Column II
a) Tartaric acid i) Soap
b) Calcium hydroxide ii) curd
c) Formic acid iii) Unripe mangoes
d) Sodium hydroxide iv) Ant's sting
e) Lactic acid v) Lime water

Accepted Answer

The correct table is given below:Column I   Column IIa) Tartaric acidi) Unripe mangoesb) Calcium hydroxide     ii) Lime waterc) Formic acidiii) Ant's stingd) Sodium hydroxideiv) Soapd) Lactic acidv) curd

Question 7

State whether the following statement is true or false, correct if false.All substances are either acidic or basic.

Accepted Answer

The given statement is false. The correct statement is:In nature, all substances can be acidic, basic or neutral.

Question 8

Cutting onions taken from fridge is more comfortable than cutting onions at room temperature. Explain why?

Accepted Answer

At low temperature, vapour pressure is low. Also the vapours of the tear producing chemical are less. Hence it is more comfortable to cut onions taken out from the fridge.

Question 9

Which of the following acid is present in the sting of an ant?

Accepted Answer

Ants are also known as Formica in Latin. A string of an ant contains formic acid /methanoic acid and that is why there is a burning and itching sensation after an ant's bite.

Question 10

A substance that dissolves in water to furnish $\displaystyle H^{+}$ ions is called an acid.

Accepted Answer

$\textbf{True}$A substance that dissolves in water to furnish or to give $H^+$ ions is called an acid.For example, $HCl + H_2O \longrightarrow H^+  + Cl^-$

Identifying Acids and Bases Around Us

Language

Rate

REVISE WITH CONCEPTS