Acids

Q.

Acids are _____ in taste.

1. sweet

2. bitter

3. salty

4. sour

Q. What is difference betwee common tap water and distilled wayer on pH scale?

Q.

What is pH value of a substance?

Q.

Match the following acids with the food substance in which they are present.

(a) Buttermilk (b) Vinegar (c) Tamarind (d) Lemon

(i) Tartaric Acid (ii) Acetic Acid (iii) Citric Acid (iv) Lactic Acid

1. (a)- iv, (b)- ii (c)- (i) and d- (iii)

2. (a)- ii, (b)- iii (c)- (i) and d- (iv)

3. (a)- iii, (b)- ii (c)- (iv) and d- (i)

4. (a)- i, (b)- ii (c)- (iv) and d- (iii)

Q.

What is the nature of the substance with tastes bitter?

1. Acidic

2. Basic

3. Neutral

4. Can't be determined

Q. Which of the following is incorrect about acid rain?

1. Damages monuments
2. Helps the plant growth
3. Harmful for animals
4. Damages buildings

Q. Tartaric acid is an example of a natural acid.

1. True
2. False

Q.

In order to dilute a concentrated acid, should water be added to the acid or acid be added to the water? Explain your choices.

Q.

Sting of ants and bees contain_______________.

1. Formic acid

2. Vinegar

3. Common salt

4. Acetic acid

Q.

Which of the following is not a property of an acid?

1. Acids turn blue litmus red

2. Acids taste sour

3. Acids turn red litmus blue

4. The chemical nature of acid is acidic

Q. The proteins in our body is made up of _______.

1. citric acid
2. formic acid
3. amino acid
4. acetic acid

Q. Which of the following is responsible for corroding the marbles of Tajmahal?

1. Air pollution
2. Soil pollution
3. Water pollution
4. Noise pollution

Q. Which of the following acids are mineral acids?

1. $\text{HCl}$
2. ${\text{H}}_2{\text{SO}}_4$
3. ${\text{HNO}}_3$
4. ${\text{CH}}_3\text{COOH}$

Q. Nitrogen dioxide reacts with water to give :

1. sulphuric acid
2. nitric acid
3. nitrogen
4. carbon dioxide

Q.

Which of the following substance is not sour to taste?

2. Alum

3. Raw mango

4. Tamarind

Q.

Which one of the following is acidic?

1. 
   Lemon juice
2. 
   Tomatoes
3. 
   Grapes
4. 
   

   All

Q.

Which of the following is an acidic-base indicator?

1. Vinegar

2. Lime water

3. Turmeric

4. Baking soda

Q.

Define olfactory indicator. Write the use of onion extract to distinguish between sodium hydroxide solutions and dilute hydrochloric acid.

Q.

Assertion: Phenolphthalein is an acid-base indicator.

Reason: The aqueous solution of a base NaOH is pinkish and it becomes colorless when dilute HCl is added dropwise to the solution.

1. Both assertion and reason are correct and the reason is the correct explanation of the assertion.

2. Both assertion and reason are correct but the reason is not the correct explanation of the assertion.

3. The assertion is correct but the reason is incorrect.

4. The assertion is incorrect but the reason is correct.

Q. This section contains 1 Assertion-Reason type question, which has 4 choices (a), (b), (c) and (d) out of which ONLY ONE is correct.
इस खण्ड में 1 कथन-कारण प्रकार का प्रश्न है, जिसमें 4 विकल्प (a), (b), (c) तथा (d) दिये गये हैं, जिनमें से केवल एक सही है।

A : Hydrochloric acid reacts with sodium hydroxide to produce a salt.
A : हाइड्रोक्लोरिक अम्ल की सोडियम हाइड्रॉक्साइड के साथ अभिक्रिया पर लवण प्राप्त होता है।

R : The reaction between an acid and a base is known as neutralisation reaction.
R : अम्ल तथा क्षार के मध्य अभिक्रिया, उदासीनीकरण अभिक्रिया कहलाती है।

1. Both (A) and (R) are true and (R) is the correct explanation of (A)
   
   (A) तथा (R) दोनों सही हैं तथा (R), (A) का सही स्पष्टीकरण है
2. Both (A) and (R) are true but (R) is not the correct explanation of (A)
   
   (A) तथा (R) दोनों सही हैं लेकिन (R), (A) का सही स्पष्टीकरण नहीं है
3. (A) is true but (R) is false
   
   (A) सही है लेकिन (R) गलत है
4. (A) is false but (R) is true
   
   (A) गलत है लेकिन (R) सही है

Q.

The solutions which show a pH in the range 7 to 14 are _________ in nature.

1. Basic

2. Amphoteric

3. Acidic

4. Neutral

Q. Methyl orange turns _____ in an acidic medium and _____ in basic medium.

1. red, yellow
2. yellow, red
3. green, red
4. yellow, orange

Q.

It’s a hot sunny day and Sushweta is very thirsty, so she goes inside the kitchen to make a drink for herself. She accidentally pours some edible acidic solution into water and drinks it. What would be the taste of the drink?

1. Sweet

2. Bitter

3. Tasteless

4. Sour

Q. Lemons and vinegar are acidic in nature. They taste .

1. sour
2. bitter
3. salty

Q. Choose the odd one out of the following:​

1. Vinegar​
2. Toothpaste
3. Milk
4. Lemon

Q. <!--td {border: 1px solid #cccccc;}br {mso-data-placement:same-cell;}--> What is an acidic radical? Give a few examples.

Q. Which of the following is incorrect about acid rain?

1. Damages monuments
2. Helps the plant growth
3. Harmful for animals
4. Damages buildings

Q.

Acid rain can damage.

1. Crops

2. Soil

3. Buildings

4. All the options are correct.

Q.

What is the colour of methyl orange in acidic and basic solutions?

Q. Define acid rain. Write any three hazardous effects of acid rain.