Acids Bases and Salts Test

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Acids Bases and Salts Test - 9

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Weekly Quiz Competition

Question 1
1 / -0

In an experiment to test the pH of a given sample using pH paper, four students recorded the following observations :
Sample taken pH paper colour turned to
I. Water Blue
II. Dilute HCl Red
III. Dulite NaOH Blue
IV. Dilute Ethanoic acid Orange
Which one of the above observations is incorrect.

A
I

B
II

C
III

D
IV
Question 2
1 / -0

$X+H_2O\rightarrow Y$ .
$Y$ is used to remove grease stains from woollen clothes. Identify $X$ and $Y$ .

A
$X=HCl, Y=NaOH$

B
$X=NH_4OH, Y=NH_3$

C
$X=NH_3, Y=NH_4OH$

D
None of these

Solution

Ammonia solution is good for removing stains and tarnish and can also repel moths and reduce paint odours. As ammonia reacts with the water, it is dissolved in to produce ammonium ions and hydroxide ions.
Question 3
1 / -0

Antacids contain ___________.

A
weak base

B
weak acid

C
strong base

D
strong acid

Solution

Antacids are consumed when a person suffers from acidity (excessive acid secretion), antacids are composed of weak bases so that they neutralize excess of acid. Strong bases are not used because they are corrosive to body tissue.
Hence the correct answer is option (A).
Question 4
1 / -0

Which of the following is a property of a base ?

A
They taste bitter.

B
They feel soapy when touched.

C
They turn red litmus blue.

D
All of the above.

Solution

Bases taste bitter, have a soapy feel and turn red litmus to blue.
So, the correct option is D.
Question 5
1 / -0

Which one of the following types of medicines is for treating indigestion ?

A
Antibiotic

B
Analgesic

C
Antacid

D
Antiseptic

Solution

Indigestion can lead to a feeling of fullness, burping, heartburn (due to gastric acid reflux), etc. Thus an antacid can neutralize the effect of an excess of acid and hence it can be consumed for some relief from heartburn, indigestion, acidity, etc.
Antibiotics are taken in case of bacterial infections, Analgesic act as painkillers, Antiseptic is to prevent sepsis.
Hence, the correct answer is the option (C).
Question 6
1 / -0

On washing with soap, a turmeric stain on the cloth turns to red because
A. soap solution is alkaline.
B. soap solution is acidic.
C. turmeric contains a natural indicator.
D. turmeric contain litmus.
Select the correct alternative.

A
A and C

B
B and D

C
C and B

D
A and D

Solution

Turmeric is a natural indicator.
It turns red in basic solution whereas in acidic solution it remains yellow.
Question 7
1 / -0

Acids are:

A
sour

B
corrosive

C
turns blue litmus red

D
All of the above

Solution

The word acid comes from the Latin word acere which means sour.
Acids are sour in taste, corrosive, and turns blue litmus red. These all are the properties of acids.
Question 8
1 / -0

The two kinds of litmus paper are:

A
blue and red

B
blue and yellow

C
red and green

D
yellow and red

Solution

Litmus paper is a natural indicator. A blue litmus paper turns red in acidic solutions and red litmus paper turns blue in basic solution.

Blue/red litmus paper does not change color in the presence of a neutral solution.
Question 9
1 / -0

Directions For Questions

Three different substances were taken and tested with litmus paper. The results are given below.

Substance/Litmus X Y Z
Red Litmus Turns blue No change No change
Blue Litmus No change Turns red No change

...view full instructions

What could be the substance X?

A
Acid

B
Base

C
Water

D
None of these

Solution

Litmus paper is a natural indicator which changes red in acids and blue in bases. Compounds that do not affect the color of litmus papers are described as neutral. When the litmus paper changes to blue then the substance is base.
Question 10
1 / -0

The acid used in the making of vinegar is:

A
formic acid

B
acetic acid

C
sulphuric acid

D
nitric acid

Solution

Vinegar is an acidic liquid consisting of acetic acid $(C{H}_{3}COOH)$ and water.
Option B is correct.

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Re-Attempt Weekly Quiz Competition

Sample taken	pH paper colour turned to
I. Water	Blue
II. Dilute HCl	Red
III. Dulite NaOH	Blue
IV. Dilute Ethanoic acid	Orange

Substance/Litmus	X	Y	Z
Red Litmus	Turns blue	No change	No change
Blue Litmus	No change	Turns red	No change

Acids Bases and Salts Test - 9

Result

Acids Bases and Salts Test - 9

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Question 1

I

II

III

IV

Question 2

X=HCl, Y=NaOHX=HCl, Y=NaOHX=HCl, Y=NaOH

X=NH4OH, Y=NH3X=NH_4OH, Y=NH_3X=NH4​OH, Y=NH3​

X=NH3, Y=NH4OHX=NH_3, Y=NH_4OHX=NH3​, Y=NH4​OH

None of these

Solution

Question 3

weak base

weak acid

strong base

strong acid

Solution

Question 4

They taste bitter.

They feel soapy when touched.

They turn red litmus blue.

All of the above.

Solution

Question 5

Antibiotic

Analgesic

Antacid

Antiseptic

Solution

Question 6

A and C

B and D

C and B

A and D

Solution

Question 7

sour

corrosive

turns blue litmus red

All of the above

Solution

Question 8

blue and red

blue and yellow

red and green

yellow and red

Solution

Question 9

Acid

Base

Water

None of these

Solution

Question 10

formic acid

acetic acid

sulphuric acid

nitric acid

Solution

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$X=HCl, Y=NaOH$

$X=NH_4OH, Y=NH_3$

$X=NH_3, Y=NH_4OH$