Acids Bases and Salts Test

Result

Acids Bases and Salts Test - 14

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Question 1
1 / -0

China rose is which type of indicator?

A
Olfactory indicator

B
Synthetic indicator

C
Natural indicator

D
None of the above

Solution

Soak some petals of china rose in warm water for a couple of hours. The red-colored solution is used as an indicator for detecting an acid or a base solution. It turns into magenta in an acidic medium and green in a basic medium. Hence, it is a natural indicator.
Question 2
1 / -0

A solution changes the colour of turmeric paper from yellow to red. The solution is:

A
basic

B
acidic

C
neutral

D
either neutral or acidic

Solution

Turmeric can be used as a natural indicator. Turmeric paper is made by applying turmeric paste to blotting paper. It changes its colour to bright red in basic solutions.
Question 3
1 / -0

Why bee strings are treated by alkaline solutions?

A
Because it is basic in nature.

B
Because it is acidic in nature.

C
Because it is treatable by only alkaline solution.

D
None of these.

Solution

The venom of a honey bee is acidic in nature. So, its effects can be neutralized by bicarbonate of soda such a baking soda or an alkali (basic in nature).
Hence the option B is correct.
Question 4
1 / -0

Honey bee stings and ant bites can be _________ using alkaline medicine such as baking powder.

A
Acidifies

B
Neutralize

C
Prevented

D
None of the above

Solution

The venom of honey bee and ant bites are acidic in nature. So, it's effects can be neutralised by bicarbonate of soda such a baking soda or an alkali (basic in nature).
Question 5
1 / -0

The given figure shows the colour changes in test tubes I, II and III, when China rose indicator is added to them. The respective solutions in test tubes I, II and III are

A
Sugar solution, Lime water, Baking powder

B
Sugar solution, Lemon juice, Vinegar

C
Lime water, Sugar solution, Lemon juice

D
Lemon juice, Sugar solution, Lime water

Solution

China rose indicator turns magenta in acidic solution, no change in neutral solution and green in basic solution. Therefore, test tube I contain an acidic solution (lemon juice), test tube III contains basic solution (lime water). As test tube II shows no change in colour so, it contains a neutral solution (sugar solution).
Question 6
1 / -0

China rose turns acidic solution to ________ and basic solution to ________.

A
red, blue

B
light red, green

C
green, light red

D
dark pink, green

Solution

Soak some petals of china rose in warm water for a couple of hours. The red-coloured solution obtained is used as a natural indicator for detecting an acidic or basic solution.
It turns into magenta (dark pink) in acidic medium and green in basic medium.
Hence the option D is correct.
Question 7
1 / -0

In the titration of ferrous ammonium sulphate and potassium dichromate, the external indicator used is:

A
$$KCNS$$

B
$$NH_{4}CNS$$

C
$$K_{3}[Fe(CN)_{6}]$$

D
$$K_{4}[Fe(CN)_{6}]$$

Solution

The solution will turn yellow with addition of dichromate ions and when ferric ions are produced they will also impart a yellow color to the solution so there is no color change during the reaction and you need some other indicator

The use of potassium ferricyanide($$K_3Fe(CN)_6$$ as an external indicator is the best known example in the titration of iron with dichromate. As long as ferrous ion is present in the titration mixture, the indicator will turn blue on the transfer of solution. The appearance of blue colour is due to the formation of ferroferricyanide (Turnbull’s blue) according to flowing.
Hence option C is correct.
Question 8
1 / -0

What happens to the colour of litmus paper when you put a drop of acid on it?

A
It gets destroyed

B
From red it turns blue

C
From blue it turns red

D
It is unaffected by acid

Solution

Answer:- (C) From blue it turns red
Explanation:-
Blue litmus paper turns red under acidic conditions and red litmus paper turns blue under basic or alkaline conditions, with the color change occurring over the pH range 4.5–8.3 at 25 $$℃$$ (77 $$℉$$).
Question 9
1 / -0

Which one of the following will turn blue-litmus red?

A
Vinegar

B
Lime water

C
Baking soda solution

D
Washing soda solution
Question 10
1 / -0

Using toothpaste in daily life is the example of _________.

A
acidic reaction

B
basic reaction

C
neutralization reaction

D
none of these

Solution

$$\textbf{Concept Applied:}$$ When acid reacts with a base, salt and water are formed and such reactions are called neutralization reactions.

$$\textbf{Correct Option:}$$ C

$$\textbf{Explanation for correct option:}$$
Tooth enamel (calcium phosphate) is the hardest substance in our body and it gets corroded when $$pH$$ falls below $$5.5$$. The saliva present in our mouth is slightly alkaline in nature which increases $$pH$$ to some extent. Toothpaste is alkaline and is used to neutralize excess acid in our mouth and hence prevents tooth decay. This is an example of $$neutralization$$ reaction.

$$\textbf{Conclusion:}$$ Our mouth has acidic $$pH$$ and toothpaste has basic $$pH$$. Using toothpaste in daily life causes a reaction between these two and hence it is a neutralization reaction.

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Re-Attempt Weekly Quiz Competition

Acids Bases and Salts Test - 14

Result

Acids Bases and Salts Test - 14

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SHARING IS CARING

Question 1

Olfactory indicator

Synthetic indicator

Natural indicator

None of the above

Solution

Question 2

basic

acidic

neutral

either neutral or acidic

Solution

Question 3

Because it is basic in nature.

Because it is acidic in nature.

Because it is treatable by only alkaline solution.

None of these.

Solution

Question 4

Acidifies

Neutralize

Prevented

None of the above

Solution

Question 5

Sugar solution, Lime water, Baking powder

Sugar solution, Lemon juice, Vinegar

Lime water, Sugar solution, Lemon juice

Lemon juice, Sugar solution, Lime water

Solution

Question 6

red, blue

light red, green

green, light red

dark pink, green

Solution

Question 7

$$KCNS$$

$$NH_{4}CNS$$

$$K_{3}[Fe(CN)_{6}]$$

$$K_{4}[Fe(CN)_{6}]$$

Solution

Question 8

It gets destroyed

From red it turns blue

From blue it turns red

It is unaffected by acid

Solution

Question 9

Vinegar

Lime water

Baking soda solution

Washing soda solution

Question 10

acidic reaction

basic reaction

neutralization reaction

none of these

Solution

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