Acids Bases and Salts Test

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Acids Bases and Salts Test - 39

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Weekly Quiz Competition

Question 1
1 / -0

Name of the organic acid present in tomato is :

A
tartaric acid

B
malic acid

C
lactic acid

D
oxalic acid

Solution

Tomato has oxalic Acid (there are other acids like citric acid and ascorbic acid which are also present in tomato ).

So among the options, oxalic acid is the only acid present in tomatoes.

Hence the option D is correct.
Question 2
1 / -0

Curd taste sour because this is a/an :

A
base

B
salt

C
acid

D
liquid

Solution

The bacteria Lactobacillus (present in a small quantity) when added to a large amount of milk, converts lactose to lactic acid, which makes the curd sour in taste.

Hence the option $$C$$ is correct.

Question 3

1 / -0

Match the column I with column II and mark the appropriate choice.

	Column I		Column II
(A)	$$Na_2CO_3$$	(i)	Caustic soda
(B)	$$NaOH$$	(ii)	Glauber's salt
(C)	$$Na_2CO_3.10H_2O$$	(iii)	Soda ash
(D)	$$Na_2SO_4.10H_2O$$	(iv)	Washing soda

$$(A)\rightarrow (iv), (B)\rightarrow (i), (C) \rightarrow (ii), (D)\rightarrow (iii)$$

$$(A)\rightarrow (iv), (B)\rightarrow (i), (C) \rightarrow (iii), (D)\rightarrow (ii)$$

$$(A)\rightarrow (ii), (B)\rightarrow (iii), (C) \rightarrow (iv), (D)\rightarrow (i)$$

$$(A)\rightarrow (iii), (B)\rightarrow (i), (C) \rightarrow (iv), (D)\rightarrow (ii)$$

Solution

$$ { Na }_{ 2 }C{ O }_{ 3 } $$ is commonly known as Soda ash.

$$ NaOH $$ is commonly known as Caustic soda.

$$ { Na }_{ 2 }C{ O }_{ 3 }.10{ H }_{ 2 }O $$ is commonly known as Washing soda.

$$ { Na }_{ 2 }S{ O }_{ 4 }.10{ H }_{ 2 }O $$ is commonly known as Glauber's salt.

Question 4
1 / -0

When kept in the open air, the crystals of washing soda lose nine molecules of water to form a monohydrate.

$$Na_2CO_3 . 10H_2O \xrightarrow[to\, air]{exposed}Na_2CO_3.H_2O + 9H_2O$$

This process is called:

A
efflorescence

B
deliquescence

C
dehydration

D
hydration

Solution

The process of losing water of crystallization from hydrated salt when exposed to air is called efflorescence.
Hydration means the addition of water, and dehydration means the removal of water.
Deliquescence means tending to become a liquid.
Question 5
1 / -0

Choose the correct answer from the alternatives given.

The human stomach produces acid $$X$$ which helps in the digestion of food. Acid $$X$$ is _______.

A
acetic acid

B
methanoic acid

C
hydrochloric acid

D
citric acid

Solution

The human stomach produces hydrochloric acid. It helps our body to break down, digest, and absorb nutrients such as protein. It also eliminates bacteria and viruses in the stomach, protecting your body from infection. Low levels of hydrochloric acid can have a profound impact on the body's ability to properly digest and absorb nutrients.

So, acid $$X$$ is hydrochloric acid $$(HCl)$$.

Thus, option C is correct.
Question 6
1 / -0

Phenolphthalein is a synthetic indicator and its color in acidic and basic solutions, respectively are:

A
red and blue

B
blue and red

C
pink and colorless

D
colorless and pink

Solution

Phenolphthalein is a type of synthetic indicator which is colourless in acidic medium but gives pink colour in basic medium.
Question 7
1 / -0

Barium hydroxide is an alkali. It reacts with hydrochloric acid. How does the pH of the hydrochloric acid change as an excess of aqueous barium hydroxide is added?

A
The $$pH$$ decreases from $$pH\ 14$$ and becomes constant at $$pH\ 7$$

B
The $$pH$$ decreases from $$pH\ 14$$ to about $$pH\ 1$$

C
The $$pH$$ increases from $$pH\ 1$$ and becomes constant at $$pH\ 7$$

D
The $$pH$$ increases from $$pH\ 1$$ to about $$pH\ 14$$
Solution
- The $$pH$$ increases from $$pH \; 1$$ to about $$pH \; 14$$. As the $$pH$$ of an acid is less than $$7$$ while the $$pH$$ of a base is greater than $$7$$.
- $$Ba{\left( OH \right)}_{2}$$ is basic in nature and $$HCl$$ is acidic.
- Hence, when excess of aqueous barium hydroxide is added to hydrochloric acid, the $$pH$$ of hydrochloric acid will increase from $$1$$ to about $$14$$. It will not become constant at $$pH\ 7$$ as it will not become neutral.
Question 8
1 / -0

Baking soda is not used:

A
in baking.

B
as an ingredient in antacids.

C
in fire- extinguishers.

D
as a disinfectant.

Solution

Baking powder is a mixture of baking soda (sodium hydrogen carbonate) and a mild edible acid such as tartaric acid. Sodium hydrogen carbonate is an ingredient in antacids. It is used for baking as it causes the dough to rise by producing carbon dioxide. Being alkaline, it neutralises excess acid in the stomach and provides relief and it is also used in soda-acid fire extinguishers.
However, it is not used as a disinfectant, thus, option $$D$$ is correct.
Question 9
1 / -0

The $$pH$$ of rain water is approximately_____.

A
6.5

B
7.5

C
5.6

D
7.0

Solution

Rainwater becomes acidic because gases present in the environment are dissolved so its $$pH$$ will be less than 7. $$pH$$ of rainwater is approximate $$5.6$$.
Question 10
1 / -0

'Litmus', a natural dye is an extract of which of the following?

A
China rose (Gudhal)

B
Beetroot

C
Lichen

D
Blue berries (Jamun)

Solution

Litmus', a natural dye is extracted from Lichen which is a composite organism that emerges from algae.

Hence, option $$C$$ is correct.

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Re-Attempt Weekly Quiz Competition

Acids Bases and Salts Test - 39

Result

Acids Bases and Salts Test - 39

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SHARING IS CARING

Question 1

tartaric acid

malic acid

lactic acid

oxalic acid

Solution

Question 2

base

salt

acid

liquid

Solution

Question 3

$$(A)\rightarrow (iv), (B)\rightarrow (i), (C) \rightarrow (ii), (D)\rightarrow (iii)$$

$$(A)\rightarrow (iv), (B)\rightarrow (i), (C) \rightarrow (iii), (D)\rightarrow (ii)$$

$$(A)\rightarrow (ii), (B)\rightarrow (iii), (C) \rightarrow (iv), (D)\rightarrow (i)$$

$$(A)\rightarrow (iii), (B)\rightarrow (i), (C) \rightarrow (iv), (D)\rightarrow (ii)$$

Solution

Question 4

efflorescence

deliquescence

dehydration

hydration

Solution

Question 5

acetic acid

methanoic acid

hydrochloric acid

citric acid

Solution

Question 6

red and blue

blue and red

pink and colorless

colorless and pink

Solution

Question 7

The $$pH$$ decreases from $$pH\ 14$$ and becomes constant at $$pH\ 7$$

The $$pH$$ decreases from $$pH\ 14$$ to about $$pH\ 1$$

The $$pH$$ increases from $$pH\ 1$$ and becomes constant at $$pH\ 7$$

The $$pH$$ increases from $$pH\ 1$$ to about $$pH\ 14$$

Solution

Question 8

in baking.

as an ingredient in antacids.

in fire- extinguishers.

as a disinfectant.

Solution

Question 9

6.5

7.5

5.6

7.0

Solution

Question 10

China rose (Gudhal)

Beetroot

Lichen

Blue berries (Jamun)

Solution

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