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TNPSC General Science - Chemistry - Chemistry in Everyday life Model Questions

TNPSC Chemistry - Chemistry in Everyday life

Exam Duration: 45 Mins Total Questions : 30

1 )

Aquaregia used by alchemist to separate silver and gold is a mixture of

(a)
concentrated HNO₃ and concentrated H₂SO₄
(b)
concentrated HCL and concentrated H₂SO₄
(c)
concentrated HNO₃ and concentrated HCL
(d)
dilute HNO₃ and dilute HCL

2 )

Vinegar is used as a condiment and in the pickling vegetables and other food.
What is the constituent of vinegar?

(a)
Butanoic acid
(b)
Methanoic acid
(c)
Ethanoic acid
(d)
Hexanoic acid

3 )

Which one of the following compounds was responsible for the epidemic form of disease called ' Minamata disease'?

(a)
A lead compound
(b)
A mercury compound
(c)
A sulphur compound
(d)
A fluorine compound

4 )

Which one among the following is the chief compound used in pepper spray a riot control agent?

(a)
Capsaicin
(b)
Black pepper
(c)
Sulphur dioxide
(d)
Hydrogen sulphide

5 )

Carbonated beverages such as soft drinks and soda water contains mainly

(a)
carbon dioxide
(b)
calcium carbonate
(c)
calcium hydroxide
(d)
potassium carbonate

6 )

Consider the following statements
1. Rust is formed by the reaction of iron and oxygen in the presence of water or air moisture.
2. In salt water, iron tends to rust more quickly.
Which of the statement(s) given below is/are correct?

(a)
Only 1
(b)
Only 2
(c)
Both 1 and 2
(d)
Neither 1 nor 2

7 )

In modern days, which one of the following chemical compounds is used for the hair setting in beauty parlours/saloons?

(a)
A phosphate compound
(b)
A sulphur compound
(c)
A magnesium compound
(d)
A bicarbonate compound

8 )

Why can not hard water be used in boilers?

(a)
The boiling point of hard water is high.
(b)
The conductivity of hard water is less.
(c)
Hard water causes scales in boilers.
(d)
Hard water reacts with metals used in making boilers.

9 )

The gas which turns lime water milky is

(a)
carbon dioxide
(b)
carbon monoxide
(c)
ammonia
(d)
nitrogen dioxide

10 )

On the labels of the bottles, some soft drinks are claimed to be acidity regulators. They regulate acidity using

(a)
carbon dioxide
(b)
bicarbonate salts
(c)
Both (a) and (b)
(d)
carbon dioxide and lime

11 )

Match Column I with Column II and select the correct answer using the codes given below the columns.

Column I (Acid)	Column II (Source)
A. Lactic acid	1. Tamarind
B. Tartaric acid	2. Orange
C. Oxalic acid	3. Tomato
D. Citric acid	4. Sour curd

(a)

A B C D

2 4 3 1
(b)

A B C D

2 3 4 1
(c)

A B C D

4 3 1 2
(d)

A B C D

4 1 3 2

12 )

The hair dye available in the market contains two bottles, one containing dye and other containing hydrogen peroxide. The bottles are mixed before applying the dye. The function of hydrogen peroxide is

(a)
to dilute the dye
(b)
to oxidise the dye to give desired colour
(c)
to reduce the dye to give desired colour
(d)
to acidify the dye solution

13 )

Consider the following statements
1. Acid rain is caused by emission of carbon dioxide, sulphur dioxide and nitrogen oxides.
2. The most important gas which leads to acidification is sulphur dioxide.
Which of the statement(s) given below is/are correct?

(a)
Only 1
(b)
Only 2
(c)
Both 1 and 2
(d)
Neither 1 nor 2

14 )

Arsenic drugs are mainly used in the treatment of

(a)
Jaundice
(b)
Typhoid
(c)
Syphilis
(d)
Cholera

15 )

The rusting of iron nail

(a)
decreases its weight
(b)
increases its weight
(c)
does not affect weight but iron is oxidised
(d)
does not affect weight but iron is reduced

16 )

Graphite can be used as lubricant because it has

(a)
a rigid structure
(b)
low viscosity
(c)
layered structure
(d)
low melting point

17 )

Which one of the following types glass can cut off ultraviolet rays?

(a)
Soda glass
(b)
Pyrex glass
(c)
Jena glass
(d)
Crooked glass

18 )

Which one of the following does not contains silver?

(a)
Horn silver
(b)
German silver
(c)
Ruby silver
(d)
Lunar caustic

19 )

Match the Column I (Fuel Gases) with Column II (Major constituents) and select the correct answer using the codes given below the columns.

Column I	Column II
A. CNG	1.Carbon monoxide, Hydrogen
B. Coal gas	2. Butane, propane
C. LPG	3. Methane, ethane
D. Water gas	4. Hydrogen, methane, Carbon monoxide

(a)

A B C D

2 1 3 4
(b)

A B C D

3 4 2 1
(c)

A B C D

2 4 3 1
(d)

A B C D

3 1 2 4

20 )

Which one of the following is as philosopher's?

(a)
zinc bromide
(b)
Zinc nitrate
(c)
Zinc chloride
(d)
Zinc oxide

21 )

Consider the following statements
1. The chlorine gas is used for the manufacture of bleaching powder.
2. Bleaching powder is used for disinfecting.
3. Bleaching powder is used for bleaching cotton and linen in the textiles industry.
Which of the statement(s) given below is/are correct?

(a)
1 and 2
(b)
1 and 3
(c)
2 and 3
(d)
1, 2 and 3

22 )

In cold countries, ethylene glycol is added to the water in the radiators of the cars during winter to

(a)
lower the freezing point of the water
(b)
reducing the viscosity of water
(c)
reduce the specific heat of the water
(d)
increase the conductivity of the water

23 )

Which one of the following has the highest fuel value?

(a)
Hydrogen
(b)
Charcoal
(c)
Natural gas
(d)
Gasoline

24 )

Consider the following statements
1. Fuels with low octane numbers are ideal for diesel engines.
2. Use of gasoline with low octane numbers may lead to the problem of engine knocking.
Which of the statement(s) given above is/are correct?

(a)
Only 1
(b)
Only 2
(c)
Both 1 and 2
(d)
Neither 1 nor 2

25 )

Heavy water

(a)
contains more dissolved mair
(b)
contains more dissolved minerals
(c)
contains deuterium in place of hydrogen
(d)
contains organic impurities

26 )

Indane gas is a mixture of

(a)
butane and hydrigen
(b)
butane and oxygen
(c)
butane and propane
(d)
methane and oxygen

27 )

Regular intake of fresh fruits and vegetables is recommended in the diet since they are a good source of antioxidants. How do antioxidants help a person maintain health and promote longevity?

(a)
They activate the enzymes necessary for vitamin synthesis in the body and help prevent vitamin deficiency
(b)
They prevent excessive oxidation of carbohydrate, fats and proteins
(c)
They neutralize the free radicals produced in the body during metabolism
(d)
They activate certain genes in the cells of the body and help delay the metabolism

28 )

Aspartame is an artificial sweetener sold in the market. It consists of amino acids and provides calories like other amino acids. Yet, it is used as a low-calories sweetening agent in food items.What is the basis of this use?

(a)
Aspartame is as sweet as table sugar, but unlike table sugar, it is not readily oxidised in human body due to lack of requisite enzymes
(b)
When aspartame is used in food processing, the sweet taste remains but it becomes resistant to oxidation
(c)
Aspartame is as sweet as sugar but after ingestion into the body, it is converted into metabolites that yield no calories
(d)
Aspartame is several times sweeter than table sugar, hence food items made with small quantities of aspartame yield fewer calories on oxidation

29 )

In the context of global oil prices. "Brent crude oil" is frequently in the news. What does this term imply?
1. It is major classified of crude oil.
2. It is sourced from North Sea.
3. It does not contain sulphur.
Which of the statement(s) given above is/are correct?

(a)
Only 2
(b)
1 and 2 Only
(c)
1 and 3 Only
(d)
1, 2 and 3

30 )

Consider the following
1. Carbon dioxide
2. Oxides of nitrogen
3. Oxides of sulphur
Which of the above is/are emission/emissions from coal combustion at thermal power plants?