Chemistry One-Liners for various competitive examinations-June 17

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1- The reaction in which two compounds exchange their ions to form two new compounds is called

(a) redox reaction

(b) double displacement reaction

(c) combination reaction.

(d) displacement reaction.

2- Due to this process Fatty foods become rancid

(a) reduction.

(b) hydrogenation

(c) oxidation.

(d) corrosion.

3- The ash formed after a magnesium ribbon is burnt in the air is

(a) pink

(b) yellow.

(c) white.

(d) black.

4- The electrolytic decomposition of water gives H2 and O2 in the ratio of

(a) 1 : 2 by volume.

(b) 1 : 2 by mass

(c) 2 : 1 by volume.

(d) 8: 1 by mass.

5- When carbon dioxide is passed through lime water, these changes take place-

(a) colour of lime water disappears.

(b) lime water turns milky.

(c) white precipitate of CaO is formed.

(d) calcium hydroxide is formed.

6- By which method, Rancidity can be prevented

(a) keeping food in the refrigerator.

(b) storing food away from light.

(c) adding antioxidants.

(d) all of these.

7- Generally people store silver chloride in a dark coloured bottle because it is-

(a) undergoes redox reaction.

(b) to avoid action by sunlight.

(c) a white solid.

(d) none of the above

8- Heat energy will be evolved in which of the following?

(a) Dissolution of NH4Cl in water.

(b) Electrolysis of water.

(c) Decomposition of AgBr in the presence of sunlight.

(d) Burning of L.P.G.

9- What you will observe after immersing an iron nail in CuSO4 solution for a few minutes-

(a) the surface of iron nails acquires a black coating.

(b) the colour of solution changes to green

(c) no reaction takes place.

(d) the colour of the solution fades away.

10- CO2 and H2 gases exhibit this feature-

(a) colourless.

(b) heavier than air.

(c) soluble in water

(d) acidic in nature.

11- The chemical formula of lead sulphate is

(a) PbSO4.

(b) Pb2(SO4)3

(c) Pb2SO4.

(d) Pb(SO4)2.

12- The reaction of H2 gas with oxygen gas to form water is an example of

(a) exothermic reaction.

(b) combination reaction

(c) redox reaction.

(d) all of these reactions

13- Rust is chemically a

(a) hydrated ferric oxide.

(b) only ferric oxide.

(c) hydrated ferrous oxide.

(d) hydrated iron-oxide.

14- Due to the formation of what Silver article turns black when kept in the open for a few days-

(a) AgSO4.

(b) Ag2S

(c) H2S.

(d) AgS.

15- In which among the following, Rusting of iron takes place?

(a) both ordinary and distilled water

(b) ordinary water

(c) distilled water

(d) none of the above

ANSWERS-

1- Double displacement reaction.

2- oxidation.

3- white.

4- 2 : 1 by volume.

5-lime water turns milky.

6- all of these.

7- to avoid action by sunlight.

8- Burning of L.P.G.

9- the colour of solution changes to green

10- colourless.

11- PbSO4.

12-combination reaction

13-hydrated ferric oxide.

14- Ag2S

15- both ordinary and distilled water

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Chemistry One-Liners for various competitive examinations- May 14

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1- By whom Neutron was discovered?

(A) J. J. Thomson
(B) J. Chadwick
(C) Neil Bohr
(D)Rutherford

2- Chemically Aspirin is called as

(A) Acetylsalicylic acid
(B) Ethyl salicylate
(C) Sodium salicylate
(D) Methyl salicylate

3- With what Dry ice is made up of

(A ) Carbon dioxide
(B) Hydrocarbon
(C) Chlorine
(D) Water.

4- Name the most malleable metal among the following

(A) Gold
(B) Iron
(C) Silver
(D) Platinum

5- The process of Galvanization is deposition of

(A) copper on iron
(B) tin on iron
(C) aluminum on iron
(D) zinc on iron

6- The chemical formula of white vitriol is

(A) FeSO4, 7H2O
(B) ZnSO4, 7H2O
(C) MgSO4, 7H2O

(D) CuSO4, 5H2O

7- Phenyl used for the household purpose is a derivative of

(A) Anthracene
(B) Benzene
(C) Tartaric acid
(D) Methyl alcohol

8- Ozone depletion in the stratosphere is mainly due to

(A) Sulphur-di-Oxide
(B) Carbon dioxide
(C) Chlorofluorocarbon
(D) Nitric Oxide

9- Vulcanization is the process of heating rubber with 3-5 % of

(A) Sulfur
(B) Lime
(C) Potassium permanganate
(D) Naphthalene

10- Name the pollutant of the atmosphere that inhibits the Hill reaction of photosynthesis.

(A) Hydro Carbon
(B) Peroxyacetyl nitrate
(C) Ultraviolet rays
(D) Nitrogen monoxide

11- Name the substance that can act as an only reducing agent.

(A) H2S
(B) K2Cr2O7
(C) MnO2

(D) H2O2

12- In underground Railways, with what the air is purified?

(A) Ozone
(B) Hydrogen peroxide
(C) Oxygen
(D) None of the above

13- Blood hemoglobin contains this metal

(A) Iron
(B) Copper
(C) Magnesium
(D) Aluminum

14- Fullerene is

(A) A compound of carbon
(B) A synonym for carborundum
(C) An allotrope of carbon
(D) Artificial emery

15- The heat of this radiations is trapped by the Greenhouse effect gases

(A) Ultraviolet
(B) Infrared
(C) Both (A) and (D)
(D) Solar

ANSWERS- 

1- J. Chadwick.

2- Acetylsalicylic acid.

3-Carbon dioxide.

4- Gold.

5- zinc on iron.

6- ZnSO4. 7H2O

7- Benzene.

8- Chlorofluorocarbon.

9- Sulphur.

10- Peroxyacyl nitrate.

11- H2S.

12- Hydrogen peroxide.

13- Iron.

14-An allotrope of carbon.

15-Infrared.

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Chemistry One-Liners for various competitive examinations- January 27th

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 Here are some important Chemistry one-liners for students competing for various exams

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1- The mass number of a nucleus is-

1- Always more than the atomic weight.

2- Always less than its atomic number.

3- The sum of the number of neutrons and protons.

4- None of these.

2- From which among the following, Phosphorus is mainly extracted?

1- Fertiliser.

2- Bone Ash.

3- Sand.

4- Ash.

3- The main ingredient of cement among the following is?

1- Gypsum

2- Limestone.

3- Silica Clay

4- Ash.

4- This material among the following can be deformed permanently by heat and pressure-

1- Polymer.

2- Thermoplastic.

3- Chemical Compound.

4- Thermoset.

5-Nylon is prepared from which among the following?

1- Ethylene glycol and adipic acid phthalic acid.

2-Ethylene glycol and nitric acid diamine.

3- Hexamethylene diamine and phthalic acid.

4-Adipic acid and hexamethylene diamine.

6-Ascorbic acid is another name for this vitamin.

1- B

2- C.

3- A.

4- D

7- Ordinary Microscope can measure up to which among the following?

1- 500nm

2- 400nm.

3- 700nm

4- 200nm.

8- This is another name for electron pool theory-

1- Liquid theory.

2- Electron gas theory.

3- Pool theory

4- Solid theory.

9- In which Metallic theory was proposed?

1- 1987

2- 1978.

3- 1923.

4- 1900.

10- In 1748, the first-time word used in connection with electricity was-

1- Charge.

2- Battery.

3- Electrode.

4- All of them.

11- What happens when TEL (Tera Ethyl Lead) is added to petrol?

1- Decrease the anti-knocking rating.

2- Increase the anti-knocking rating.

3- Decrease the B.P of petrol.

4- It will increase the B.P of petrol.

12- Chlorine’s (Cl) relative atomic mass is 35.5. This half number is due to-

1- Half proton.

2- Isotopes.

3- Half Electron.

4- Half Neutron.

13- For deep sea diving oxygen is usually mixed with which among the following?

1- Nitrogen Gas.

2- Hydrogen.

3- Helium.

4- Argon Gas.

14- Dalton’s law of partial pressure has applications in-

1- Respiration.

2- Metabolism.

3- Circulation.

4- Excretion.

15- The hypothesis that equal volume of all gases possess the same number of molecules is called as-

1- Avogadro hypothesis.

2-Avogadro constant.

3- Alvarado’s theory

4- Avagadro’s equilibria.

ANSWERS-

1- The sum of the number of neutrons and protons.

2-Bone Ash.

3-Gypsum.

4-Thermoset

5-Adipic acid and hexamethylene diamine.

6- C

7- 500nm

8-Electron gas theory.

9-1923.

10-Battery.

11-Increase the anti-knocking rating.

12-Isotopes.

13-Helium.

14-Respiration.

15-Avogadro hypothesis.

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Chemistry One-Liners for various competitive examinations

Thank You for landing the Chemistry section page.

 Here are some important Chemistry one-liners for students competing for various exams

 Watch some of the important Chemistry Bits below.

1-Carbonated beverages such as soft drinks and soda water contain mainly what?

2-Which gas is used to artificially ripen the fruits?

3-The light emitted by Firefly is due to-

4-Which substance/chemical is used in the preparation of the antiseptic solution?

5-Which agent is added to domestic LPG cylinder to help in the detection of gas leakage?

6-Diamond is an allotropic form of –

7-The most abundant metal in the earth’s crust is-

8-The pungent smell of garlic is due to-

9-Which gas was leaked in Bhopal Gas Tragedy?-

10-Who is regarded as father of modern chemistry?

11-The green color seen in fireworks display is due to the chloride salt of-

12-The element common to all acid is-

13-An alloy used in making heating elements for electric heating devices is-

14-Gobar gas contains mainly-

15-Which compound was responsible for the epidemic form of disease called Minamata Disease?

16-The most important ore of aluminium is-

17-Which gas is filled in Air conditioners?

18-Which acid is present in lemon?

19-The term PVC used in the plastic industry stands for-

20-Oil of vitriol is

21-Bleaching action of chlorine is by

22-A mixture of potassium nitrate powdered charcoal and sulphur is called

Ans-

1-Carbon Dioxide

2-Ethylene

3-Burning of phosphorus

4-Iodine

5-Thioethanol

6-Carbon

7-Aluminium

8- Sulphur Compound

9- Methyl Isocyanate

10- Lavoisier

11- Barium

12- Hydrogen

13- Nichrome

14- Methane

15-A mercury compound

16- Bauxite

17- Freon

18-Citric acid

19-Polyvinyl chloride

20-Sulphuric acid

21-Decomposition

22-Gun Powder

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Chemistry One-Liners for various competitive examinations

Thank You for landing the Chemistry section page.

 Here are some important Chemistry one-liners for students competing for various exams

 Watch some of the important Chemistry Bits below.

1- When TEL (Tera Ethyl Lead) is added to petrol-

A-It increases the B.P of petrol

B. Increases the anti-knocking rating

C. Decreases the B.P of petrol

D. Decreased the anti-knocking rating

2-Heavy metal pollution of water is caused by-

A. Paints

B. Acid Plants

C. Wood Burning

D. Domestic Sewage

3-Due to rusting the weight of iron

A. uncertain

B- decreases

C- increases

D- remains the same

4-The oil used in the froth flotation process is

A. Pine Oil

B. Olive oil

C. Kerosene

D. Coconut oil

5-Which of the following is the main ingredient of cement?

A. Limestone

B. Gypsum

C. Silica Clay

D. Ash

6-Mass number of a nucleus is

A. always more than the atomic weight

B. the sum of the number of neutrons and protons

C. always less than its atomic number

D. None of these

7- When water is added to anhydrous white copper sulfate, the color will change to

A. Yello

B. Blue

C. Green

D. Red

8-The macro-nutrient provided by inorganic fertilization is

A. N, P, K

B. C, N, P

C. C, Fe, B

D. Mg, Zn, Fe

9-Which of the following gases is present under the pressure in soft drinks?

(a) Carbon dioxide

(b) Nitrogen

(c) Oxygen

(d) Nitrous oxide

10-Cement is made hard with

(a) hydration and dissociation of water

(b) dehydration

(c) Dissociation of water

(d) Polymerisation

11-Which one of the following metals pollutes the air of a city having a large number of automobiles?

(a) Lead

(b) Chromium

(c)Cadmium

(d) Copper

12-Beryllium Sulphate is less soluble in water due to?

(a)ionic band

(b) Low Energy of dissociation

(c) Low inflammable energy

(d) High inflammable energy

13-The element which is commonly used in nuclear for producing electricity by nuclear fission is-

(a) Uranium

(b) Plutonium

(c) Radium

(d) Deuterium

14-Which of the following is used as a lubricant in heavy machines?

(a) Bauxite

(b) Sulphur

(c) Graphite

(d) Phosphorus

15-Milk is a colloidal system in which:

(a) Water is dispersed in fat

(b) Fat is dissolved

(c) Fat and water are dispersed in each other

(d) Fat is dispersed in water

16-Who developed atom bomb?

(a) J. Robert Open Heimer

(b) Warner Wan Brown

(c) Edward Taylor

(d) Samuel Koehen

17-The enzyme that converts glucose to ethyl alcohol is-

(a) Invertase

(b) Zymase

(c) Maltase

(d) Diastase

18-The major harmful gas emitted by automobile vehicle which causes air pollution is

(a) Carbon dioxide

(b) Methane

(c) Carbon Monoxide

(d) Ozone gas

Ans-

1- b; 2- a; 3- c; 4- a; 5- b; 6- b; 7- b; 8- a; 9- a; 10- a; 11- a; 12- d; 13- a; 14- c; 15- d; 16- a; 17- b; 18- a

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