General Chemistry

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271 The Refrigerant ‘FREON' is :

A
Calcium Tetra Fluoride
B
Difluoro Dichloro Methane
C
Fluorspar and Felspar
D
Hydrofluosilicic Acid

272 Which of the following contains high content of lead?

A
Coal
B
Cooking gas
C
High octane fuel
D
Low octane fuel

273 The metals commonly used for electroplating are

A
Gold, Sodium and Chromium
B
Chromium, Copper and Nickel
C
Nickel, Lead and Chromium
D
Gold, Sodium and Potassium

274 Non-stick kitchenwares are coated with

A
PVC
B
Graphite
C
Teflon
D
Silicon

275 The fuel that is used in modern submarines is :

A
Nuclear fuel
B
Petrol
C
Coal
D
Diesel

276 Milk tastes sour when it is left in open for some time. This happens due to the formation of :

A
Lactic acid
B
Citric acid
C
Acetic acid
D
Carbonic acid

277 The fundamental particles present in the nucleus of an atom are

A
Electron, proton
B
Proton, neutron
C
Neutron, electron
D
Neutron, positron

278 Which is the purest form of iron ?

A
Steel
B
Cast iron
C
Pig iron
D
Wrought iron

279 The long range potential of nuclear energy in India depends on its reserves of :

A
thorium
B
uranium
C
plutonium
D
radium

280 Which of the following is used to remove rust stains on cloth?

A
Kerosene
B
Lime
C
Oxalic acid solution
D
Petrol

281 In which of the following substances all carbon atoms are quaternary in nature ?

A
Graphite
B
Diamond
C
Teflon
D
Napthalene

282 The substance most commonly used as a food preservative is :

A
sodium carbonate
B
tartaric acid
C
acetic acid
D
sodium salt of benzoic acid

283 Diamond is harder than graphite because of :

A
difference in layers of atoms
B
tetrahedral structure of diamond
C
difference of crystalline structures
D
None of these

284 Which of the following compounds is commonly used as an antiseptic in mouthwashes and toothpastes ?

A
Borax
B
Saltpetre
C
Hydrogen peroxide
D
Sodium chloride

285 Which of the following type of coal has the lowest proportion of volatile matter ?

A
Lignite
B
Peat
C
Bituminous
D
Anthracite