A quick 25 questions article on Chemistry – General Knowledge – MCQs (Part III) like on galvanisation, cocoa and caffine, washing soda, gobar gas, phosgene, calorific value etc.
Other similar articles: Test – 1 | Test – 2 | Test – 3 | Test – 4 | Test – 5 | Test – 6 | Test – 7 | Test – 8 | 75 One Liners.
Que (1): Galvanised iron sheets have a coating of which metal?
Explanation: Galvanization is the process of applying a protective zinc coating to steel or iron, to prevent rusting – very common industrial practice.
Que (2): wsda contain significant quantities of which thing?
A. Carbon dioxide
B. Artificial colors
D. none of these
Que (3): For which thing is Washing soda the common name?
A. Calcium carbonate
B. Magnesium carbonate
C. Sodium carbonate
D. none of these
Answer: Sodium carbonate
Explanation: Sodium carbonate (also known as washing soda or soda ash) with formula Na2CO3 is a sodium salt of carbonic acid and is an inorganic compound.
Que (4): Which hydrocarbon is mainly present in gobar gas?
Explanation: The chief constituent of gobar gas is methane. The gobar gas is also called biogas.
Que (5): The cause of fractional atomic weights of elements?
A. Excess of electrons
B. Excess of protons
C. Presence of isotopes
D. Atomic structure of the element
Answer: The presence of Isotopes
Explanation: The atomic masses of most elements are fractional because they exist as a mixture of isotopes of different masses. Most elements occur as a mixture of isotopes of different masses.
Que (6): Which gas has maximum calorific value?
D. Natural gas
Answer: Natural gas
Explanation: Natural gas has more calorific value when compared to diesel, petrol, and kerosene.
Que (7): Phosgene is obtained by the reaction of carbon monoxide and which gas?
Explanation: Phosgene is a toxic gas prepared by the reaction of carbon monoxide with chlorine. CO(g) + Cl2(g) → COCl2(g) The following data were obtained in a kinetics study of its formation at 150 °C. Also, if you just know the chemical formula of it from that also you can just derive or get to know which compounds or elemebts combined to make up phosgene.
Que (8): Which petroleum refinery product has the lowest boiling point?
Explanation: It has an initial boiling point at atmospheric pressure of about 35 °C (95 °F) and a final boiling point of about 200 °C (395 °F).
Que (9): Which sets indicated the Aeolian process?
D. All the three
Answer: Corrosion, attrition, deflation
Que (10): Which compound does not contains an OH group?
D. None of these
Explanation: An aldehyde is a compound containing a functional group with the structure −CHO, consisting of a carbonyl center (a carbon double-bonded to oxygen) with the carbon atom also bonded to hydrogen and to an R group
Que (11): Maximum hydrogen bonding would be observed in which compound?
Explanation: Maximum hydrogen bonding is observed in 1∘ alcohol which is methanol.
Que (12): Which minerals occurs abundantly in the Earth’s crust?
Explanation: The crust of the earth is made up of more than 2000 minerals, but out of these, only six are the most abundant and contribute the maximum. These six most abundant minerals are feldspar, quartz, Silica, amphiboles, mica and olivine.
Que (13): What are the metallic constituents of hard water?
D. All of these
Answer: All of these
Que (14): According to Dalton’s atomic theory, which is the smallest particle which can exist independently?
A. An atom
B. A particle
C. An electron
Answer: An atom
Explanation: Atoms are the basic building blocks of ordinary matter. Atoms can join together to form molecules, which in turn form most of the objects around you. Atoms are composed of particles called protons, electrons and neutrons.
Que (15): What is the maximum number of hydrogen bonds in a H2O molecule?
Explanation: A single water molecule can participate in a maximum of four hydrogen bonds because it can accept two bonds using the lone pairs on oxygen and donate two hydrogen atoms.
Que (16): Which chemical is most suitable to control storage insects on a small scale?
Que (17): The nitrogen percentage is the highest in which fertilizer?
A. Livestock manure
B. Agricultural waste
Explanation: The nitrogen fertilizer with the highest percentage of nitrogen is urea.
Que (18): Activated charcoal is employed to remove colouring matter from pure substance, it works by which method?
Explanation: Activated charcoal is used to remove colouring matter from pure substances. It works by adsorption. Colour impurities are adsorbed on the surface of activated charcoal.
Que (19): Which compound gives both ninhydrin test and Molisch’s test?
A. A calcium
D. none of these
Answer: A protein
Explanation: Molisch’s test is a sensitive chemical test, named after Austrian botanist Hans Molisch, for the presence of carbohydrates, based on the dehydration of the carbohydrate by sulfuric acid or hydrochloric acid to produce an aldehyde
Que (20): Which are the high-temperature superconductors?
D. Ceramic oxides
Answer: Ceramic oxides
Que (21): What makes a lemon sour?
A. Chloric acid
C. Hydrobromic acid
D. Citric Acid
Answer: Citric acid
Explanation: The pulp and rind are also used in cooking and baking. The juice of the lemon is about 5% to 6% citric acid, with a pH of around 2.2, giving it a sour taste.
Que (22): In which type of coal percentage of carbon is the highest?
Explanation: It has the highest carbon content, the fewest impurities, and the highest energy density of all types of coal and is the highest ranking of coals. Anthracite is the most metamorphosed type of coal
Que (23): What is the mixture of carbon monoxide and nitrogen called?
D. Producing gas
Answer: Producer gas
Explanation: A combustible mixture of nitrogen, carbon monoxide, and hydrogen, generated by passing air with steam over burning coke or coal in a furnace and used as fuel. Also called air gas
Que (24): When chlorophyll absorbs light, what does it gets excited and emits?
Explanation: When chlorophyll absorbs light, it gets excited and emits electrons. These chlorophylls are found in photosynthetic units called Photosystem I and Photosystem II.
Que (25): What is formed when white phosphorus is heated at 540 K in the absence of air?
A. Red phosphorous
B. White phosphorous
C. Non-toxic phosphorous
Answer: Red phosphorus
Explanation: Red phosphorus is one of the most common allotropes of phosphorus and is considered to be a derivative of the P4 molecule
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