Description : Sulphur dioxide bleaches colouring matter by – (1) Reduction (2) Dehydration (3) Decomposition (4) Oxidation
Last Answer : (1) Reduction Explanation: Sulphur dioxide gas exhibits bleaching properties in presence of moisture. It dissolves in water liberating nascent hydrogen. Nascent hydrogen removes oxygen atoms from the colouring matter (reduces colouring matter) and it loses its colour.
Description : Sulphur dioxide bleaches colouring matter by?
Last Answer : Reduction.
Description : Two gases X and Y bring about bleaching of flowers. X bleaches due to oxidation of dye while Y bleaches by reducing the colouring matter. X and Y are
Last Answer : Two gases X and Y bring about bleaching of flowers. X bleaches due to oxidation of dye while Y bleaches by ... C. `SO_2, O_2` D. (4) None of these
Description : Activated Charcoal is used to remove colouring matter from pure substances by – (1) Bleaching (2) Oxidation (3) Adsorption (4) Reduction
Last Answer : (3) Adsorption Explanation: Heating wood to a very high temperature in the absence of air makes charcoal. When it is heated to an even higher temperature, about 930°C, impurities are driven from its ... . It does so by the process of adsorption, or by attracting these molecules to the surface.
Description : Activated Charcoal is used to remove colouring matter from pure substances by (1) Bleaching (2) Oxidation (3) Adsorption (4) Reduction
Last Answer : Adsorption
Description : One gas bleaches the colour of flowers by reduction and other by oxidation. These gases are
Last Answer : One gas bleaches the colour of flowers by reduction and other by oxidation. These gases are A. (A) `SO_2,CI_2` ... ) `H_2S, Br_2 ` D. (D) `NH_3, SO_3`
Last Answer : One gas bleaches the colour of flowers by reduction and other by oxidation. These gases are A. CO and `CO_(2)` B. ... Cl_(2)` D. `NH_(3)` and `SO_(3)`
Description : Setting of plaster of paris involves – (1) dehydration process (2) hydration to form other hydrates (3) oxidation process (4) reduction process
Last Answer : (2) hydration to form other hydrates Explanation: The setting of plaster of Paris takes place by hydration due to the formation of a solid crystalline hydrate and hardening of Plaster of Paris is ... . A slight expansion takes place in the process and heat is evolved. This process is exothermic.
Description : The action of concentrated sulfuric acid on sugar best described as: w) catalysis x) oxidation y) reduction z) dehydration
Last Answer : ANSWER: Z -- DEHYDRATION
Description : Setting of plaster of paris involves (1) dehydration process (2) hydration to form other hydrates (3) oxidation process (4) reduction process
Last Answer : hydration to form other hydrates
Description : The working of a dry cell is based on - (1) Decomposition reaction (2) Spontaneous oxidation-reduction reaction (3) Combination reaction. (4) Electrolysis
Last Answer : (4) Electrolysis Explanation: A dry cell is a type of battery that uses a paste electrolyte, with only enough moisture to allow current to flow. It works in accordance with Faraday's law of ... of the cell (the positive electrode), and the space between them is filled with an electrolyte paste.
Description : Bleaching action of chlorine is by - (1) Decomposition (2) hydrolysis (3) reduction (4) oxidation
Last Answer : (4) oxidation Explanation: Chlorine bleaches by the process of oxidation. It needs moisture for its bleaching action. Chlorine reacts with water to form hydrochloric and hypochlorous acids.
Description : CuO + H2 = Cu + H2O. This equation is an example of - (1) Oxidation (2) Decomposition (3) Reduction (4) Redox
Last Answer : (4) Redox
Description : Bleaching action of chlorine is by - (1) decomposition (2) hydrolysis (3) reduction (4) oxidation
Description : Which of the following is a physical change? (1) oxidation (2) reduction (3) sublimation (4) decomposition
Last Answer : (3) sublimation Explanation: Sublimation is a type of phase transition, or a change in a state of matter, just like melting, freezing, and evaporation.
Description : Which of the following reactions involve NEITHER oxidation nor reduction? w) burning antimony in chlorine x) decomposition of potassium chlorate y) reaction of sodium with water z) reaction of potassium hydroxide with nitric acid
Last Answer : ANSWER: Z -- REACTION OF POTASSIUM HYDROXIDE WITH NITRIC ACID
Description : The working of a dry cell is based on (1) Decomposition reaction (2) Spontaneous oxidation-reduction reaction (3) Combination reaction (4) Electrolysis
Last Answer : Electrolysis
Description : The gas produced in marshy places due to decomposition of vegetation is – (1) Carbon monoxide (2) Carbon dioxide (3) Sulphur dioxide (4) Methane
Last Answer : (4) Methane Explanation: Methane gas is a hydrocarbon gas largely composed of methane formed when organic material or vegetation decays in the absence of air. Naturally occurring methane is mainly produced by the process of methanogenesis. It is also known as Swamp Gas.
Description : The gas produced in marshy places due to decomposition of vegetation is (1) Carbon monoxide (2) Carbon dioxide (3) Sulphur dioxide (4) Methane
Last Answer : Methane
Description : The process of elimination of water from any system is called (a) Oxidation (b) Reduction (c) Dehydration (d) Evaporation
Last Answer : Ans:(c)
Description : Which of the following processes is involved in the biochemical treatment of sewage effluents? (A) Oxidation (B) Reduction (C) Dehydration (D) Fermentation
Last Answer : (A) Oxidation
Description : The biochemical treatment applied to sewage effluents is a process of (A) Dehydration (B) Reduction (C) Oxidation (D) Polymerisation
Last Answer : (C) Oxidation
Description : A gas which bleaches substances by reduction process is
Last Answer : A gas which bleaches substances by reduction process is A. `CaOCl_(2(aq))` B. `H_(2)O_(2(aq))` C. `O_(3)` D. `SO_(2(aq))`
Last Answer : A gas which bleaches substances by reduction process is A. Moist `Cl_(2)` B. `SO_(2)` C. `O_(3)` D. Dry `Cl_(2)`
Description : Decomposition of the acetyl salicylic acid at room temperature most likely would occur by (a) Oxidation of the ester (b) Reduction of the carboxylic acid (c) Hydrolysis of the ester
Last Answer : Ans: C
Description : Rusting is the process of – (1) Oxidation (2) Reduction (3) Decomposition (4) Displacement
Last Answer : (1) Oxidation Explanation: Rust is the process of iron (molecules) oxidizing into iron oxide, or rust. General formula of rust is Fe2O3.nH2O
Description : Bleaching action of chlorine is by----? A. Oxidation (Answer) B. Reduction C. Decomposition D. Hydrolysis
Last Answer : A. Oxidation (Answer)
Description : Rusting of Iron involves--------? A. Reduction B. Oxidation (Answer) C. Decomposition D. Displacement
Last Answer : B. Oxidation (Answer)
Description : During decomposition, energy is absorbed in the form of heat, light or electricity for breaking down the reactants which is known as: (a) exothermic reaction (b) endothermic reaction (c) reduction reaction (d) oxidation
Last Answer : (b) endothermic reaction
Description : Which two distinct microbial processes are responsible for the release of fixed nitrogen as dinitrogen gas (N2) to the atmosphere? (a) Aerobic nitrate oxidation and nitrite reduction (b) ... fixation by Rhizobium in root nodules of legumes (d) Anaerobic ammonium oxidation and denitrification
Last Answer : (d) Anaerobic ammonium oxidation and denitrification
Description : Cement setting under water employs a/an __________ process. (A) Hydration (B) Decomposition (C) Oxidation (D) Reduction
Last Answer : (A) Hydration
Description : Pick out the wrong statement. (A) Catalytic converter is fitted in automobiles to reduce carbon monoxide concentration in exhaust emissions (B) Inhalation of pollutant carbon monoxide results ... D) Decomposition of plants containing chlorophyll is a natural source of carbon monoxide in atmosphere
Last Answer : (C) Sulphur dioxide is the main pollutant emitted from the exhaust of petrol driven automobiles
Description : All decomposition reaction are endothermic but decomposition of vegetable matter into compost is exothermic because (a) It is an oxidation reaction (b) decomposition done by microbes (c) releases heat energy (d) all the above
Last Answer : (d) all the above
Description : Many microbes can effect the chemical process of (a) Dehydration (b) Decomposition (c) Fermentation (d) Polymerisation
Description : In what type of chemical reaction are the products of water removed during the formation of covalent bonds? a. Hydrolysis b. Ionization c. Dehydration synthesis d. Decomposition
Last Answer : c. Dehydration synthesis
Description : Activated charcoal is employed to remove colouring matter from pure substance, it work? -Do You Know?
Last Answer : answer:
Description : Haemoglobin is 1. The colouring matter of leaves of plants 2. The colouring matter of blood 3. A compound that is highly coloured 4. A compound that contains iron The correct answers are: (a) 1, 2 and 4 (b) 2, 3 and 4 (c) 1, 2, 3 and 4 (d) 1, 2 and 3
Last Answer : Ans:(b)
Description : Activated charcoal is employed to remove colouring matter from pure substance, it work?
Description : The catalyst used in the production of elemental sulphur from H2S (by oxidation-reduction) is (A) Alumina (B) Silica gel (C) Platinum (D) Nickel
Last Answer : (A) Alumina
Description : Sulphur dioxide present in the industrial chimney exhaust gases causes (A) Respiratory & lung disease (B) Reduction in plant's productivity owing to acid rain (C) Corrosion of building materials (D) All (A), (B) and (C)
Last Answer : (D) All (A), (B) and (C)
Description : Dearomatization of kerosene (by liquid sulphur dioxide extraction) is done to (A) Increase its smoke point (B) Improve its oxidation stability (C) Decrease the breathing loss (D) None of these
Last Answer : (B) Improve its oxidation stability
Description : An example of autothermal reactor operation is (A) Sulphur dioxide oxidation (B) Ethylene oxidation (C) Benzene oxidation (D) Ammonia synthesis
Last Answer : (B) Ethylene oxidation
Description : With increase in temperature, the equilibrium constant at constant pressure (Kp) for oxidation of sulphur dioxide (A) Increases (B) Increases linearly (C) Decreases (D) Decreases linearly
Last Answer : (C) Decreases
Description : The reduction of the PH value, by the action of atmospheric carbon dioxide with the alkali of the cement paste is called [ A ] atmospheric corrosion [ B ] chloride corrosion [ C ] oxidation [ D ] carbonation
Last Answer : [ D ] carbonation
Description : A scrubber in the exhaust of a chemical industrial plant removes (a) gases like sulphur dioxide (b) particulate matter of the size 5 micrometer or above (c) gases like ozone and methane (d) particulate matter of the size 2.5 micrometer or less.
Last Answer : a) gases like sulphur dioxide
Description : The thermal decomposition of alkanes in the absence of air is called : (a) Combustion (b) Oxidation (c) Cracking (d) Hydrogenation
Last Answer : Cracking
Description : (4) Decomposition of manganese dioxide Explanation: One of the two chemical methods starts from natural manganese dioxide and converts it using dinitrogen tetroxide and water to manganese nitrate ... 400°C, the salt decomposes, releasing N2O4 and leaving a residue of purified manganese dioxide.
Last Answer : The mass number of a nucleus is - (1) always less than its atomic number (2) the sum of the number of protons and neutrons present in the nucleus (3) always more than the atomic weight (4) a fraction
Description : Which of the following is not a method of preparing oxygen? (1) Electrolysis of water (2) Fractional distillation of liquid air (3) Decomposition of potassium permanganate (4) Decomposition of manganese dioxide
Last Answer : Decomposition of manganese dioxide
Description : Atmospheric corrosion of metals result from their (A) Slow oxidation (B) Fast oxidation (C) Fast hydration (D) Slow dehydration
Last Answer : (A) Slow oxidation