Description : What happens when a substance loses oxygen during reaction? It is said to be (a) Oxidised (b) Reduced (c) Both (d) None of the above
Last Answer : (b) Reduced
Description : (i) Substances oxidised is Na as it gains oxygen and oxygen is reduced. (ii) Substances reduced is Cu as hydrogen is oxidised as it gains oxygen. -Chemistry-10
Last Answer : During this reaction, the sodium is gaining oxygen and is being oxidized. Oxygen is getting reduced. During this reaction, copper oxide is losing oxygen and is being reduced. The hydrogen is gaining oxygen and is being oxidized.
Description : Assertion :- `H_(2)S+Cl_(2)rarr2HCl+S` In the above reaction, Cl has been oxidised to `Cl^(-)` while `S^(-2)` has been reduced to S Reason :- In a rea
Last Answer : Assertion :- `H_(2)S+Cl_(2)rarr2HCl+S` In the above reaction, Cl has been oxidised to `Cl^(-)` ... is False. D. If both Assertion & Reason are False.
Description : Which of the following statements about the reaction given below are correct? MnO2 + 4HCI → MnCl2 +2H20 + Cl2 (i) HCl is oxidized to Cl2 (ii) MnO2 is reduced to MnCl2 (iii) MnCl2 acts as an oxidizing agent (iv) HCl acts ... b) (i), (ii) and (iii) (c) (i) and (ii) only (d) (iii) and (iv) only
Last Answer : Answer: . (c)
Description : Which of the following statements about the given reaction are correct? 3Fe(s) + 4H2O(g) → Fe3O4 (s) + 4H2 (g) (a) Iron metal is getting oxidized. (b) Water is getting reduced. (c) Water is acting as reducing agent. (d)Water is acting as ... (B) & (C) B) (C) & (D) C) (A), (B) & (D) D) (B) & (D)
Last Answer : C) (A), (B) & (D)
Description : A green coloured solid compound ̳X , gets oxidized to reddish brown solid in presence of air. ̳X on heating gives brown coloured solid ̳Y and two pungent smelling gases ̳A and ̳B . ̳A turns acidified potassium ... , SO 3 , decomposition (d) FeSO 4 , Fe 2 O 3 , SO 3 , SO 2 , decomposition
Last Answer : (c) FeSO 4 , Fe 2 O 3, SO 2 , SO 3 , decomposition
Description : Silver halides are used in photographic plates because they are (a) Oxidised in air (b) Colourless (c) Easily soluble in a hypo solution (d) Readily reduced by light
Last Answer : Ans:(d)
Description : Identify the substances that are oxidised and the substances which are reduced in the following reactions. (i) 4Na(s) + O2(g) → 2Na2O(s) (ii) CuO (s) + H2(g) → Cu (s) + H2O(l) -Chemistry-10
Last Answer : (i) Substances oxidised is Na as it gains oxygen and oxygen is reduced. (ii) Substances reduced is Cu as hydrogen is oxidised as it gains oxygen.
Description : Silver halides are used in photographic plates because they are - (1) oxidised in air (2) soluble in hyposolution (3) reduced by light (4) totally colourless
Last Answer : (3) reduced by light Explanation: The light-sensitive chemicals used in photographic film and paper are silver halides. Silver halides are used in photographic film and photographic paper, including ... - meaning that it can undergo development which turns the entire crystal into metallic silver.
Description : When iron is rusted, it is (A) Converted to a fine powder (B) Reduced (C) Oxidised (D) None of these
Last Answer : (C) Oxidised
Description : Silver halides are used in photographic plates because they are (1) oxidised in air (2) soluble in hyposolution (3) reduced by light (4) totally colourless
Last Answer : reduced by light
Description : `P_(4)(s) + 3OH^(-) (aq) + 3H_(2)O (I) rarr PH_(3) (g) + 3H_(2)PO_(2)^(-) (aq)` In the above equation, the species getting oxidized and reduced respec
Last Answer : `P_(4)(s) + 3OH^(-) (aq) + 3H_(2)O (I) rarr PH_(3) (g) + 3H_(2)PO_(2)^(-) (aq)` In the above equation ... ` C. `P_(4) and H_(2)O` D. `P_(4) and P_(4)`
Description : A chiral `C_(5)H_(10)O` alcohol is reduced by catalytic hydrogenation to an achiral `C_(5)H_(12)O` alcohol. The original alcohol is oxidized by activa
Last Answer : A chiral `C_(5)H_(10)O` alcohol is reduced by catalytic hydrogenation to an achiral `C_(5)H_(12)O` alcohol ... -2-buten-1-ol D. 2-methyl-2-buten-1-ol
Description : Which of the following is an electrolytic cell A. lron * (ll) * (Fe) oxidized, aluminum (Al) reduced O B. Silver (Ag) oxidized, gold (Au) reduced C. Aluminum () oxidized (Zn) reduced LithiumD. (Li) oxidized, (Zn) reduced?
Last Answer : The answer is not c.
Description : Which of the following statements is False/Incorrect about nitrobenzene? (a) is formed by nitration of benzene at temperatures below 60°C. (b) can be further nitrated to give m-dinitrobenzene. (c) can be oxidized with KMnO4 to give benzoic acid. (d) can be reduced with Sn/HCl to give aniline.
Last Answer : can be oxidized with KMnO4 to give benzoic acid
Description : In the conversion of wine to vinegar (a) Ethanol is oxidized to acetic acid (b) Ethanol is reduced to acetic acid (c) Methanol is oxidized to acetic acid (d) Methanol is reduced to acetic acid
Last Answer : Ethanol is oxidized to acetic acid
Description : When ethanol is treated with sodium metal : (a) Sodium ethoxide is formed (b) The sodium is oxidized (c) The acidic hydrogen in reduced (d) All these occu
Last Answer : All these occu
Description : In the common dry cell, the zinc atoms are: w) reduced at the cathode x) oxidized at the cathode y) oxidized at the anode z) reduced at the anode
Last Answer : ANSWER: Y -- OXIDIZED AT THE ANODE
Description : Iron is not used alone as a catalyst in ammonia synthesis, because (A) Its activity declines rapidly, if heated to above 520°C (B) It decomposes ammonia (C) It gets oxidised above 500°C (D) None of these
Last Answer : (A) Its activity declines rapidly, if heated to above 520°C
Description : Why magnesium oxidized occurs during the reaction of magnesium chloride?
Last Answer : What is the answer ?
Description : If the impurity in a metal has a greater affinity for oxygen and is more easily oxidised than the metal, then the purification of metal may be carried
Last Answer : If the impurity in a metal has a greater affinity for oxygen and is more easily oxidised than ... B. electrorefining C. Zone refining D. POILING
Description : To test chemical oxygen demand (C.O.D.) of sewage, organic matter is oxidised by potassium dichromate in the presence of A. Hydrochloric acid B. Sulphuric acid C. Nitric acid D. Citric acid
Last Answer : ANS: B
Description : Pick up the correct statement from the following: (A) In basic Bessemer process, the steel heats the converter (B) In open-hearth process, the furnace heats the steel (C) In Siemens process, the impurities of pig iron are oxidised by the oxygen of the ore (D) All the above
Last Answer : Answer: Option D
Last Answer : : Sulfur reacts with oxygen to produce so3 gas
Description : ’Drying oil’, oxidized spontaneously by atmospheric oxygen at ordinary temperature and forms a hard water proof material is (A) Coconut oil (B) Peanut oil (C) Rape seed oil (D) Linseed oil
Last Answer : Answer : D
Description : What happens when ethanol is oxidized by air in the presence of germs ?
Last Answer : Acetic acid is obtained when ethanol is oxidized by air in the presence of bacteria.
Description : During manufacture of H2SO4 , the oxidation of SO2 to SO3 by oxygen is an endothermic reaction. The yield of SO3 will be maximised, if the (A) Temperature is increased (B) Pressure is reduced (C) Temperature is increased and pressure is reduced (D) Temperature is reduced and pressure is increased
Last Answer : (D) Temperature is reduced and pressure is increased
Description : When a cell gains water what happens to its size and weight?
Last Answer : Need answer
Description : NADH is oxidised to `NAD^(+)` rather slowly in fermentation, however the reaction is very vigorous in case of aerobic respiration
Last Answer : NADH is oxidised to `NAD^(+)` rather slowly in fermentation, however the reaction is very vigorous in case of aerobic respiration
Description : NADH is oxidised to NAD in which reaction of glycolysis?
Last Answer : Lactate dehydrogenase reaction.
Description : Pick out the wrong statement. (A) Benzopyrene which causes cancer is present in traces in tobacco, charcoal & petrol driven automobile exhaust (B) NO2 is capable of penetrating the troposphere and ... at all produced during combustion of sulphur bearing fuels as all the sulphur is oxidised to SO2
Last Answer : (D) H2S is not at all produced during combustion of sulphur bearing fuels as all the sulphur is oxidised to SO2
Description : In the redox reaction agno3 plus makes and gtnano3 plus ag which element has been oxidized?
Description : Many living organisms exhibit the unique property of producing visible light. The compound that is oxidized with subsequent light emission is usually referred to as luciferin. What is the enzyme which catalyzes the reaction known as?
Last Answer : ANSWER: Luciferase
Description : Reaction between X and Y forms compound Z. X loses electron and Y gains electron. Which of the following properties is not shown by Z? A) Has high melting point B) Has low melting point C) Conducts electricity in molten state D) Occurs as solid
Last Answer : B) Has low melting point
Description : Assertion :- In a redox reaction, the oxidation number of the oxidant decreases while that of reductant increases. Reason :- Oxidant gains electron(s)
Last Answer : Assertion :- In a redox reaction, the oxidation number of the oxidant decreases while that of reductant ... D. If both Assertion & Reason are False.
Description : Concrete gains strength due to (A) Chemical reaction of cement with sand and coarse aggregates (B) Evaporation of water from concrete (C) Hydration of cement (D) All the above
Last Answer : Answer: Option C
Description : Concrete gains strength due to [ A ] Chemical reaction of cement with sand and coarse aggregates [ B ] Evaporation of water from concrete [ C ] Hydration of cement [ D ] All the above
Last Answer : [ C ] Hydration of cement
Description : The organic food that are oxidised during cellular respiration are known as?
Last Answer : respiratory substrates
Description : Steels with high carbon equivalent have poor Weldability, because in these steels during welding (A) Carbon and other alloying elements get oxidised from the weld pool (B) Excessive ferrite forms in the ... of carbon and other element occurs in the weld pool leading to poor properties of the weld
Last Answer : (C) Martensite forms in the heat affected zone leading to poor toughness/ductility of the weld
Description : During cellular respiration, glucose is oxidized completely to what two compounds?
Last Answer : ANSWER: CO2 (CARBON DIOXIDE) AND H2O (WATER)
Description : Hot conc. `H_(2)SO_(4)` acts as moderately strong oxidising agent. It oxidises both metals and non-metals. Which of the following elements is oxidised
Last Answer : Hot conc. `H_(2)SO_(4)` acts as moderately strong oxidising agent. It oxidises both metals and non-metals. Which ... products ? A. Cu B. S C. C D. Zn
Description : Give reason: When you exert pressure on air pillow, its size gets reduced.
Last Answer : The volume of air filled in the air pillow decreases as we increase the pressure.
Description : The pulmonary ventilation frequency (number of inhalations per time unit) rises or lowers the carbon dioxide concentration in blood. If it is intense the gas is more eliminated to the exterior and if it ... carbon dioxide and also of more hydrogen ions spending and the pH of the solution is raised.
Last Answer : What are acidosis and alkalosis?
Description : A journal bearing with hydrodynamic lubrication is running steadily with a certain amount of minimum film thickness. When the load and speed are doubled, how does the minimum film thickness vary? [IES-2008 ... Gets reduced to one-fourth of original value (d) Gets reduced to half of original value
Last Answer : (a) Remains unchanged
Description : In a heat exchanger with steam outside the tubes, a liquid gets heated to 45°C, when its flow velocity in the tubes is 2 m/s. If the flow velocity is reduced to 1 m/s, other things remaining ... than 45°C (B) More than 45°C (C) Equal to 45°C (D) Initially decreases and remains constant thereafter
Last Answer : (B) More than 45°C
Description : A number gets reduced to its one-third when 48 is subtracted from it. What is two-third of that number? 1. 22 2. 76 3. 36 4. 48 5. None of these
Last Answer : Answer:- 4 (48) Expalanation – let number be X X-48 = X/3 X-X/3 =48 2/3X= 48 so 2/3th of number=48
Description : The strength of concrete using air entraining cement gets reduced by (a) 5 to 10% (b) 10 to 15% (c) 15 to 20% (d) 20 to 25%
Last Answer : (b) 10 to 15%
Description : In an adjustable speed ac drive which quantity gets reduced above rated speed ? (A) developed torque (B) stator frequency (C) reduced starting torque (D) stator current
Last Answer : In an adjustable speed ac drive which quantity gets reduced above rated speed ? (A) developed torque (B) stator frequency (C) reduced starting torque (D) stator current