Description : In which organelle following reaction takes place 6 CO2 + 6 H2O + energy (from sunlight) ---------> C6H12O6 + 6 O2 (A) Mitochondrion (B) Peroxisome (C) Chloroplast (D) Glyoxysome
Last Answer : (C) Chloroplast
Description : C6H12O6 (aq) + 602(aq) →6CO2(aq) + 6H2O The above reaction is a/an (a) displacement reaction (b) endothermic reaction (c) exothermic reaction (d) neutralisation reaction
Last Answer : Answer: (c)
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 : What does the formula CO2 plus H2O plus energy -C6H12O6 represent?
Last Answer : Production of glucose in plants
Description : C6H12O6 + 602 —>6O2 + 6HZO shows- (a) Photosynthesis (b) Respiration (c) Oxidation (d) Translocation of food mate-rials
Last Answer : (b) Respiration
Description : A photosynthesising plant is releasing 18O more than the normal. The plant must have been supplied with (a) O3 (b) H2O with 18O (c) CO2 with 18O (d) C6H12O6 with 18O.
Last Answer : (b) H2O with 18O
Description : Consider the reaction, C + O2 ⇌ CO2; ΔH = - 94 kcal. What will be the value of ΔH for the reaction CO2 → C + O2? (A) -94 kcal (B) +94 kcal (C) > 94 kcal (D) < -94 kcal
Last Answer : (B) +94 kcal
Description : In the reaction, C + O2 → CO2; ΔH = - 94 kcal. What is the heat content (enthalpy) of O2? (A) -94 kcal (B) > -94 kcal (C) < - 94 kcal (D) Zero
Last Answer : (D) Zero
Description : If you start with 32 grams of CH4 and react it with O2 to form 88 grams CO2 and 72 grams H2O. How much O2 in grams was consumed?
Last Answer : 128 g of oxygen are needed.
Description : In Orsat's apparatus, ammoniacal cuprous chloride is used for selectivity absorbing (A) CO (B) CO2 (C) O2 (D) H2O
Last Answer : (A) CO
Description : A sample of natural gas containing 80% methane (CH4 ) and rest nitrogen (N2 ) is burnt with 20% excess air. With 80% of the combustibles producing CO2 and the remainder going to CO, the Orsat analysis in volume percent is (A) CO2 : 6 ... 96, N2 :72.06 (D) CO2 : 7.60, CO : 1.90, O2 : 4.75, N2 : 85.74
Last Answer : (B) CO2 : 7.42, CO : 1.86, O2 : 4.64, N2 :86.02
Description : The point of ultra-supercritical steam generator is to save on coal to heat the water and reduce ________ emissions. a. Oxygen (O2) b. Water (H2O) c. Carbon dioxide (CO2) d. Both ‘a’ and ‘c’
Last Answer : c. Carbon dioxide (CO2)
Description : Which of these molecules is bound by ionic bonds? w) H2O x) CH4 y) NaCl z) C6H12O6
Last Answer : ANSWER: Y -- NaCl
Description : Entropy change of the reaction, H2O (liquid) → H2O (gas), is termed as the enthalpy of (A) Solution (B) Vaporisation (C) Formation (D) Sublimation
Last Answer : (B) Vaporisation
Description : (a) What are fuel cells? Explain the electrode reactions involved in the working of H2 – O2 fuel cell. (b) Represent the galvanic cell in which the reaction Zn (s) + Cu2+ (aq) → Zn2+ (aq) + Cu (s) takes place. -Chemistry
Last Answer : (a) Fuel cells : These cells are the devices which convert the energy produced during combustion of fuels like H2, CH4, etc. directly into electrical energy. The electrode reaction for H2 – O2 fuel cell : (b) The galvanic cell may be represented as Zn (s) | Zn2+ (1M) || Cu2+ (1M) | Cu (s)
Description : The following reaction is characteristic of what type of enzymes? 2H2O2 → 2H2O + O2 (A) Peroxides (B) Catalase (C) Dehydrogenase (D) Copper containing oxidases
Last Answer : Answer : B
Description : When 9.OO g C6H12O6 burns with excess oxygen how many grams of CO2 will be made?
Last Answer : 13,19 g carbon dioxide are obtained.
Description : Calcination reaction of limestone (CaCO3 → CaO + CO2 ) goes to completion in the rotary kiln, because (A) CaO is not dissociated (B) CO2 escapes continuously (C) Of high calcination temperature (D) CaO is more stable than CaCO3
Last Answer : (B) CO2 escapes continuously
Description : Identify the type of reaction(s) in the following equations. (i)CH4 + 2O2 CO2 + 2 H2O (ii) Pb(NO3)2 + 2KI ——–>Pbl2 + 2KNOs (iii) CaO + H2O ——–> Ca(OH)2 (iv) CuSO4 + Zn ——–> ZnSO4 + Cu -Chemistry
Last Answer : Answer. (i) Combustion reaction and oxidation reaction. (ii)Double displacement reaction and precipitation reaction. (iii) Combination reaction. (iv) Displacement reaction.
Description : Which of the following reactions occuring during coal gasification is called the Neumann reversal reaction? (A) 2CO ↔ C + CO2 (B) CO + H2O ↔ CO2 + H2 (C) C + H2O ↔ CO + H2 (D) C + 2H2O ↔ CO2 + 2H2
Last Answer : (A) 2CO ↔ C + CO2
Description : The shift conversion reaction taking place during water gas manufacture is given by (A) C + H2O ↔ CO + H2 (B) C + 2H2O ↔ CO2 + 2H2 (C) CO + H2O ↔ CO2 + H2 (D) None of these
Last Answer : (C) CO + H2O ↔ CO2 + H2
Description : Given, 3H2 + CO = CH4 + H2O, KP = 10 1.84 and, 4H2 + CO2 = CH4 + 2H2O, KP = 10 1.17 the KP for the reaction CO + H2O = CO2 + H2 is (A) 10 3.01 (B) 10 -0.67 (C) 10 -3.01 (D) 10 0.67
Last Answer : (D) 10 0.67
Description : Pick out the exothermic reaction out of the following: (A) C + H2O = CO + H2 (B) CaC2 + H2O = Ca(OH)2 + C2H2 (C) MgCO3 = MgO + CO2 (D) All (A), (B) and (C)
Last Answer : (B) CaC2 + H2O = Ca(OH)2 + C2H2
Description : Pick out the endothermic reaction out of the following. (A) C+ ½O2 = CO (B) CO + 3H2 = CH4 + H2O (C) CaCO3 = CaO + CO2 (D) CO + ½O2 = CO2
Last Answer : (C) CaCO3 = CaO + CO2
Description : Forward reaction will be favoured for the exothermic reaction, represented by CO + H2O ⇌ CO2 + H2, by (A) Low temperature and high pressure (B) Low temperature and low pressure (C) High temperature and high pressure (D) High temperature and low pressure
Last Answer : (A) Low temperature and high pressure
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 : What of the following reactions demonstrates a synthesis reaction A) Mg plus H2SO4 and gt MgSO4 plus H2 B) 2NaCl and gt 2Na plus Cl2 C) C plus O2 and gt CO2 D) Zn plus 2HCl and gt ZnCl2 plus H2?
Last Answer : C+O2 →CO2
Description : Photo chemical smog is a result-ant of the reaction among – (1) High concentration of NO2, O3, and CO in the evening (2) CO, CO2 and NO2 at low temperature (3) CO, O2 and peroxy acetyl nitrate in the presence of Sunlight (4) NO2, O3 and peroxy acetyl nitrate in the presence of Sunlight
Last Answer : (4) NO2, O3 and peroxy acetyl nitrate in the presence of Sunlight Explanation: Photochemical smog is a unique type of air pollution which is caused by reactions between sunlight and pollutants like hydrocarbons and nitrogen dioxide (NO and NO2).
Description : The combustion reaction, C + O2 = CO2 , is (A) Exothermic (B) Endothermic (C) Autocatalytic
Last Answer : (A) Exothermic
Description : The combustion reaction, C + O2 = CO2 , is (A) Exothermic (B) Endothermic (C) Autocatalytic (D) None of these
Description : If glucose-1-phosphate formed by glycogenoloysis in muscles is oxidized to CO2 and H2O, the energy yield will be (A) 2 ATP equivalents (B) 3 ATP equivalents (C) 4 ATP equivalents (D) 8 ATP equivalents
Description : How many ATP molecules could maximally be generated from one molecule of glucose, if the complete oxidation of one mole of glucose to CO2 and H2O yields 686 kcal and the useful chemical energy available in the high energy phosphate bond of one mole of ATP is 12 kcal? (a) 1 (b) 2 (c) 30 (d) 57
Last Answer : d) 57
Description : This early atmosphere was rich in CO2 and H2O. How did oxygen enter our atmosphere? (a) Meteorites. (b) From organisms that evolved to convert CO2 and H20 into sugars (energy), resulting in the waste product oxygen. (c) Volcanic emissions. (d) Methanogenic bacteria.
Last Answer : (b) From organisms that evolved to convert CO2 and H20 into sugars (energy), resulting in the waste product oxygen.
Description : When a co-ordination compound CrCl3.6H2O is mixed with AgNO3, 2 moles of AgCl are precipitated per mole of the compound. Write (i) Structural formula of the complex. (ii) IUPAC name of the complex. -Chemistry
Last Answer : (i) The complex formed on mixing a coordination compound CrCl3.6H2O with AgNO3 is as follows CrCl3.6H2O + AgNO3 → [Cr(H2O5)Cl]Cl2. H2O (ii) Pentaaquachloridochromium (III) chloride monohydrate
Description : Which of the following(s) is/are the products of the light reactions of photosynthesis? A.ATP only B.NADPH only C.ATP and O2 only D.ATP, NADPH, and O2
Last Answer : D.ATP, NADPH, and O2
Description : Answer the following S. No Statement Chose the correct answer OR Fill-in-the-blanks 1 Fyrite measures CO2, O2 and SO2 True/False 2 Ultrasonic Flow Meter uses the principle of____& ____ Fill in the ... of RPM meter is used and for a visible shaft-end _______ type of RPM meter is used.
Last Answer : Sr No Statement Chose the correct answer OR Fill-in-the-blanks Solution 1 Fyrite measures CO2, O2 and SO2 True/False False 2 Ultrasonic Flow Meter uses the principle of____& ____ ... ] 10 In a gasification system the reduction zone is above the combustion zone True/False False
Description : How many atoms in 6O2?
Last Answer : There are 12 atoms in 6 O2 molecules.
Description : Naphthenic acid is represented by (A) CnH2n+2O2 (B) CnH2n-2O2 (C) CnH2n+2O2 (n ≥ 6) (D) CnH2n+6O2 (n ≤ 6)
Last Answer : (B) CnH2n-2O2
Description : What are amphoteric oxides? Choose the amphoteric oxides from amongst the following oxides: Na2O, ZnO, Al2O3, CO2, H2O -Chemistry
Last Answer : Those oxides which reacts with acids as well as bases to produce salts and water are called amphoteric oxides, e.g. Na2O, ZnO, are amphoteric oxides among given oxides.
Description : How many hydrogen atoms are in CH3COONa plus H2O plus CO2?
Last Answer : CH3COONa plus H2O plus CO2 has 5 Hydrogen, 3 carbon, 5 oxygen,and 1 Sodium
Description : What make H2CO3. Ans you can make H2CO3 by CO2 plus H2O H2CO3 if you want to make sodium hydrogen carbonate then you can make it like this Na plus H2CO3 NaHCO3?
Last Answer : The correct chemical equation is:Na2CO3 + CO2 + H2O = 2 NaHCO3
Description : Complete oxidation of one molecule of glucose into CO2 and H2O yields (A) 8 ATP equivalents (B) 15 ATP equivalents (C) 30 ATP equivalents (D) 38 ATP equivalents
Last Answer : Answer : D
Description : End product of aerobic glycolysis is (A) Acetyl CoA (B) Lactate (C) Pyruvate (D) CO2 and H2O
Last Answer : Answer : C
Description : Alcohol dehydrogenase converts ethanol into (A) Acetyl CoA (B) Acetaldehyde (C) Acetate (D) CO2 and H2O
Description : Water gas is the combination of – (1) CO and H2 (2) CO2 and H2 (3) CO and H2O (4) CO2 and CO
Last Answer : (1) CO and H2 Explanation: Water has is a synthesis gas, containing carbon monoxide (CO) and hydrogen has (H2). It is made by passing steam over a redhot carbon fuel such as coke. The reaction between steam and hydrocarbons produce the has mixture.
Description : Gobar gas contains mainly (a) CO2 + H2 (b) CO2 + H2O (c) CH4 only (d) CH4 + CO2.
Last Answer : (d) CH4 + CO2.
Description : End product of citric acid cycle/Krebs’ cycle is (a) citric acid (b) lactic acid (c) pyruvic acid (d) CO2 + H2O
Last Answer : (d) CO2 + H2O.