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 : What information do you get from the following chemical equation: Zn(s) + 2HCl (dil) → ZnCl2 (aq) + H2(g)
Last Answer : This gives zinc chloride and hydrogen. The word equation is: Zinc + Hydrochloric acid → Zinc chloride + Hydrogen Formulae for the products are ZnCl2 and H2
Description : As the surface area of the Zn(s) used in the reaction Zn(s) + 2HCl(aq)--> ZnCl2(aq) + H2(g) is increased, the rate of the reaction willIncreaseDecreaseRemain the Same?
Last Answer : An increase in surface area means an increase in the rate of reaction.
Description : Zn + 2 HCl = H2 + ZnCl, is an example of which type of reaction? (1) Double displacement reaction (2) Combination reaction (3) Single displacement reaction (4) Decomposition reaction
Last Answer : (3) Single displacement reaction Explanation: This reaction is an example of single displacement reaction. In Substitution or Single Replacement Reactions, a single free element replaces or is substituted for one of the elements in a compound.
Description : Which of the following reagents can be used to distinguish between chlorobenzene and allyl chloride? (a) H2/Ni (b) Br2 in CCl4 (c) Zn/HCl (d) NH2NH2
Last Answer : Br2 in CCl4
Description : Cyclohexanol can be converted into cyclohexene by heating with (a) Zn(Hg) and HCl (b) Concentrated H2SO4 (c) SOCl2 (d) H2 and Ni
Last Answer : Concentrated H2SO4
Description : Starting with 2-butene, which of the following is the best method for preparing 2-butyne? (a) HBr; H2/Ni; Zn/H+ (b) HBr; Zn/H+; H2/Ni (c) Br2/CCl4; Zn/H+; H2/Ni (d) Br2/CCl4; 2NaNH2
Last Answer : Br2/CCl4; 2NaNH2
Description : Sodium reacts with water to form sodium hydroxide and hydrogen gas. The balanced equation which represents the above reaction is (a) Na(s) + 2H20(l) → 2NaOH(aq) + 2H2(g) (b) 2Na(s) + 2H2O(l) → 2NaOH(aq) +H2(g) (c) 2Na(s) + 2H20(l) → NaOH(aq) + 2H2(g) (d) 2Na(s) + H20(l) - 2NaOH(aq) + 2H2(g)
Last Answer : Answer: (b)
Description : A `C_(6)H_(12)O` compound does not react with `Br_(2)` in `C Cl_(4)`, produces a flammable gas on treatment with `LiAlH_(4)`, and reacts with `H_(2)Cr
Last Answer : A `C_(6)H_(12)O` compound does not react with `Br_(2)` in `C Cl_(4)`, ... B. methoxycyclopentane C. 2-cyclopropyl-2-propanol D. 2-cyclobutylethanol
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 : The metal that does not give H2 on treatment with dilute HCl is (a) Zn (b) Fe (c) Ag (d) Ca
Last Answer : Ans:(c)
Description : Identify the compound X and A on the basis of the reaction given below. X +Zn A + H2 (a)X is Sodium hydroxide and A is sodium zincate (b)X is Sodium hydroxide and A is sodium chloride©X is sodium hyroxide and A is sodium ethanoate (d)Both a and c
Last Answer : (a)X is Sodium hydroxide and A is sodium zincate
Description : when a carbonate reacts with an acid,it produces carbon dioxide gas. how can this reaction be used in our dairy life -Biology
Last Answer : answer:
Description : Benzene reacts with H2 at 150°C at 30 atm in the presence of Ni catalyst to give (a) Cyclohexane (b) Cyclohexene (c) n-Hexane (d) No reaction occurs
Last Answer : Cyclohexane
Description : Compound (A) reacts with sodium metal to form one mole of H2. The compound (A) can be (a) CH3CH2CH=CH2 (b) HOCH2CH2CH2CH2OH (c) CH=CH–CH=CH2 (d) CH3CH2CH2CH2OH
Last Answer : HOCH2CH2CH2CH2OH
Description : Find the work done is calorie when `65.5g` Zn reacts with excess `H_(2)SO_(4)` (aq) to form `ZnSO_(4)` & `H_(2)` in a closed rigid vessel at `300 K`.
Last Answer : Find the work done is calorie when `65.5g` Zn reacts with excess `H_(2)SO_(4)` (aq) to form `ZnSO_(4)` & `H_ ... `. A. -600 B. 0 C. `-1200` D. `-2494`
Description : In the manufacture of H3 PO4 (ortho); strong H2 SO4 leaching wet process as compared to electric furnace process (A) Uses lower grade phosphate rock (B) Requires lower capital investment in the plant (C) Produces lower purity acid (D) Is very costly
Last Answer : (C) Produces lower purity acid
Description : What Sodium (Na) and water (H2O) undergo a chemical reaction that produces sodium hydroxide (NaOH and hydrogen gas (H2). Which equation represents this chemical reaction?
Last Answer : 2Na+2H20->2Na0H+H2 ::::apex
Description : Benzaldehyde reacts with a mixture of concentrated sulfuric acid and nitric acid to give (a) p-Nitrobenzaldehyde (b) o-Nitrobenzaldehyde (c) p-Nitrobenzoic acid (d) m-Nitrobenzaldehyde
Last Answer : m-Nitrobenzaldehyde
Description : When an inorganic compound reacts with `SO_2` in aqueous medium produces `(A). (A)` on reaction with `Na_2 CO_3` gives the compound `(B)` which with s
Last Answer : When an inorganic compound reacts with `SO_2` in aqueous medium produces `(A). (A)` on reaction with `Na_2 CO_3` ... C. `Na_(2)S` D. `Na_(2)SO_(3)`
Description : Which of the following anions are producing same gas on treatment with `(Zn+ " dil." H_(2)SO_(4))`. `I :SO_(3)^(2-) " " II : HSO_(3)^(-) " " III : S^(
Last Answer : Which of the following anions are producing same gas on treatment with `(Zn+ " dil." H_(2)SO_(4))`. `I : ... I, II, III and IV D. I, III and IV only
Description : In the balanced equation - `[Zn+H^(+)+NO_(3)^(-)rarr NH_(4)^(-) rarr NH_(4)^(+) +Zn^(+2)+H_(2)O]` coefficient of `NH_(4)^(+)` is :-
Last Answer : In the balanced equation - `[Zn+H^(+)+NO_(3)^(-)rarr NH_(4)^(-) rarr NH_(4)^(+) +Zn^(+2)+H_(2)O]` coefficient ... (4)^(+)` is :- A. 4 B. 3 C. 2 D. 1
Description : (mixture of alkenes) `overset((i) O_(3))underset((ii) Zn//H_(2)O)to` (mixture of carbonyl compounds). The incorrect statement is
Last Answer : (mixture of alkenes) `overset((i) O_(3))underset((ii) Zn//H_(2)O)to` (mixture of ... KOH D. Only two carbonyl compounds give positive idoform test
Description : Name the metal M which is extracted on the basis of following reactions: `4M+8NaCN+2H_(2)O+O_(2)to` `4NaM(CN)_(2)+4NaOH` `2NaM(CN)_(2)+ZntoNa_(2)Zn(CN
Last Answer : Name the metal M which is extracted on the basis of following reactions: `4M+8NaCN+2H_(2)O+O_(2)to` `4NaM(CN)_(2 ... 2M` A. Au or Ag B. Hg C. Ni D. Fe
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 : The following statement is true about misoprostol: A. It relieves peptic ulcer pain, but does not promote ulcer healing B. It heals nonsteroidal antiinflammatory drug induced gastric ulcer not responding ... side effects than H2 blockers D. It is the most effective drug for preventing ulcer relapse
Last Answer : B. It heals nonsteroidal antiinflammatory drug induced gastric ulcer not responding to H2 blockers
Description : What gas is given off when an acid reacts with chalk?
Last Answer : ANSWER: CARBON DIOXIDE
Description : `5H_(2)C_(2)O_(4)(aq)+2MnO_(4)(aq)+6H^(+)(aq) to 2Mn^(2+)(aq)+10CO_(2)(g)+8H_(2)O(l)` Oxalic acid, `H_(2)C_(2)O_(2)` , reacts with permanganate ion ac
Last Answer : `5H_(2)C_(2)O_(4)(aq)+2MnO_(4)(aq)+6H^(+)(aq) to 2Mn^(2+)(aq)+10CO_(2)(g)+8H_(2)O(l)` Oxalic acid, `H_ ... A. 13.5 mL B. 18.5 mL C. 33.8 mL D. 84.4 mL
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 : Acetophenone reacts with Br2 in the presence of FeCl3 to form : (a) m-Bromoacetophenone (b) m-Dibromobenzene (c) o- + p-Bromoacetophenone (d) p-Dibromobenzene
Last Answer : m-Bromoacetophenone
Description : Phenol reacts with excess bromine water to give (a) o- plus p-Bromophenol (b) Bromobenzene (c) 2,4,6-Tribromophenol (d) m-Bromophenol
Last Answer : 2,4,6-Tribromophenol
Description : Benzenediazonium chloride reacts with KI to form : (a) Benzenediazonium iodide (b) m-Diiodobenzene (c) Iodobenzene (d) o- plus p-Diiodobenzene
Last Answer : Iodobenzene
Description : Aniline reacts with bromine water to form (a) Bromobenzene (b) m-Bromoaniline (c) 2,4,6-Tribromoaniline (d) o- plus p-Bromoaniline
Last Answer : 2,4,6-Tribromoaniline
Description : Nitrobenzene reacts with Br2 in the presence of FeCl3 to give (a) o-chloronitrobenzene (b) o-bromonitrobenzene (c) m-chloronitrobenzene (d) m-bromonitrobenzene
Last Answer : m-bromonitrobenzene
Description : Toluene reacts with chlorine in the presence of AlCl3 to give (a) o-Chlorotoluene (b) o- plus p-Chlorotoluene (c) m-Chlorotoluene (d) o- plus m-Chlorotoluene
Last Answer : o- plus p-Chlorotoluene
Description : Toluene reacts with bromine in the presence of uv light to give (a) m-Bromotoluene (b) Benzyl bromide (c) o-Bromotoluene (d) Benzoyl bromide
Last Answer : Benzyl bromide
Description : An unknown substance (P) functions as weak base in water. It produces silver mirror test. It reacts with dilute `HCl` to produce (Q) which turns blue
Last Answer : An unknown substance (P) functions as weak base in water. It produces silver mirror test. It reacts with dilute `HCl` ... ` C. `NH_(2)OH` D. `HPO_(3)`
Description : `XeF_6` on partial hydrolysis with water produces a compound ‘X’. The same compound ‘X’ is formed when `XeF_6` reacts with silica. The compound ‘X’ Is
Last Answer : `XeF_6` on partial hydrolysis with water produces a compound X'. The same compound X' is formed when `XeF_6` ... XeF_4` C. (3)`XeF_2` D. (4)`XeOF_4`
Description : When a compound X reacts with ozone in aq medium, a compound Y is produced. Ozone also reacts with moist Y and produces compound Z. Z acts as an oxidi
Last Answer : When a compound X reacts with ozone in aq medium, a compound Y is produced. Ozone also reacts with moist Y and ... `X=HI, Y=I_(2) and Z=HIO_(4)`
Description : elect the drug which relieves anxiety but neither reacts with benzodiazepine receptor nor produces any overt CNS effect: A. Oxazepam B. Thioproperazine C. Buspirone D. Chlordiazepoxide
Last Answer : C. Buspirone
Description : Naphthalene undergoes reduction with H2 in the presence of Ni catalyst at high temperature and pressure to give (a) Phthalic acid (b) Decalin (c) Benzoic acid (d) Tetralin
Last Answer : Decalin
Description : Reduction of acetaldehyde with H2/Ni gives (a) Ethyl alcohol (b) Acetic acid (c) Ethylene (d) Ethane
Last Answer : Ethyl alcohol
Description : The conjugate acid of water is: w) OHx) H2 y) O2 z) H3O+
Last Answer : ANSWER: Z -- H3O+
Description : Which gas is used for converting vegetable oils into saturated fats? (1) H2 (2) O2 (3) Cl2 (4) SO2
Last Answer : (1) H2 Explanation: Hydrogenation - to treat with hydrogen - is a chemical reaction between molecular hydrogen (H2) and another compound or element, usually in the presence of a catalyst. ... oils are derived from polyunsaturated fatty acids (containing more than one carbon-carbon double bonds).
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 : LPG (Household cooking gas) is mainly a mixture of (a) Methane + Ethane (b) Acetylene + O2 (c) Butane + Isobutane (d) Acetylene + H2
Last Answer : Butane + Isobutane
Description : Which gas is used for converting vegetable oils into saturated fats ? (1) H2 (2) O2 (3) Cl2 (4) SO2
Last Answer : H2