Description : Metal sulphides occur mainly in rocks and metal halides in lakes and seas. Explain.
Last Answer : Ans.: Metal halides being soluble in water, get dissolved in rain water and are carried to lakes and seas during weathering of rocks. On the otherhand, metal sulphides being insoluble are left behind in the rocks as residue.
Description : Assertion :- At constant temp `0^(@)C` and 1 atm, the change `H_(2)O(s)rarr H_(2)O(l)Delta H` and `Delta E` both are zero. Reason :- During isothermal
Last Answer : Assertion :- At constant temp `0^(@)C` and 1 atm, the change `H_(2)O(s)rarr H_(2)O(l) ... Reason is False. D. If both Assertion & Reason are false.
Description : If, `H_(2)(g)+Cl_(2)(g)rarr 2HCl(g) , Delta H^(@)=-44` Kcal `2Na(s)+2HCl(g)rarr 2NaCl(s)+H_(2)(g), Delta H=-152` Kcal Then, `Na(s)+0.5Cl_(2)(g)rarr Na
Last Answer : If, `H_(2)(g)+Cl_(2)(g)rarr 2HCl(g) , Delta H^(@)=-44` Kcal `2Na(s)+2HCl(g)rarr 2NaCl(s)+H_(2)( ... ` A. 108 Kcal B. 196 Kcal C. `-98` Kcal D. 54 Kcal
Description : The heat of combustion of `CH_(4(g)), C_((g))` and `H_(2(g))` at `25^(@)C` are `-212.4` K cal, -94.0 K cal and -68.4 K cal respectively, the heat of f
Last Answer : The heat of combustion of `CH_(4(g)), C_((g))` and `H_(2(g))` at `25^(@)C` are `-212.4` K cal, -94.0 ... .4` K cal C. `-375.2` K cal D. `+212.8` K cal
Description : `Delta_(f)^(@)` for `CO_(2(g)), CO_((g))` and `H_(2)O_((g))` are `-393.5,-110.5` and `-241.8kJ mol^(-1)` respectively. The standard enthalpy change `(
Last Answer : `Delta_(f)^(@)` for `CO_(2(g)), CO_((g))` and `H_(2)O_((g))` are `-393.5,-110.5` and `-241.8kJ mol^(-1 ... A. `524.1` B. `41.2` C. `-262.5` D. `-41.2`
Description : Which of the following is true fo the reacion `H_(2)O(l)hArr H_(2)O(g)` at `100^(@)C` and 1 atmosphere
Last Answer : Which of the following is true fo the reacion `H_(2)O(l)hArr H_(2)O(g)` at `100^(@)C` and 1 atmosphere ... Delta H = Delta E` D. `Delta H = T Delta S`
Description : Calculate the entropy of `Br_(2)(g)` in the reaction `H_(2)(g)+Br_(2)(g)rarr2HBr(g), Delta S^(@)=20.1 JK^(-1)` given, entropy of `H_(2)` and HBr is 13
Last Answer : Calculate the entropy of `Br_(2)(g)` in the reaction `H_(2)(g)+Br_(2)(g)rarr2HBr(g), Delta S^(@)=20.1 JK^(-1 ... ` C. `24.63 JK^(-1)` D. `20 KJK^(-1)`
Description : The value of enthalpy change `(DeltaH)` for the reaction `C_(2)H_(5)OH (l)+3O_(2) (g) rarr 2CO_(2) (g) +3H_(2)O (l)` at `27^(@)C` is `-1366.5 kJ mol^(
Last Answer : The value of enthalpy change `(DeltaH)` for the reaction `C_(2)H_(5)OH (l)+3O_(2) (g) rarr 2CO_(2) (g) + ... 1369. kJ` C. `-1364.0 kJ` D. `-1361.5 kJ`
Description : For a phase change: `H_(2)O(l)hArrH_(2)O(s)` `0^(@)C`, 1 bar
Last Answer : For a phase change: `H_(2)O(l)hArrH_(2)O(s)` `0^(@)C`, 1 bar A. `Delta G = 0` B. `Delta S = 0` C. `Delta H = 0` D. `Delta U = 0`
Description : For a reaction `H_(2(g))+I_(2(g))rArr2HI_((g))at 721^(@)C` the value of equilibrium constant is 50 . If 0.5 moles each of `H_(2)` & `I(2)` is added to
Last Answer : For a reaction `H_(2(g))+I_(2(g))rArr2HI_((g))at 721^(@)C` the value of equilibrium constant is 50 . ... constant will be . A. 100 B. 25 C. 50 D. 200
Description : If `0.5 `mole `H_(2)` is reacted with 0.5 mole `I_(2)` in a ten `-` litre container at `444^(@)C` and at same temperature value of equilibrium constan
Last Answer : If `0.5 `mole `H_(2)` is reacted with 0.5 mole `I_(2)` in a ten `-` litre container at `444^(@)C` and at ... B. `(1)/(7)` C. `sqrt((1)/(7))` D. 49
Description : At `25^(@)` C for complete combustion of 5 mol propane `(C_(3)H_(8))` . The required volume of `O_(2)` at STP will be .
Last Answer : At `25^(@)` C for complete combustion of 5 mol propane `(C_(3)H_(8))` . The required volume of `O_(2)` at ... . A. 560 L B. 560 mL C. 360 L D. 360 mL
Description : What volume of oxygen gas `(O_(2))` measured at `0^(@)C` and 1 atm, is needed to burn completely 1L of propane gas `(C_(3)H_(8))` measured under the s
Last Answer : What volume of oxygen gas `(O_(2))` measured at `0^(@)C` and 1 atm, is needed to burn completely 1L of propane gas ... ? A. 5 L B. 10 L C. 7 L D. 6 L
Description : `C_(6)H_(5)NH_(2) overset(NaNO_(2)+HCl)underset(0-5^(@)C) X overset(H_(2)O)underset(Delta)toY,` the product is :
Last Answer : `C_(6)H_(5)NH_(2) overset(NaNO_(2)+HCl)underset(0-5^(@)C) X overset(H_(2)O) ... : A. Benzenediazonium chloride B. Nitrobenzene C. Phenol D. Cresol
Description : In the reaction, `C_(6)H_(5)NH_(2)underset(0-5^(@)C)overset(NaNO_(2)+HCl)rarr(A)underset(KCN)overset(CuCN)rarr(B)overset(H^(+)//H_(2)O)rarr(C)` the pr
Last Answer : In the reaction, `C_(6)H_(5)NH_(2)underset(0-5^(@)C)overset(NaNO_(2)+HCl)rarr(A)underset(KCN)overset(CuCN ... COOH` C. `C_(6)H_(5)OH` D. none of these
Description : Optically active amine having molecular formula `C_(5)H_(13)N` on reaction with `NaNO_(2)+HCI` produces, `3^(@)` optically inative alcohol. Find out s
Last Answer : Optically active amine having molecular formula `C_(5)H_(13)N` on reaction with `NaNO_(2)+HCI` produces, ` ... out structures of amines: A. B. C. D.
Description : What are X and Y in the reaction `C_(2)H_(4) + H_(2)SO_(4) overset(80^(@)C)rarr X overset(H_(2)O//Delta)rarr Y`
Last Answer : What are X and Y in the reaction `C_(2)H_(4) + H_(2)SO_(4) overset(80^(@)C)rarr X overset(H_(2)O//Delta) ... C_(2)H_(5)OH` D. `C_(2)H_(2), CH_(3)CHO`
Description : An organic liquid `A` containing `C,H` and `O` has a pleasant odour with a boiling point of `78^(@)C`. On boiling. A with conc. `H_(2)SO_(4)` a colour
Last Answer : An organic liquid `A` containing `C,H` and `O` has a pleasant odour with a boiling point of `78^(@)C`. On boiling ... . `C_(2)H_(5)OH` D. `C_(2)H_(6)`
Last Answer : An organic liquid `A` containing `C,H` and `O` has a pleasant odour with a boiling point of `78^(@)C`. On boiling ... . `C_(2)H_(6)` D. `C_(2)H_(5)OH`
Description : Formation of which of the sulphides is most spontaneous?
Last Answer : Formation of which of the sulphides is most spontaneous? A. HgS B. `Bi_(2)S_(3)` C. PbS D. `Cs_(2)`
Description : Which one of the following basic radical (s) `is//are ` precipitated as sulphides in acidic medium in qualitative analysis?
Last Answer : Which one of the following basic radical (s) `is//are ` precipitated as sulphides in acidic medium in qualitative analysis ... `Cd^(2+)` D. `Zn^(2+)`
Description : The commonest form of iron & manganese found in ground water as pollutant is in the form of their (A) Carbonates (B) Bi-carbonates (C) Chlorides (D) Sulphides
Last Answer : (B) Bi-carbonates
Description : Fluorosis (a bone disease) is caused by the presence of high concentration of __________ in atmospheric air. (A) Hydrocarbons (B) Hydrogen fluoride (C) Hydrogen sulphides (D) Nitrogen dioxide
Last Answer : (B) Hydrogen fluoride
Description : Which of the following is an yellow pigment? (A) Titanium dioxide (B) Ferrous sulphate (C) Lead chromates (D) Zinc sulphides
Last Answer : (C) Lead chromates
Description : Presence of carbonaceous matter in the sewage (A) Causes reduction in its dissolved oxygen content thereby endangering the life of aquatic creatures (B) Reduces sulphate ions to sulphides causing obnoxious ... quantity of chlorine used for its purification (D) All (A), (B) and (C)
Last Answer : (D) All (A), (B) and (C)
Description : Pick up the incorrect statement from the following: (A) Iron salts produce heavy flocks and hence remove more suspended matter (B) Iron salts remove hydrogen sulphides (C) Iron salts can be used over a limited range of pH values (D) Iron salts impart corrosiveness to water
Last Answer : (C) Iron salts can be used over a limited range of pH values
Description : Mathamoglobinemia or blue baby disease is caused due to (A) Chlorides (B) Nitrites (C) Nitrates (D) Sulphides
Last Answer : (C) Nitrates
Description : Root exudates of wheat and oats which has detrimental effects on wild mustard con tain a). Phenolic acid b). Alkaloids c). Sulphides d). Lactones
Last Answer : a). Phenolic acid
Description : Consider the following reactions at `1000^(@)C`. (A) `Zn_((s))+1/2 O_(2(g)) rarr ZnO_((s)), DeltaG^(@)=-360` kJ/mol (B) `C_("(gra)")+1/2 O_(2(g)) rarr
Last Answer : Consider the following reactions at `1000^(@)C`. (A) `Zn_((s))+1/2 O_(2(g)) rarr ZnO_((s)), DeltaG^( ... a) and (b) are true D. both (a) and (b) false
Description : Consider the following reaction at `1000^(@)C` `(A) Zn_((s))+(1)/(2)O_(2(s))+ZnO_(s),DeltaG^(0)=-360kJ"mole"^(-1)` (B) `(B) Cn_((s))+(1)/(2)O_(2(g))to
Last Answer : Consider the following reaction at `1000^(@)C` `(A) Zn_((s))+(1)/(2)O_(2(s))+ZnO_(s),DeltaG^ ... 1 and 2 are true D. Both statement 1 and 2 are false
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 : 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 : In the following figure, if `/_ AOB =60^(@)` then `/_ ACB=30^(@)`. [True `//` False `//` Cannot say ]
Last Answer : In the following figure, if `/_ AOB =60^(@)` then `/_ ACB=30^(@)`. [True `//` False `//` Cannot say ]
Description : For the formation of metal oxide, `deltaG^(@)` __________ with increase in temperature.
Last Answer : For the formation of metal oxide, `deltaG^(@)` __________ with increase in temperature. A. Only I B. I,II only C. I,II,III only D. All
Description : The major limitation of metallic recuperated is ------- a) Limitation of handling COx, NOx etc. b) Limitation of reduced life for handling temperature more than 1000 oC c) Manufacturing difficulty of the required design d) None of the above
Last Answer : Limitation of reduced life for handling temperature more than 1000 oC
Description : Concentrated `H_(2)SO_(4)` cannot be used to prepare HBr from NaBr , because it ,
Last Answer : Concentrated `H_(2)SO_(4)` cannot be used to prepare HBr from NaBr , because it , A. (A) ... (C) disproportionates HBr D. (D) reacts slowly with NaBr
Last Answer : Concentrated `H_(2)SO_(4)` cannot be used to prepare HBr from NaBr , because it ,
Description : Assertion: Conc `H_(2)SO_(4)` cannot be used for drying up `H_(2)S` Reason : Conc `H_(2)SO_(4)` oxidises `H_(2)S` to S
Last Answer : Assertion: Conc `H_(2)SO_(4)` cannot be used for drying up `H_(2)S` Reason : Conc `H_(2 ... D. Statement-I is not correct and Statement-II is correct
Description : Assertion:- `SF_(6)` cannot be hydrolysed but `SF_(4)` can be. Reason:- Six F atoms in `SF_(6)` prevent the attack of `H_(2)O` on sulphur atom of `SF_
Last Answer : Assertion:- `SF_(6)` cannot be hydrolysed but `SF_(4)` can be. Reason:- Six F atoms in ` ... D. Statement-I is not correct and Statement-II is correct
Description : Hydrogen sulphide cannot be dried by passing through conc. `H_(2)SO_(4)` . Why ?
Last Answer : Hydrogen sulphide cannot be dried by passing through conc. `H_(2)SO_(4)` . Why ? A. The acid ... C. Both form complex D. It dissovles in the acid
Description : Assertion :- Oxidation state of Hydrogen is `+1` in `H_(2)O` while `-1` in `CaH_(2)`. Reason :- `CaH_(2)` is a metal hydride and for metal hydrides, h
Last Answer : Assertion :- Oxidation state of Hydrogen is `+1` in `H_(2)O` while `-1` in `CaH_(2)`. ... Reason is False. D. If both Assertion & Reason are False.
Description : Compound (A), `C_(10)H_(12)O` gives off hydrogen on treatment with sodium metal and decolourises `Br_(2)` in `C Cl_(4)` to give (B), `C_(10)H_(12)OBr`
Last Answer : Compound (A), `C_(10)H_(12)O` gives off hydrogen on treatment with sodium metal and ... pairs of diasteereomers D. A has 2 chiral centres
Description : A compound X of the formula `C_(2)H_(6)O` on reaction with Na metal gave Y, X also reacts with `PC1_(5)` to give Z the product obtained in the reactio
Last Answer : A compound X of the formula `C_(2)H_(6)O` on reaction with Na metal gave Y, X also reacts with `PC1_(5)` to ... )H_(5)` D. `C_(2)H_(5)OC_(2)H_(5)`
Description : When equal weight of methyl alcohol and ehtyl alcohol react with excess of sodium metal, the volume of `H_(2)` liberated is more in the case of
Last Answer : When equal weight of methyl alcohol and ehtyl alcohol react with excess of sodium metal, the volume of `H_(2 ... in both D. `H_(2)` is not liberated
Description : Two organic compound A and B react with sodium metal and release `H_(2)` gas. A and B react with each other to give ethyl acetate. The A and B are
Last Answer : Two organic compound A and B react with sodium metal and release `H_(2)` gas. A and B react with each other ... (3)OH` D. `CH_(3)COOH " and " HCOOH`
Description : Events like earthquake, volcanic eruption, tsunamis etc., cannot be prevented but their effects can be reduced.
Last Answer : Identify the correct correlation: A - Events like earthquake, volcanic eruption, tsunamis etc., cannot be ... R is not the correct explanation of A.
Description : i am selfemployed and i owe taxes for 2005 and 2006 i cannot pay them because of back and knee apoerations and filed for disability and the keep adding on penality and interest can you help me get them reduced?
Last Answer : first locate a disability and tax advisor or tax lawyer.they will be able to tell you and advise you ways the IRS wont
Description : During the manufacture of sulphuric acid, the temperature of molten sulphur is not increased beyond 160°C, as (A) It is very corrosive at elevated temperature (B) Its viscosity is not reduced on ... be further reduced) (C) It decomposes on further increasing the temperature (D) None of these
Last Answer : (B) Its viscosity is not reduced on further heating (hence pressure drop on pumping it, cannot be further reduced)
Description : Energy monitoring and targeting is built on the principle of ― ‖. a)production can be reduced to achieve reduced energy consumption‖ b)Consumption of energy is proportional to production rate‖ c)You cannot manage what you do not measure‖ d)None of the above
Last Answer : You cannot manage what you do not measure‖
Description : Energy monitoring and targeting is built on the principle of ― _____‖ a) ―production can be reduced to achieve reduced energy consumption‖ b) ―Consumption of energy is proportional to production rate‖ c) ―You cannot manage what you do not measure‖ d) None of the above.
Last Answer : You cannot manage what you do not measure