Description : Asseration: The thermal stability of hydrides of oxygen family decrease with molecular weight. Reason: The decomposition of `M-H` bond requires lesser
Last Answer : Asseration: The thermal stability of hydrides of oxygen family decrease with molecular weight. Reason: The decomposition ... in `O-H` than `S-H`.
Description : The statements regarding hydrides of VIA group elements are i) The order of volatility `H_(2)OltH_(2)TeltH_(2)SeltH_(2)S` ii) The order of B.P `H_(2)O
Last Answer : The statements regarding hydrides of VIA group elements are i) The order of volatility `H_(2)OltH_(2)TeltH_ ... are correct D. `i` & iii are correct
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 : The maximum bond angle in hydrides of group 16 elements is in
Last Answer : The maximum bond angle in hydrides of group 16 elements is in A. `H_(2)O` B. `H_(2)Se` C. `H_(2)S` D. `H_(2)Te`
Description : The correct statements(s) regarding hydrides `(H_(2)E)` of group -16 is/are
Last Answer : The correct statements(s) regarding hydrides `(H_(2)E)` of group -16 is/are A. The ... D. The reducing character of hydrides increases down the group
Description : Bond dissociation enthalpy of `H_(2)` , `Cl_(2)` and `HCl` are `434, 242` and `431KJmol^(-1)` respectively. Enthalpy of formation of `HCl` is
Last Answer : Bond dissociation enthalpy of `H_(2)` , `Cl_(2)` and `HCl` are `434, 242` and `431KJmol^(-1)` respectively. ... kJ mol^(-1)` D. `-245 kJ mol^(-1)`
Description : The decreasing order of bond dissociation energy of C-H bond in given compound is :- (A) `CH_(3)-H` (B) `CH_(3)-CH_(2)-H` `CH_(2)=CH-CH_(2)-H` (D)
Last Answer : The decreasing order of bond dissociation energy of C-H bond in given compound is :- (A) `CH_(3)-H` (B) `CH_(3)- ... gt B gt A` D. `C gt B gt A gt D`
Description : Which of the following compounds prossesses the `C-H` bonds with the lowest bond dissociation energy?
Last Answer : Which of the following compounds prossesses the `C-H` bonds with the lowest bond dissociation energy? ... B. n-pentane C. Benzene D. Toluene
Last Answer : Which of the following compounds prossesses the `C-H` bonds with the lowest bond dissociation energy? ... n-Pentane C. Toluene D. 2,2-Dimethylpropane
Description : The stability of the halides of group 16 elements decreases in the order
Last Answer : The stability of the halides of group 16 elements decreases in the order A. `F gt Cl gt Br gt I` B. `Cl gt Br ... gt Cl gt F` D. `Br gt Cl gt F gt I`
Description : The basic strength of the hydrides of group 15 elements :
Last Answer : The basic strength of the hydrides of group 15 elements : A. decreases on moving down the group ... first increases upto `AsH_(3)` and then decreases
Description : Assertion `:-` In the tissue high `P_(O_(2))`, low `P_(CO_(2))`, higher `H^(o+)` concentration conditions are favourable for dissociation of oxygen fr
Last Answer : Assertion `:-` In the tissue high `P_(O_(2))`, low `P_(CO_(2))`, higher `H^(o+)` ... Reason is False. D. If both Assertion & Reason are false.
Description : Arrange the carbanions, `(CH_(3))_(3)bar(C),bar(C)Cl_(3),(CH_(3))_(2)bar(C)H,C_(6)H_(5)bar(C)H_(2)`, in order of their decreasing stability
Last Answer : Arrange the carbanions, `(CH_(3))_(3)bar(C),bar(C)Cl_(3),(CH_(3))_(2)bar(C)H,C_(6)H_(5)bar(C)H_(2 ... (2)bar(C)HgtC_(6)H_(5)bar(C)H_(2)gtbar(C)Cl_(3)`
Description : Arrange the following carbanions in decreasing orde of stability: `HC-=bar(C)(I)," "H_(3)C-C-=bar(C)(II),` `H_(2)C=bar(C)H(III)," "H_(3)C-bar(C)H_(2)(
Last Answer : Arrange the following carbanions in decreasing orde of stability: `HC-=bar(C)(I)," "H_(3 ... `IIgtIgtIIIgtIV` C. `IVgtIIIgtIIgtI` D. `IgtIIgtIIIgtIV`
Description : With increasing bond order, stability of a bond (a) Decreases (b) Increases (c) Remains unchanged (d) None of these
Last Answer : Ans:(b)
Description : In the redox reaction . `MnO_(4)^(-)+C^(2)O_(4)^(2-)+H^(+) rarr Mn^(2+)+CO_(2)+H_(2)O` (Unbalance equation) 20 mL of 0.1 M `KMnO_(4)` react quantitive
Last Answer : In the redox reaction . `MnO_(4)^(-)+C^(2)O_(4)^(2-)+H^(+) rarr Mn^(2+)+CO_(2)+H_(2)O` ( ... . 40 mL of 0.1 M oxalate D. 50 mL of 0.25 M oxalate
Description : How is the stability of a co-ordination compound in solution decided ? How is the dissociation constant of a complex defined? -Chemistry
Last Answer : Stability of a complex in solution means the measure of resistance to the replacement of a ligand by some other ligand. This stablility can be expressed in terms of equilibrium constant. Let the ... is its tendency to donate electron pair and therefore, more is the stability of the complex.
Description : The correct order of the thermal stability of hydrogen halides `(H-X)` is
Last Answer : The correct order of the thermal stability of hydrogen halides `(H-X)` is A. (1) HI gt HBrgt HCI gt HF B. ... HBr lt HI D. (4)Hl gt HCI lt HF lt HBr
Description : If a point O lies between two points P and R such that PO=OR then prove that PO= 1/2PR. -Maths 9th
Last Answer : THINGS WHICH ARE COINCIDE WITH EACH OTHER ARE EQUAL TO ONE ANOTHER PO+OR=PR 2PO=PR PO=OR PO=1/2PR HENCE PROVED
Description : An ideal air standard Otto cycle has a compression ratio of 8.5. If the ratio of the specific heats is 1.4, then what is thermal efficiency (in percentage) of the Otto cycle? a. 57.5% b. 45.7% c. 52.5% d. 95%
Last Answer : ANSWER a. 57.5%
Description : Assign the reason for the following: (a) Enthalpy of fusion of water is higher as compared to the hydrides of Sulphur & Selenium. (b) Water is quite stable and does not dissociate in to its elements even at high temperature.
Last Answer : Ans-a) Due hydrogen bond it has high latent heat of fusion b) Water is a stable compound and its decomposition is not thermodynamically feasible
Description : The correct order of O - O bond length in `O_(2)H_(2)O_(2)` and `O_(3)` is
Last Answer : The correct order of O - O bond length in `O_(2)H_(2)O_(2)` and `O_(3)` is A. `O_(2)gtO_(3)gtH_(2)O_( ... )O_(2)gtO_(2)` D. `H_(2)O_(2)gtO_(3)gtO_(2)`
Description : Give reason for the following observation (L-III) (a)- The tendency for catenation decreases down the group in group 14 (b)- The decreasing stability of+3 oxidation state with increasing atomic no. in group 13. (c)- Molten aluminum bromide is a poor conductor of electricity.
Last Answer : Ans. -(a) it is due to decrease in bond dissociation energy which is due to increase in atomic size C-C > Si-Si >Ge-Ge>Sn-Sn>Pb-Pb. (b)- It is due to inert pair effect. (c)- Molten AlBr3 is poor conductor of electricity because it is covalent compound.
Description : Assertion :- Bond Dissociation energy is `F_(2) gt Cl_(2)` Reason:- `Cl_(2)` have more electronic repulsion than `F_(2)`.
Last Answer : Assertion :- Bond Dissociation energy is `F_(2) gt Cl_(2)` Reason:- `Cl_(2)` have more ... is False. D. If both Assertion & Reason are false
Description : With respect to halogens, four statements are given below: (P) The bond dissociation energies for halogens are in the order: `I_(2) lt F_(2) lt Br_(2)
Last Answer : With respect to halogens, four statements are given below: (P) The bond dissociation energies for halogens are in ... ,III,IV C. II,III,IV D. I,III
Description : The X - X bond dissociation energy is minimum in:
Last Answer : The X - X bond dissociation energy is minimum in: A. (A) `F_2` B. (B) `Cl_2` C. (C) `Br_2` D. (D)`l_2`
Description : The correct order in which oxygen - oxygen bond dissociation energy increases is:
Last Answer : The correct order in which oxygen - oxygen bond dissociation energy increases is: A. `H_(2)O_(2)ltO_(2)ltO_(3)` ... 2)` D. `O_(2)ltH_(2)O_(2)ltO_(3)`
Description : Ionisation energy of nitrogen is greater than that of oxygen because nitrogen has – (1) high bond dissociation energy (2) smaller atomic radius (3) stable half filled 2p sub level (4) high nuclear charge
Last Answer : (3) stable half filled 2p sub level Explanation: Ionization energy is a measure of the ease in which atoms lose electrons and become positive ions.
Description : Define Bond length& Bond dissociation enthalpy
Last Answer : Ans. The equilibrium distance between the centre s of the nuclei of two bonded atoms is called bond length. The energy required to break a bond is called bond dissociation enthalpy.
Description : Which describes the bond strength or bond dissociation energy? (a) energy required to break a bond (b) energy released when a bond breaks (c) energy released when a bond is formed (d) (a) and (c)
Last Answer : (a) and (c)
Description : Ionisation energy of nitrogen is greater than that of oxygen because nitrogen has (1) high bond dissociation energy (2) smaller atomic radius (3) stable half filled 2p sub level (4) high nuclear charge
Last Answer : stable half filled 2p sub level
Description : Which of the following is an endothermic reaction? (A) Absorption of SO3 in 98% H2SO4 (B) C + H2O = CO + H2 (C) Thermal dissociation of iron pyrites (D) Both (B) and (C)
Last Answer : (D) Both (B) and (C)
Description : Titanium is produced by __________ of Ti Cl4. (A) Electrolytic reduction (B) Calcium reduction (C) Magnesium reduction (D) Thermal dissociation
Last Answer : (C) Magnesium reduction
Description : For perfect gas a. cp – cv = R b. cp + cv = R c. cp / cv = R d. cp X cv = R Where cp & cv are specific heats at constant pressure and volume.
Last Answer : ANSWER a. CP – CV = R
Description : The gas constant (R) is equal to the __________ of two specific heats. A. sum B. difference C. product D. ratio
Last Answer : Answer: B
Description : The two specific heats of gases are related by : (1) Cp + Cv = RJ (2) Cp –Cv = R/J (3) Cp – Cv = RJ (4) Cp /Cv = R
Last Answer : Cp –Cv = R/J
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 : Using the following thermochemical data. `C(S)+O_(2)(g)rarr CO_(2)(g), Delta H=94.0` Kcal `H_(2)(g)+1//2O_(2)(g)rarr H_(2)O(l), Delta H=-68.0` Kcal `C
Last Answer : Using the following thermochemical data. `C(S)+O_(2)(g)rarr CO_(2)(g), Delta H=94.0` Kcal `H_(2)(g)+1// ... .0` Kcal C. `-114.0` Kcal D. `+114.0` Kcal
Description : Given that - `2C(s)+2O_(2)(g)rarr 2CO_(2)(g) Delta H = -787 KJ` `H_(2)(g)+ 1//2O_(2)(g)rarr H_(2)O(l) Delta =-286 KJ` `C_(2)H_(2)(g)+(5)/(2)O_(2)(g)ra
Last Answer : Given that - `2C(s)+2O_(2)(g)rarr 2CO_(2)(g) Delta H = -787 KJ` `H_(2)(g)+ 1//2O_(2)(g)rarr H_(2) ... 1802` KJ B. `-1802` KJ C. `-800` KJ D. `+237` KJ
Description : The enthalpy changes at 298 K in successive breaking of `O-H` bonds of water, are `H_(2)O(g) rarr H(g)+OH(g),DeltaH=498kJ mol^(-1)` `OH(g) rarr H(g)+O
Last Answer : The enthalpy changes at 298 K in successive breaking of `O-H` bonds of water, are `H_(2)O(g) rarr H(g)+OH(g), ... KJ mol"^(-1)` D. `463 "KJ mol"^(-1)`
Description : If `H^(+)+OH^(-)rarrH_(2)O+13.7Kcal` , the heat of neutralisation for complete neutralisation of 1 mole of `H_(2)SO_(4)` by base will be
Last Answer : If `H^(+)+OH^(-)rarrH_(2)O+13.7Kcal` , the heat of neutralisation for complete neutralisation of 1 mole of ... . 27.4 Kcal C. 6.85 Kcal D. 3.425 Kcal
Description : For the redox reation `MnO_(4)^(-)+C_(2)O_(4)^(2-)+H^(+)rarrMn^(2+)CO_(2)+H_(2)O` The correct stoichiometric coefficients of `Mno_(4)^(-),C_(2)O_(4)^(
Last Answer : For the redox reation `MnO_(4)^(-)+C_(2)O_(4)^(2-)+H^(+)rarrMn^(2+)CO_(2)+H_(2)O` The correct stoichiometric ... . 16, 5, 2 C. 2, 16, 5 D. 5, 2, 16
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 : In the balanced equation `MnO_(4)^(-)+H^(+)+C_(2)O_(4)^(2-)rarr Mn^(2+)+CO_(2)+H_(2)O`, the moles of `CO_(2)` formed are :-
Last Answer : In the balanced equation `MnO_(4)^(-)+H^(+)+C_(2)O_(4)^(2-)rarr Mn^(2+)+CO_(2)+H_(2)O`, the moles of `CO_(2)` formed are :- A. 2 B. 4 C. 5 D. 10
Description : In the reaction `MnO_(4)^(-)+SO_(3)^(-2)+H^(+)rarrSO_(4)^(-2)+Mn^(2+)+H_(2)O`
Last Answer : In the reaction `MnO_(4)^(-)+SO_(3)^(-2)+H^(+)rarrSO_(4)^(-2)+Mn^(2+)+H_(2)O` A. `MnO_(4)^( ... `MnO_(4)^(-)` is oxidised and `SO_(3)^(2-)` is reduced
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 : `Ph-CH=CH-underset(O)underset(C)-H overset((i) CH_(3)CH_(2)MgBr)to overset((ii) H_(3)O^(o+))to(X) overset(Cu,Delta)to(Y)`
Last Answer : `Ph-CH=CH-underset(O)underset(C)-H overset((i) CH_(3)CH_(2)MgBr)to overset((ii) H_(3)O^(o+))to(X) ... -underset(O)underset(||)(C)-CH=CH-CH_(2)-CH_(3)`