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Chemistry-

General

Easy

Question

ΔHfC2H4=12.5KcalHeatofatomisationofC=171kcal Heat of atomisation of H=52.1kcal Bond energy C–H=99.3kcal
What is C=C bond energy?

140.7Kcal
36Kcal
40Kcal
76Kcal

The correct answer is: 140.7Kcal

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Inthereactions HCl+NaOH→NaCl+H2O+xcal H2SO4+2NaOH→Na2SO4+2H2O+ycal

Inthereactions HCl+NaOH→NaCl+H2O+xcal H2SO4+2NaOH→Na2SO4+2H2O+ycal

chemistry-General

IftheheatofformatioofNO2is‘x’[1/2N2(g)+O2(g)→NO2(g)]theheatofreactionN2(g)+O2(g) →2NO(g)isyandtheheatofreaction2NO(g)+O2(g)→2NO2(g) is z then

IftheheatofformatioofNO2is‘x’[1/2N2(g)+O2(g)→NO2(g)]theheatofreactionN2(g)+O2(g) →2NO(g)isyandtheheatofreaction2NO(g)+O2(g)→2NO2(g) is z then

chemistry-General

Which of the following process involves decrease in the entropy of system–

Which of the following process involves decrease in the entropy of system–

chemistry-General

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A galvanometer, having a resistance of $50 subscript straight capital omega comma$ gives a fall scale deflection for a current of 0.05 A The length in metre of a resistance wire of are of cross-section 2.97 $cross times 10 to the power of negative 2 space end exponent c m to the power of negative 2 end exponent$ that can be used to convertt the galvanometer into an ammeter which can read a maximum of 5 A current is (specific resistance of wire= $5 cross times 10 to the power of negative 7 end exponent$ Ωm )

A galvanometer, having a resistance of $50 subscript straight capital omega comma$ gives a fall scale deflection for a current of 0.05 A The length in metre of a resistance wire of are of cross-section 2.97 $cross times 10 to the power of negative 2 space end exponent c m to the power of negative 2 end exponent$ that can be used to convertt the galvanometer into an ammeter which can read a maximum of 5 A current is (specific resistance of wire= $5 cross times 10 to the power of negative 7 end exponent$ Ωm )

Ahypothetical reaction , A→2B, proceed throughfollowingsequenceofsteps- A→C;ΔH=q1
C→D;ΔH=q2
$fraction numerator 1 over denominator 2 end fraction D rightwards arrow B semicolon capital delta H equals q subscript 3 end subscript$ Theheatofreactionis:

Ahypothetical reaction , A→2B, proceed throughfollowingsequenceofsteps- A→C;ΔH=q1
C→D;ΔH=q2
$fraction numerator 1 over denominator 2 end fraction D rightwards arrow B semicolon capital delta H equals q subscript 3 end subscript$ Theheatofreactionis:

chemistry-General

Theenthalpyofvapourisationofliquidwaterusing thedata :
H2(g)+½O2(g)→H2O( $ell$ );ΔH=–285.77KJmol–1
H2(g)+½O2(g)→H2O(g);ΔH=–241.84KJmol–1

Theenthalpyofvapourisationofliquidwaterusing thedata :
H2(g)+½O2(g)→H2O( $ell$ );ΔH=–285.77KJmol–1
H2(g)+½O2(g)→H2O(g);ΔH=–241.84KJmol–1

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The heat of reaction for A+ 2O²→AOis-50Kcal and AO+2O²→AO2 is100Kcal.The heat of reaction

The heat of reaction for A+ 2O²→AOis-50Kcal and AO+2O²→AO2 is100Kcal.The heat of reaction

chemistry-General

Findtheheatchangein thereaction NH3(g)+HCl(g)ΔNH4Cl(s) fromthefollowingdata
NH3(g)+aq→NH3(aq),ΔH=–8.4K.Cal
HCl(g)+aq→HCl(aq),ΔH=–17.3KCal
NH3(aq)+HCl(aq)→NH4Cl(aq),ΔH=–12.5KCal
NH4Cl(S)+aq→NH4Cl(aq),ΔH=+3.9K.Cal

Findtheheatchangein thereaction NH3(g)+HCl(g)ΔNH4Cl(s) fromthefollowingdata
NH3(g)+aq→NH3(aq),ΔH=–8.4K.Cal
HCl(g)+aq→HCl(aq),ΔH=–17.3KCal
NH3(aq)+HCl(aq)→NH4Cl(aq),ΔH=–12.5KCal
NH4Cl(S)+aq→NH4Cl(aq),ΔH=+3.9K.Cal

chemistry-General

Given that:
2C(s)+2O2(g)→2CO2(g)ΔH=–787KJ
H2(g)+½O2(g)→H2O( $ell$ )ΔH=–286KJ
C2H2(g)+2O2(g)→2CO2(g)+H2O( $ell$ )ΔH=–1310
Heat of formation of acetylene is-

Given that:
2C(s)+2O2(g)→2CO2(g)ΔH=–787KJ
H2(g)+½O2(g)→H2O( $ell$ )ΔH=–286KJ
C2H2(g)+2O2(g)→2CO2(g)+H2O( $ell$ )ΔH=–1310
Heat of formation of acetylene is-

chemistry-General

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Giventhat-Zn+½O2→ZnO+84000cal..........1 Hg++O →HgO+21700cal.........2 The heat of reaction (ΔH) for, Zn+HgO→ ZnO+Hg is-

Giventhat-Zn+½O2→ZnO+84000cal..........1 Hg++O →HgO+21700cal.........2 The heat of reaction (ΔH) for, Zn+HgO→ ZnO+Hg is-

chemistry-General

A galvanometer of resistance 200Ω gives full scale deflection with 15 milli-aupere current In order to convert it into a 15 V range voltmeter What is the value of resistance connected in series?

A galvanometer of resistance 200Ω gives full scale deflection with 15 milli-aupere current In order to convert it into a 15 V range voltmeter What is the value of resistance connected in series?

The save of a galvanometer of resistance 100Ω contains 25 divisions It gives a deflection of 1 division on passing a current of $4 cross times 10 to the power of negative 4 end exponent$ A The resistance in ohm to be added to it so that it may become a voltmeter of range 25 V is

The save of a galvanometer of resistance 100Ω contains 25 divisions It gives a deflection of 1 division on passing a current of $4 cross times 10 to the power of negative 4 end exponent$ A The resistance in ohm to be added to it so that it may become a voltmeter of range 25 V is

parallel

IfH2(g)+Cl2(g)→2HCl(g);ΔH°=–44Kcal 2Na(s)+2HCl(g)→2NaCl(s)+H2(g);ΔH=–152KcalThe,Na(s)+0.5Cl(g)→NaCl(s);ΔH°=?

IfH2(g)+Cl2(g)→2HCl(g);ΔH°=–44Kcal 2Na(s)+2HCl(g)→2NaCl(s)+H2(g);ΔH=–152KcalThe,Na(s)+0.5Cl(g)→NaCl(s);ΔH°=?

chemistry-General

Fromthefollowingdata,theheatofformationof Ca(OH)2(s) at18°Cis......Kcal.
i)CaO(s)+HO( $ell$ )=Ca(OH)(s);ΔH18°C=–15.26Kcal....
ii)H2O( $ell$ )=H2(g)+1/2O2(g)ΔH18°C=68.37Kcal......
iii)Ca(s)+1/2O2(g)=CaO(s)ΔH18°C=–151.80Kcal...

Fromthefollowingdata,theheatofformationof Ca(OH)2(s) at18°Cis......Kcal.
i)CaO(s)+HO( $ell$ )=Ca(OH)(s);ΔH18°C=–15.26Kcal....
ii)H2O( $ell$ )=H2(g)+1/2O2(g)ΔH18°C=68.37Kcal......
iii)Ca(s)+1/2O2(g)=CaO(s)ΔH18°C=–151.80Kcal...

chemistry-General

Given that: A(s)→A( $ell$ );ΔH=x, A( $ell$ )→A(g)–y The heat of sublimation of A will be-

Given that: A(s)→A( $ell$ );ΔH=x, A( $ell$ )→A(g)–y The heat of sublimation of A will be-

chemistry-General

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