Mole Concept & Stoichiometry · JEE Main previous year questions

2004 3 questions

1. Q1472004 · 24 Apr 2004 · Shift 1

   $6.02\times 10^{20}$ molecules of urea are present in 100 ml of its solution. The concentration of urea solution is (Avogadro constant, $N_A=6.02\times 10^{23}\mathrm{mo}{\mathrm{l}}^{-1}$)

   1. A.0.02 M
   2. B.0.01 M
   3. C.0.001 M
   4. D.0.1 M
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   Answer: B

2. Q1632004 · 24 Apr 2004 · Shift 1

   The enthalpies of combustion of carbon and carbon monoxide are -393.5 and -283 $\mathrm{kJ}\mathrm{mo}{\mathrm{l}}^{-1}$ respectively. The enthalpy of formation of carbon monoxide per mole is :

   1. A.110.5 kJ
   2. B.-110.5 kJ
   3. C.-676.5 kJ
   4. D.676.5 kJ
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   Answer: B

3. Q2152004 · 24 Apr 2004 · Shift 1

   One mole of magnesium nitride on the reaction with an excess of water gives :

   1. A.one mole of ammonia
   2. B.two moles of nitric acid
   3. C.two moles of ammonia
   4. D.one mole of nitric acid
   Show answer

   Answer: C