One mole of ethanol is produced reacting graphite, H2 and O2 together. The standard enthalpy of formation is - text277 text.7 textkJ textmol- text1 . Calculate the standard enthalpy of the reaction when 4 moles of graphite is involved.

Questions from NTA Abhyas 2022

1. An alkene on ozonolysis gives a mixture of two carbonyl compounds. Mixture on Clemmensen reduction gives just one alkane . is the lowest alkane which in pure form can not be prepared by standard Wurtz method. is

2. A cation is in the centre touches three anions. Assume that the anions also touch each other. The limiting radius ratio, is

3. Blue colour of alkali and alkaline earth metals in liquid is due to

4. Which of the following oxides is strongly basic?

5. In a box hydroiodic acid is taken. After equilibrium the concentration of is found to be . The concentration of at equilibrium in , is

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1. If for a certain reaction is at , the value of (in for which the same reaction will be spontaneous at the same temperature is

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2. If of a non-electrolyte solute is dissolved in of n-octane to reduce its vapour pressure to , the molar mass (in of the solute is [Given that molar mass of n-octane is

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3. An organic compound contains (by wt.) carbon and remaining percentage of hydrogen. The right option for the empirical formula of this compound is: [Atomic wt. of is is ]

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4. At standard conditions, if the change in the enthalpy for the following reaction is Given that bond energy of and is and , respectively, what is the bond energy (in of ?

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5. The density of 2 M aqueous solution of NaOH is 1.28 g/cm. The molality of the solution is
[Given that molecular mass of NaOH = 40 g mol]

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