MAH-MHT CET (PCM/PCB) entrance exam Question Bank Solutions

In resonance hybrid of ozone molecule, O-O bond length is ____________.

Which among the following oxides is amphoteric in nature?

What is the colour of gaseous ozone?

Van't Hoff factor for K₃[Fe(CN)₆] is 3.333. What is it's percentage dissociation in water?

Why is observed molar mass of acetic acid in benzene is greater than actual molar mass?

Standard enthalpy of formation of water is - 286 kJ mol^-1. When 1800 mg of water is formed from its constituent elements in their standard states the amount of energy liberated is ______.

Given that,

\[\ce{C_{(s)} + O_{2(g)} -> CO_{2(g)}}\]   ΔH° = -X kJ

\[\ce{2CO_{(g)} + O_{2(g)} -> 2CO_{2(g)}}\]   ΔH° = - Y kJ, then standard enthalpy of formation of carbon monoxide is ________.

Which of the following equations is NOT correct for van't Hoff factor?

An ideal gas expands isothermally and reversibly from 10 m³ to 20 m³ at 300 K performing 5 .187 kJ of work on surrounding. Calculate number of moles of gas undergoing expansion. (R = 8.314 J K^-1 mol^-1)

Heat of formation of water is - 272 kJ mol^-1. What quantity of water is converted to H₂ and O₂ by 750 kJ of heat?

Standard entropies of N_2(g), H_2(g), and NH_3(g) are a₁, a₂ and a₃ J K^-1 mol^-1 respectively. What is value of ΔS° for formation of NH_3(g)?

Which of following 0.1 m aqueous solution exhibits highest osmotic pressure at 25°C?

Solution of 'A' containing 1.73 g of it in 100 cm³ of water is found to be isotonic with a 3.42% (w/v) solution of sucrose. The molecular weight of A is ______. (At. mass C = 12, H = 1, 0 = 16)

Van't Hoff factor (i) for centimolal solution of \[\ce{K3[Fe(CN)6]}\] is 3.333. What is its percentage dissociation?

Which of the following equations has Δ_fH° and ΔH° same?

Heat of formation of ethane, ethylene acetylene and carbon dioxide are - 136, - 66, - 228 and - 395 (all in kJ) respectively, most stable among them is ______.

Which of the following is not an assumption of the kinetic theory of gases?

From the following bond energies:

H – H bond energy: 431.37 kJ mol⁻¹

C = C bond energy: 606.10 kJ mol⁻¹

C – C bond energy: 336.49 kJ mol⁻¹

C – H bond energy: 410.50 kJ mol⁻¹

Enthalpy for the given reaction will be:

\[\begin{array}{cc}
\phantom{}\ce{H}\phantom{...}\ce{H}\phantom{...................}\ce{H}\phantom{...}\ce{H}\phantom{....}\\
\phantom{.}|\phantom{....}|\phantom{....................}|\phantom{....}|\phantom{.....}\\
\ce{C = C + H - H -> H - C - C - H}\\
\phantom{.}|\phantom{....}|\phantom{....................}|\phantom{....}|\phantom{.....}\\
\phantom{}\ce{H}\phantom{...}\ce{H}\phantom{...................}\ce{H}\phantom{...}\ce{H}\phantom{....}
\end{array}\]

Which of the following statements regarding fuel cell is incorrect?

Which one is amphoteric oxide?