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

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?

The one that is NOT suitable for the removal of permanent hardness of water is ______.

The equation that represent general van't Hoff equation is ______.

An element having electronic configuration 1s² 2s² 2p⁶ 3s² 3p⁶ 4s¹ forms ______.

High concentration of which of the following in the atmosphere leads to stiffness of flower buds which eventually fall off from plants?

Mark the oxide which is amphoteric in character.

Identify the invalid equation.

For which among the following equimolar aqueous solutions Van't Hoff factor has the lowest value?

\[\ce{A -> B}\], ∆H = −10 kJ mol⁻¹, E_a(f) = 50 kJ mol⁻¹, then E_a of \[\ce{B -> A}\] will be ______.

What is the amount of water formed by the combustion of 1.6 g methane?

Identify the element that forms amphoteric oxide.

What is the energy associated with first orbit of Li²⁺ (R_H = 2.18 × 10^-18)?

In hydrogen atom, transition from the state n = 6 to n = 1 results in ultraviolet radiation. Infrared radiation will be obtained in the transition ______.