Recent questions and answers in 2017

Which of the following reactions is appropriate for converting acetamide to methanamine ?

answered Mar 27, 2020 by meena.clay6

1 answer

The species, having bond angles of $120^o$ is

answered Mar 27, 2020 by meena.clay6

1 answer

If molality of the dilute solution is doubled, the value of molal depression constant $(K_f)$ will be

answered Mar 27, 2020 by meena.clay6

1 answer

Which one is the correct order of acidity ?

answered Mar 27, 2020 by meena.clay6

1 answer

The element Z = 114 has been discovered recently. It will belong to which of the following family/group and electronic configuration ?

answered Mar 27, 2020 by meena.clay6

2 answers

Ionic mobility of which of the following alkali metal ions is lowest when aqueous solutions of their salts are put under an electric filed?

answered Mar 27, 2020 by meena.clay6

1 answer

Which one of the following statements is not correct ?

answered Mar 27, 2020 by meena.clay6

1 answer

$HgCl_2$ and $I_2$ both when dissolved in water containing $I^–$ ions pair of species formed is :

answered Mar 27, 2020 by meena.clay6

1 answer

Which of the following pairs of compounds is isoelectronic and isostructural ?

answered Mar 27, 2020 by meena.clay6

1 answer

For a given reaction, $\Delta H = 35.5\; KJ\; mol^{-1}$ and $\Delta S = 83.6 \; JK^{-1} mol^{-1}$. The reaction is spontaneous at : (Assume that $\Delta H$ and $\Delta S$ do not vary with temperature)

answered Mar 27, 2020 by meena.clay6

1 answer

Correct increasing order for the wavelengths of absorption in the visible region for the complexes of $Co^{3+}$ is -

answered Mar 27, 2020 by meena.clay6

1 answer

A gas is allowed to expand in a well insulated container against a constant external pressure of 2.5 atm from an initial volume of 2.50 L to a final volume of 4.50 L. The change in internal energy $\Delta U$ of the gas in joules will be -

answered Mar 27, 2020 by meena.clay6

1 answer

In the electrochemical cell - $Zn|ZnSO_4 \; (0.01 M) || CuSO_4 \; (1.0 M) | Cu$, the emf of this Daniel cell is $E_1$. When the concentration of $ZnSO_4$ is changed to $0.1 M$ and that of $CuSO_4$ changed to $0.01 M$, the emf changes to $E_2$. From the followings, which one is the relayionship between $E_1$ and $E_2$ ? (Given , $\frac{RT}{F} = 0.059$)

answered Mar 27, 2020 by meena.clay6

1 answer

Predict the correct intermediate and product in the following reaction : $H_3C - CH \equiv CH \xrightarrow[\text{$HgSO_4$}]{\text{$H_2O, H_2SO_4$}} \stackrel{\hbox{Intermediate}}{\hbox{(A)}} \to \stackrel{\hbox{Product}}{\hbox{(B)}}$

answered Mar 26, 2020 by meena.clay6

2 answers

Machanism of a hypothetical reaction $X_2 + Y_2 \to 2XY$ is given below. (i) $X_2 \to X + X (fast)$ (ii) $X + Y_2 \rightleftharpoons XY + Y (slow)$ (iii) $X + Y \to XY (fast) $ The overall order of the reaction will be -

answered Mar 26, 2020 by meena.clay6

1 answer

Consider the reactions : Identify A, X, Y and Z

answered Mar 26, 2020 by meena.clay6

1 answer

A first order reaction has a specific reaction rate of $10^{–2} sec^{–1}$. How much time will it take for $20 \;g$ of the reactant to reduce to $5g$ ?

answered Mar 26, 2020 by meena.clay6

1 answer

Which one is the most acidic compound ?

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1 answer

Which one is the wrong statement ?

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1 answer

An example of a sigma bonded organometallic compound is-

answered Mar 26, 2020 by meena.clay6

1 answer

The correct order of the stoichiometries of $AgCl$ formed when $AgNO_3$ in excess is treated with the complexes : $CoCl_3.6NH_3, CoCl_3.5NH_3, CoCl_3.4NH_3$ respectively is -

answered Mar 26, 2020 by meena.clay6

1 answer

Which of the following is dependent on temperature ?

answered Mar 26, 2020 by meena.clay6

1 answer

Which is the incorrect statement ?

answered Mar 26, 2020 by meena.clay6

1 answer

A 20 litre container at 400 K contains $CO_2(g)$ at pressure $0.4\; atm$ and an excess of $SrO$ (neglect the volume of solid $SrO$). The volume of the container is now decreased by moving the movable piston fitted in the container. The maximum volume of the container, when pressure of $CO_2$ attains its maximum value, will be : (Given that : $SrCO_3 (s) \stackrel{K}\rightleftharpoons SrO (s) + CO_2 (g), Kp = 1.6 \; atm$ )

answered Mar 26, 2020 by meena.clay6

1 answer

Extraction of gold and silver involves leaching with $CN^–$ ion. Silver is later recovered by :

answered Mar 26, 2020 by meena.clay6

1 answer