List of practice Questions

S $ \equiv x^2 + y^2 - 2x - 4y - 4 = 0 $ and $ S' \equiv x^2 + y^2 - 4x - 2y - 16 = 0 $ are two circles. The point $ (-2, -1) $ lies
For a cell reaction, $ A(s) + B^{2+}(aq) \rightarrow A^{2+}(aq) + B(s) $; the standard emf of the cell is 0.295 V at 25°C. The equilibrium constant at 25°C will be
Which of the following shows negative deviation from Raoult's law?
5 g of non-volatile water soluble compound X is dissolved in 100 g of water. The elevation in boiling point is found to be 0.25. The molecular mass of compound X is
The correct decreasing order of negative electron gain enthalpy for C, Ca, Al, F and O is

I and II are

Ti$^2+$ is purple while Ti$^4+$ is colourless because
In Friedel-Crafts alkylation reaction of phenol with chloromethane, the product formed will be
Which among the following is diamagnetic?
Which one of the following is an important component of chlorophyll?
A volatile compound is formed by carbon monoxide and
The complex $ [PtCl_2(en)_2]^{2+} $ ion shows
15 g of $ \text{CaCO}_3 $ completely reacts with
Bohr's radius of 2nd orbit of $ \text{Be}^{3+} $ is equal to that of
How much faster would a reaction proceed at $ 25^\circ C $ than at $ 0^\circ C $ if the activation energy is 65 kJ?
The blue colouration obtained from the Lassaigne's test of nitrogen is due to the formation of
The ion that is isoelectronic with CO is
At 300 K, the half-life period of a gaseous reaction at an initial pressure of 40 kPa is 350 s. When pressure is 20 kPa, the half-life period is 175 s. What is the order of the reaction?
If 2 moles of $ C_6H_6 $ (g) are completely burnt 4100 kJ of heat is liberated. If $ \Delta H^\circ $ for $ CO_2 (g) $ and $ H_2O (l) $ are -410 kJ and -285 kJ per mole respectively then the heat of formation of $ C_6H_6 (g) $ is
Abnormal colligative properties are observed only when the dissolved non-volatile solute in a given dilute solution
Aqueous CuSO$_4$ changes its colour from sky blue to deep blue on addition of NH$_3$ because

Identify A, B, and C in the following reactions:

For a reaction, $ 2A + B \to \text{products} $, if concentration of B is kept constant and concentration of A is doubled, then rate of reaction is
For an adiabatic change in a system, the condition which is applicable is
In dilute alkaline solution, $ \text{MnO}_4^- $ changes to