List of top Chemistry Questions

Match the following:
The correct answer is:
The S\(_{\text{N}}\)1 reactivity of the following halides will be in the order
I) C\(_{\text{6}}\)H\(_{\text{5}}\)CH\(_{\text{2}}\)Br
II) (C\(_{\text{6}}\)H\(_{\text{5}}\))\(_2\)CHBr
III) (C\(_{\text{6}}\)H\(_{\text{5}}\))\(_2\)C(CH\(_{\text{3}}\))Br
IV) (CH\(_{\text{3}}\))\(_2\)CHBr
Which of the following is a synthetic progesterone ?
Match the following
The pyrimidine bases found in RNA are
Consider the following halogen-containing compounds:
The compounds with a net dipole moment are:
Glucose on reaction with HCN forms a compound 'A'. Acid hydrolysis of A gives B. The molecular formula of B is:
What are X and Y respectively in the following reaction sequence ?
HNO3
In 3d series, a metal ‘X’ has highest second ionisation enthalpy. The spin only magnetic moment (in BM) of X$^{2+}$ ion is
In the extraction of which of the following metals, the ore is concentrated by leaching process?
I) Ag
II) Au
III) Zn
IV) Al
At T(K), adsorption of a gas on surface of a solid follows Freundlich adsorption isotherm. A graph of \( \log \left( \frac{x}{m} \right) \) (on y-axis) and \( \log p \) (on x-axis) for this gas gave a straight line with slope = 2 and intercept = 1.5. What is the value of n ?
The reactions which give $ \text{XeO}_3 $ as one of the products are:
I) Complete hydrolysis of $ \text{XeF}_2 $
II) Complete hydrolysis of $ \text{XeF}_4 $
III) Complete hydrolysis of $ \text{XeF}_6 $
Which of the following is an example of a negatively charged sol?
Match the following

The correct answer is:
At 298 K the emf of the cell given below is 0.87 V.
Pt, \( \text{H}_2(1 \text{ atm})|\text{H}^+(\text{aq}) || \text{Ag}^+(1 \text{ M})|\text{Ag}(\text{s}) \)
The pH of the acid solution is
(Given : \( \text{E}^{\circ}_{\text{Ag}^+|\text{Ag}} = 0.80 \text{ V}; \text{E}^{\circ}_{2\text{H}^+|\text{H}_2} = 0.0 \text{ V}) \)
The crystal system of a compound with cell dimensions \( a = 0.387 \), \( b = 0.387 \), \( c = 0.504 \text{ nm} \); \( \alpha = \beta = 90^{\circ} \) and \( \gamma = 120^{\circ} \) is
0.25 moles of $ \text{CH}_2\text{FCOOH} $ was dissolved in $ 0.5 \, \text{kg} $ of water. The depression in freezing point of the resultant solution was observed as $ 1^\circ \text{C} $. What is the van't Hoff factor? ($ K_f = 1.86 \, \text{K kg mol}^{-1} $)
At T(K) vapour pressure of pure benzene and toluene are 500 and 200 mm Hg respectively. If they form an ideal solution, what is the mole fraction of toluene in a mixture boiling at T(K) at a total pressure of 380 mm Hg ?
What are X and Y respectively, in the following set of reactions ? \[ \text{CH}_3\text{CH}_3 + 3\text{O}_2 \xrightarrow{\text{(CH}_3\text{COO})_2\text{Mn, }\Delta} \text{X} \] \[ \text{CH}_3\text{CH}=\text{CH}_2 \xrightarrow{\text{KMnO}_4/\text{H}^+} \text{Y} \]
The decomposition of AB\(_3\)(g) is a zero order reaction. At 300 K, the rate constant of the reaction is \(2.5 \times 10^{-4}\) mol L\(^{-1}\) s\(^{-1}\). What is the rate of reaction (in mol L\(^{-1}\) s\(^{-1}\)) when the concentration of AB\(_3\)(g) is taken as 10\(^{-1}\) mol L\(^{-1}\) at 300 K?
In Lassaigne’s test, when both nitrogen and sulphur are present in an organic compound, a blood-red colour is observed upon adding FeCl$_3$ to the sodium fusion extract. This colour is due to the formation of X. What is X?
At 25 \(^{\circ}\)C, \( K_a \) of acetic acid is \( 1.8 \times 10^{-5} \). What is the percentage of ionization of 0.02 M acetic acid at this temperature?
Identify the correct statements
I) Enthalpy is an intensive property
II) For, H$_2$O(l) $\longrightarrow$ H$_2$O(g) process, $\Delta S$ increases
III) Entropy is a state function
Which one of the following is an example of physical equilibrium?
Ammonium chloride on reaction with calcium hydroxide gives a gas X. The incorrect statement about X is