List of top Chemistry Questions

Which of the following is correct statement?
An alkene ‘X’ (C\(_4\)H\(_8\)) does not exhibit cis/trans isomerism. Reaction of ‘X’ with Br\(_2\)/CCL\(_4\), followed by reaction with reagent ‘Y’ gave ‘Z’ (C\(_6\)H\(_6\)). What are ‘Y’ and ‘Z’ respectively?
Observe the following two statements: I. For an isolated system, \( \Delta U = 0 \); \( q = 0 \) II. For a closed system, \( \Delta U = 0 \); \( q \neq 0 \) The correct answer is
In Ostwald process of manufacture of nitric acid, 12 moles of NH3 was completely oxidized in air by a catalyst at 500 K and 9 bar. The resultant NO(g) was completely oxidized to NO2(g) and dissolved in water to form nitric acid and NO(g). What is the weight (in g) of nitric acid formed?
The correct order of reducing power of alkali metals in aqueous solution is
Two statements are given below: I. Sodium hexametaphosphate is used in calgon method for removal of permanent hardness of water II. Lithium forms interstitial hydrides Identify the correct answer
Electromagnetic radiation has electric and magnetic field components. These two components:
The first ionization enthalpies of the elements X, Y, Z of the second period are 899, 1402, 520 kJ/mol respectively. X, Y, Z respectively are:
An alcohol X (C\(_5\)H\(_{12}\)O) when reacted with conc. HCl and anhydrous ZnCl\(_2\), produces turbidity instantly. The alcohol X can be prepared from which of the following reactions?
The reagents/ chemicals X and Y that convert cyanobenzene to Schiff's base are
Among the following, the incorrect statement about chloramphenicol is:
The correct statements of the following are: A) Aniline forms a stable benzene diazonium chloride at 285K.
B) N - Phenylethanamide is less reactive towards nitration than aniline.
C) p - CH\(_3\)C\(_6\)H\(_4\)COCl is Hinsberg reagent.
Identify the correct statements from the following: (i) Ti (IV) is more stable than Ti (III) and Ti (II)
(ii) Among 3d-series elements (from Z = 22 to 29) only copper has positive reduction potential (\( M^{2+}/M \)) (iii) Both Sc and Zn exhibit +1 oxidation state
The molecular formula of a coordinate complex is CoH\(_{12}\)O\(_6\)Cl\(_3\). When one mole of this aqueous solution of complex is reacted with excess of aqueous AgNO\(_3\) solution, three moles of AgCl were formed. What is the correct formula of the complex?
Identify the set which is not correctly matched in the following:
Which of the following when subjected to thermal decomposition will liberate dinitrogen? (i) sodium nitrate (ii) ammonium dichromate (iii) barium azide
Observe the following reaction. This reaction represents: \[ 4HCl + O_2 \xrightarrow{CuCl_2, 723K} 2Cl_2 + 2H_2O \]
For a first-order reaction, a plot of \( \ln k \) (y-axis) and \( \frac{1}{T} \) (x-axis) gave a straight line with a slope equal to \( -10^4 \) and an intercept equal to 2.303 (on the y-axis). What is the activation energy \( E_a \) (in kJ/mol) of the reaction? (Given \( R = 8.314 \, \text{J mol}^{-1} \text{K}^{-1} \))
The molecular formula of a compound is \( AB_2O_4 \). Atoms of O form a ccp lattice. Atoms of A (cation) occupy \( \frac{1}{8} \) of tetrahedral voids. Atoms of B (cation) occupy a fraction of octahedral voids. What is the fraction of vacant octahedral voids?
Identify the correct statements from the following: A) At 298 K, the potential of the hydrogen electrode placed in a solution of pH = 10 is -0.59 V.
B) The limiting molar conductivity of \( \text{Ca}^{2+} \) and \( \text{Cl}^- \) is 119 and 76 \( \text{S cm}^2 \text{mol}^{-1} \), respectively. The limiting molar conductivity of \( \text{CaCl}_2 \) is 195 \( \text{S cm}^2 \text{mol}^{-1} \).
C) The correct relationship between \( K_c \) and \( E_{\text{cell}} \) is \( E_{\text{cell}} = \frac{2.303RT}{nF} \log K_c \).
Adsorption of a gas (A) on an adsorbent follows Freundlich adsorption isotherm. The slope and intercept (on y-axis) of the isotherm are 0.5 and 1.0, respectively. What is the value of \( \frac{x}{m} \), when the pressure of the gas (A) is 100 atm?
Distilled water boils at 373.15 K and freezes at 273.15 K. A solution of glucose in distilled water boils at 373.202 K. What is the freezing point (in K) of the same solution? (For water, \( K_b = 0.52 \) kg mol\(^{-1}\), \( K_f = 1.86 \) kg mol\(^{-1}\))
A low boiling point metal contains high boiling point metal as impurity. The correct refining method is
The common components of photochemical smog are:
The number of activating and deactivating groups of the following are respectively: \[ -OCH_2CH_3, -COCH_3, -NHCOCH_3, -COOCH_3, -SO_3H \]