List of top Chemistry Questions

Identify the correct statements with respect to cis / trans-2-butene from the following
I. cis-2-Butene is more polar than trans - 2 Butene
II. melting point of cis-2-Butene is greater than that of trans -2- Butene
III. boiling point of cis-2- Butene is greater than that of trans - 2- Butene
If the osmotic pressure of cane sugar solution is 2.46 atm at 27°C, then what is the concentration (in mol L\(^{-1}\)) of the solution (R = 0.0821 L atm mol\(^{-1}\) K\(^{-1}\))
A solution is formed by the combination of two liquids such as dichloromethane and chloroform. The partial pressures of dichloromethane and chloroform in solution are 285.5 and 62.4 mm Hg respectively. What is the total pressure of the solution?
The electrolyte used in mercury cell is
For a good quality cement the ratio of silica to alumina should be in the range of
Which of the following compound does not exhibit geometrical Isomerism?
Observe the following species \[ \text{AlCl}_3, \, \text{NH}_3, \, \text{H}^+, \, \text{Co}^{3+}, \, \text{OH}^-, \, \text{H}\text{Mg}^{2+}, \, \text{BF}_3, \, \text{Cl}^- \] How many Lewis bases are present in the above list?
One mole of \( A (g) \) is heated to \( T(K) \) till the following equilibrium is obtained \[ A(g) \rightleftharpoons B(g) \] The equilibrium constant of this reaction is \( 10^{-1} \). After reaching the equilibrium, 0.5 moles of A (g) is added and heated. The equilibrium is again established. The value of \( \left[\frac{A}{B}\right] \) is
In which one of the following pairs, both oxides are acidic?
Which of the following statement(s) is/are correct?
a) NaH is non-volatile hydride
b) MgH$_2$ is polymeric hydride
c) NH$_3$ is an electron precise hydride
d) H$_2$O is an electron rich hydride
Given below are two statements
Assertion (A): Ionic compounds are formed by non-directional bonds
Reasoning (R): They are soluble in nonpolar solvents
The correct answer is
At T (K), a gaseous mixture containing H₂, He and O$_$2 exerted a pressure of 1 bar. The weight percentage of H$_$2 and He is 20 and 16 respectively. The partial pressure (in bar) of H$_$2, He and O$_$2 is respectively
Observe the following reaction \[ \text{a} \, \text{P}_4(s) + \text{b} \, \text{OH}^-(aq) + \text{H}_2\text{O}(l) \rightarrow \text{c} \, \text{PH}_3(g) + \text{d} \, \text{H}_2\text{PO}_4^-(aq) \] a, b, c and d are respectively
If for the reaction \[ \text{CCL}_3(g) \rightarrow \text{C}(g) + 3\text{Cl}(g), \] the following data is given: \[ \Delta H^\circ_{\text{CCL}_3(l)} = 30 \, \text{kJ mol}^{-1}, \, \text{vap} = \text{vaporization} \] \[ \Delta H^\circ_{\text{CCl}_3} = -136.0 \, \text{kJ mol}^{-1}, \, f = \text{formation} \] \[ \Delta H^\circ_{\text{C}} = 714.0 \, \text{kJ mol}^{-1}, \, a = \text{atomization} \] \[ \Delta H^\circ_{\text{Cl}} = 242.0 \, \text{kJ mol}^{-1}, \, a = \text{atomization} \] The bond mean enthalpy of C-Cl in CCl\(_4\)(l) is: \[ \text{CCL}_4(g) \rightarrow \text{C}(g) + 3\text{Cl}(g) \text{ gives the bond mean enthalpy.} \]
If 5 L of an ideal gas at a constant external pressure of 2 atm expands isothermally to a final volume of \( X \) L, the system does a work of -2,026.4 J. \( X \) (in L) is
The following data is obtained for one mole of a gas. The gas deviates from ideal behavior in the pressure (in bar) range
gas deviates from ideal behavior
The angular momentum of electron in H atom in a particular n state is $\frac{h}{\pi}$. What is the energy in J required to excite the electron from this particular n state to (n+1) state?
Which one of the following indicates correct order of atomic size of the given elements?
The elements with metallic nature in the following are C, Si, Ge, Sn, Pb.
X and Y (major products) in the following reaction sequence are
X and Y (major products)
Which of the following is not correct about Grignard reagent?
Which of the following is the geminal dichloride?
Catechol and m-cresol respectively are
What are X and Y respectively in the following reaction? $$ CH_3CH_2CHO + 2Cu^{2+} + 5OH^- \rightarrow X + Y + 3H_2O $$
Hybridization of positively charged and negatively charged carbons of the following respectively are
Hybridization of positively charged