List of top Chemistry Questions

20 g of NaCl is poured into a coffee cup calorimeter containing 250 mL of water. If the temperature inside the calorimeter drops 1°C by the time, the NaCl is totally dissolved, what is the heat of solution for NaCl and water? (specific heat of water is 4.18 J/g°C)
Which of the following solutions is the most concentrated? (assume 1 L of water has a mass of 1 kg)
The following equations indicate reactions that occur spontaneously.
Fe(s) + NiCl$_2$(aq) $\rightarrow$ FeCl$_2$(aq) + Ni(s)
Zn(s) + FeCl$_2$(aq) $\rightarrow$ ZnCl$_2$(aq) + Fe(s)
Ni(s) + PbCl$_2$(aq) $\rightarrow$ NiCl$_2$(aq) + Pb(s)
Which is the increasing order of the reactivity of the metals?
Given that
\[ \text{Zn}^{2+}(aq) + 2e^- \rightarrow \text{Zn}(s); \quad E^\circ_{\text{red}} = -0.76\,\text{V} \] \[ \text{Cr}^{3+}(aq) + 3e^- \rightarrow \text{Cr}(s); \quad E^\circ_{\text{red}} = -0.74\,\text{V} \] Calculate the equilibrium constant K at 25°C for the following balanced reaction,
\[ 3\text{Zn}(s) + 2\text{Cr}^{3+}(aq) \rightarrow 3\text{Zn}^{2+}(aq) + 2\text{Cr}(s) \]
In aqueous solution Cu(+1) salts are unstable because
Name the given compound : Cu(ClO$_4$)$_2$
Toluene reacts with excess of Cl$_2$ in the presence of sunlight to give a product which on hydrolysis followed by reaction with NaOH gives
A 25 mL sample of hard water is titrated with a 0.001 M solution of EDTA, and the end point of the titration is reached at 50 mL of EDTA added. What is the concentration of Ca$^{2+}$ and Mg$^{2+}$ ions in solution?
Calcium chloride is sometimes sprinkled on winter sidewalks to melt snow and ice. If 333g of calcium chloride is dissolved completely in 1.00 kg of water, what will be the freezing point of the solution? (The molal freezing point depression constant for water is 1.86°C kg/mol)
Which of the following periodic properties increases with increasing atomic number within a family in the periodic table?
What type of intermolecular bonding occurs in gaseous CH$_4$?
Describe the phase change for H$_2$O as pressure is raised at 100°C.
What is the total heat needed to change 1g of water from -10°C to 110°C at 1 atm? \[ \Delta H_{fusion} = 80 \, \text{cal/g}, \Delta H_{vaporisation} = 540 \, \text{cal/g}, \text{specific heat of ice and steam are 0.5 cal/g°C} \]
Which of the following statements is most likely true concerning the given reaction?
2A(g) + B(g) → 2C(g) + D(s)
Immediately, upon bringing a hot piece of metal into a room, the heat is felt from 5 m away. The type of heat transfer is probably
What is the IUPAC name for the following cycloalkane?
A 13 g gaseous sample of an unknown hydrocarbon occupies a volume of 11.2 L at STP. What is the hydrocarbon?
Which of the following demonstrates non-ideal behaviour of a gas?
Which of the following would be the most soluble in water?
Rechargeable batteries have become an essential part of our environmentally conscientious society. The nickel-cadmium cell battery is a rechargeable battery used in small electronic devices. The half reactions that take place in the nickel-cadmium battery during discharge are: Half reaction 1: Cd(OH)$_2$(s) + 2e$^{-}$ → Cd(s) + 2OH$^{-}$ Half reaction 2: 2NiO$_2$(s) + H$_2$O + 2e$^{-}$ → 2Ni(OH)$_2$(s) + 2OH$^{-}$ What is the oxidising agent in the nickel cadmium battery during discharge?
Which of the following is true for an electrolytic cell?
Given the following notation for an electrochemical cell,
Pt(s) $|$ H$_2$(g)$|$ H$^+$(aq) $//$ Ag$^+$(aq)$|$Ag(s)
Which of the following represents the overall balanced (net) cell reaction?
One mole of an ideal monatomic gas undergoes a process described by the equation $PV^{3}=$ constant. The heat capacity of the gas during this process is -
A plot of ln K against $\frac{1}{T}$ (abscissa) is expected to be a straight line with intercept on ordinate axis equal
Which of the two acids form anhydrides? (I) Oxalic acid (II) Succinic acid (III) Benzoic acid (IV) Phthalic acid