List of top Chemistry Questions

Which of the polymer is used in the controlled release of drug?
If standard molar enthalpy change and standard molar internal energy change measured in bomb calorimeter are equal, which one of the following statements is correct?
Two alkali halide salts, \[ \text{ACl} \] and \[ \text{BCI} \] gave crimson red and violet in their flame test respectively. A and B are respectively
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\(^{-1}\))
The energy (in J) released when an excited electron of 5$^{\text{th}}$ orbit of hydrogen atom returns to its ground state is
Which of the following drug is used on diseased skin surface?

Basicity order of the following amines in aqueous medium
i) N-Methylaniline i
i) N, N-Dimethylaniline 
iii) Aniline

If the enthalpy and entropy change for a reaction at 298 K are -145 kJ mol$^{-1}$ and -650 J K$^{-1}$ mol$^{-1}$ respectively, which one of the following statements is correct?

Which of the following exhibits optical isomerism?

A first-order reaction has the rate constant of \(1.15 \times 10^{-3} \, \text{s}^{-1}\). The time required to reduce 10 g of reactant to 6 g is \(x \times 10^2\) sec. What is the approximate value of \(x\)?
1.06 g of Na$_2$CO$_3$ (molar mass = 106 g mol$^{-1}$) is dissolved in 500 g water. What is its molality?
DDT is
Among the following the appropriate reactants for the preparation of 1–ethyl cyclohexanol are
The minimum number of quantum numbers required to specify an orbital in an atom is
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
Which of the following aqueous solutions has the highest osmotic pressure?
The correct order of bond angles of the following is
I. \( \text{H}_2\text{O} \)
II. \( \text{NH}_3 \)
III. \( \text{CH}_4 \)
IV. \( \text{SO}_2 \)
The standard electrode potential (in V) values for Al$^{3+}$/Al, Tl$^{3+}$/Tl are respectively
In which of the following reactions is ${H_2O}$ oxidized?
I. Photosynthesis
II. ${H_2O + F_2}$
III. ${H_2O + H_2}$
IV. ${H_2O + P_4O_{10}}$

Which is the correct option for the following reaction? \[ 2\,\text{CH}_3\text{CH}_2\text{Br} \xrightarrow{\text{2Na/Dry ether}} \text{?} \]

Among the following, the correct statements are
I. Lithium forms solid hydrogen carbonate
II. LiCl is soluble in ethanol
III. The formula of lithium oxide is LiO
IV. Lithium hydroxide decomposes on heating

The number of following pairs of elements which exhibit diagonal relationship is:

  • i. B & Si
  • ii. Be & Al
  • iii. Li & Mg
  • iv. Al & S
Arrange the following free radicals in the correct order of their stability:
Identify the pair in which both are not extensive properties.
Identify the correct statements about chemisorption:
  • I) It is irreversible adsorption
  • II) Enthalpy of adsorption is in the range of 20-40 kJ mol\(^-1\)
  • III) It is unlayered adsorption
  • IV) It does not need appreciable activation energy