List of top Chemistry Questions

Vinegar and butter are the sources for which of the following carboxylic acids respectively?
Identify X, Y and Z in the following reactions sequence:
X, Y and Z in the following reactions sequence
Which of the following produces nitrogen gas after the reaction with nitrous acid?
The number of metalloids in the following elements are: Si, Mn, B, F, Cu, Ag, K, Sb, As, Na, Ge
The number of following statements which are incorrect line emission

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

  • i. B & Si
  • ii. Be & Al
  • iii. Li & Mg
  • iv. Al & S
The correct order of atomic radii of B, Be, N and C is
The vapors of 1 g of an element occupy 2.5625 L exerting a pressure of 0.5 atm at 1000 K. What is the molar mass (in $\text{g mol}^{-1}$) of the element? (Assume vapors follow ideal gas equation. Given $R = 0.082 \text{ L atm mol}^{-1} \text{K}^{-1}$)
A gas obeys Charles' law in the temperature range 0--500 K at a given pressure. Its volume changes to zero at temperature of
Identify the pair in which both are not extensive properties.

The standard enthalpy of formation of $CO_2$(g), ${CaO(s)}$ and ${CaCO_3(s)}$ are -393, -634, -1210 kJ mol$^{-1}$ respectively. If all the substans are in standard state, the standard enthalpy of decomposition of calcium carbonate to ${CaO(s)}$ and ${CO_2(g)}$ (in kJ mol$^{-1}$) is

Which of the following pairs form a precipitate of AgCl? 
(v) 1L of $10^{-5}~\text{M}$ NaCl is common. Test combinations with: $10^{-6}$ $M {AgNO_3} $

In which of the following reactions is ${H_2O}$ oxidized?
I. Photosynthesis
II. ${H_2O + F_2}$
III. ${H_2O + H_2}$
IV. ${H_2O + P_4O_{10}}$
Thermodynamically most stable allotrope of carbon is

What are X, Y in the following reaction sequen?

Silver forms CCP structure and its density is $10.5~\text{g/cm}^3$. What is the edge length of the unit ll? (Molar mass of silver is $107.9~\text{g/mol}$)

What is the boiling point of solution of 0.1 m KCl? 
K$_b$ of water is 0.52 K kg mol$^{-1}$, $\alpha = 100%$ (water boils at 373 K)

Which of the following is correct with respect to the graph given?
[R] = Conntration at time 't' 
[R]$_0$ = Initial conntration 

Some statements about Leclanche ll are:
Anode is zinc metal
Cathode is graphite rod surrounded by powdered {MnO2} and carbon
Electrolyte is a moist paste of ZnO and KOH
Oxidation product is ZnO

Match the following

List – I

(Dispersed Phase – Dispersion medium)

A) Solid – Liquid

B) Liquid – Liquid

C) Solid – Gas

D) Liquid – Solid

List – II

(Type of colloid)

I) Gel

II) Aerosol

III) Sol

IV) Emulsion

The correct answer is

S-I: Scattering of light by dispersed particles of colloidal system is known as Tyndall effect.
S-II: The diameter of the dispersed particles should not be much smaller than the wavelength of the light used.
The metal purified by Mond pross is X and metal purified by van Arkel method is Y. X and Y respectively are:
Manganese dioxide on heating with conntrated hydrochloric acid gives a greenish yellow gas, X. With exss of ammonia X gives Y and Z. Y and Z respectively are
The spin-only magnetic moment of ${[MnBr4]^2-}$ is 5.9 BM. The geometry of the complex and x respectively are

Which of the following are correct? 
i. V$^{2+}$ liberates hydrogen from a dilute acid
ii. The earlier members of lanthanide series behave more like aluminium 
iii. The ‘silver’ UK coins are made of CuNi alloy 
iv. The maximum oxidation state exhibited by Neptunium is +7