List of practice Questions

Which of the following elements is considered as a metalloid?
The role of depressants in ‘Froth Floation method’ is to
Boiling of hard water is helpful in removing the temporary hardness by converting calcium hydrogen carbonate and magnesium hydrogen carbonate to
The oxide which contains an odd electron at the nitrogen atom is
Which one of the following is an example of disproportionation reaction?
The most common oxidation state of Lanthanoid elements is +3. Which of the following is likely to deviate easily from +3 oxidation state?
The major product of the following reaction is:
 Chemical Reaction With No2FI
In the following structures, which one is having staggered conformation with maximum dihedral angle?
The IUPAC name of ethylidene chloride is:
The major product in the reaction is:
The major product in the reaction with product2-Methyl prop-1-ene
Using very little soap while washing clothes, does not serve the purpose of cleaning of clothes, because:
Which one of the following is an example of artificial sweetner?
\(120 \;g\) of an organic compound that contains only carbon and hydrogen gives \(330\) \(g\) of \(CO_2\) and \(270\) \(g\) of water on complete combustion. The percentage of carbon and hydrogen, respectively are
The energy of one mole of photons of radiation of wavelength \(300\) \(nm\) is (Given \(h\) = \(6.63 × 10^{–34}\)Js, \(N_A\) = \(6.02 × 10^{23}\) \(mol^{–1}\), \(c = 3 × 10^8\) \(ms^{–1}\))
The correct order of bond orders of \(C_2^{2-}, N_2^{2-}, O_2^{2-}\) is, respectively
At 25°C and 1 atm pressure,the enthalpies of combustion are as given below:
\(Substance\)\(H_2\)\(C(graphite)\)\(C_2H_6(g)\)
\(\frac{D_cH^{\theta}}{kJmol^{-1}}\)\(-286.0\)\(-394.0\)-1560.0

The enthalpy of formation of ethane is

For a first order reaction, the time required for completion of 90% reaction is ‘x’ times the half life of the reaction. The value of ‘x’ is (Given: In 10 = 2.303 and log 2 = 0.3010)
Metals generally melt at very high temperature. Amongst the following, the metal with the highest melting point will be
Which of the following chemical reactions represents Hall-Heroult Process?
In the industrial production of which of the following, molecular hydrogen is obtained as a byproduct?
Which one of the following compounds is used as a chemical in certain type of fire extinguishers?
\(PCl_5\) is well known, but \(NCl_5\) is not. Because,

Choose the correct answer :

1. The minimum energy that must be possessed by photons in order to produce the photoelectric effect with platinum metal is

[Given The threshold frequency of platinum is 1.3 × 1015 s–1 and h = 6.6 × 10–34 Js.]

Solute A associates in water. When 0.7 g of solute A is dissolved in 42.0 gof water, it depresses the freezing point by 0.2°C. The percentage association of solute A in water is :

[Given : Molar mass of A = 93 g mol–1. Molal depression constant of water is 1.86 K kg mol–1.]

The Ksp for bismuth sulphide (Bi2S3) is 1.08 × 10–73. The solubility of Bi2S3 in mol L–1 at 298 K is