List of top Chemistry Questions on Some basic concepts of chemistry

From the given information, select the suitable law of chemical combination:

What will be the significant figure of the summation of 0.153, 153.2, and 1532?

If \(X\) is a haloalkane with a single chlorine atom per molecule and the percentage of Cl is 55, what would be the number of Cl atoms present in 0.1 g of the haloalkane? Atomic mass of Cl = 35.5 g/mol

A shell in projectile motion explodes while in motion, what is the trajectory of the center of the fragments?

Identify the herbicides from the following:
a) DDT b) Aldrin c) Sodium chlorate d) Nicotine e) Sodium arsenite

Which of the following pair is/are correctly matched?

Isotopes : Atoms with same atomic number but different atomic mass
Isobars : Atoms with same number of neutrons but different atomic number
Isotones : Atoms with same mass number but different atomic number
Select the correct answer using the code given below:

Select the INCORRECT statement/s from the following:

The technique used for purification of steam volatile water immiscible substance is:

For the reaction PCl5​→PCl3​+Cl2​, the rate and rate constant are 1.02×10−4mol L−1s−1 and 3.4×10−5s−1, respectively, at a given instant. The molar concentration of PCl5​ at that instant is:

For which one of the following mixtures is composition uniform throughout?

Identify the wrong relation for real gases:

In the analysis of III group basic radicals of salts, the purpose of adding NH₄Cl (solid) to NH₄OH is:

0.48 g of an organic compound on complete combustion produced 0.22 g of CO₂. The percentage of C in the given organic compound is:

The energy associated with the first orbit of He+ is:

Following Kjeldahl's method, 1g of organic compound released ammonia that neutralized 10 mL of 2M H\(_2\)SO\(_4\). The percentage of nitrogen in the compound is _________.%.

The fragrance of flowers is due to the presence of some steam volatile organic compounds called essential oils. These are generally insoluble in water at room temperature but are miscible with water vapour in vapour phase. A suitable method for the extraction of these oils from the flowers is -

Match List I with List II
\(\begin{array}{|c|c|c|} \hline \text{LIST I (Technique)} & & \text{LIST II (Application)} \\ \hline \text{A. Distillation} & & \text{I. Separation of glycerol from spent-lye} \\ \text{B. Fractional distillation} & & \text{II. Aniline - Water mixture} \\ \text{C. Steam distillation} & & \text{III. Separation of crude oil fractions} \\ \text{D. Distillation under reduced pressure} & & \text{IV. Chloroform-Aniline} \\ \hline \end{array}\)
Choose the correct answer from the options given below:

A compound X contains 32% of A, 20% of B and remaining percentage of C. Then, the empirical formula of X is:
(Given atomic masses of A=64; B=40; C=32 u)