List of top Chemistry Questions

The oxoacid of sulphur which has a lone pair of electrons on the sulphur atom is:
Identify 'X' along with the oxidation state of the halogen in the given reaction:
\[ 3\text{Cl}_2 + 6\text{NaOH} \rightarrow 5\text{NaCl} + X + 3\text{H}_2\text{O} \quad \text{(hot and conc.)} \]
Aspartame is the most successful artificial sweetener but is only limited to cold food and cold drinks because:
The minimum concentration of an electrolyte in millimoles per litre which is required to cause the precipitation of a sol in two hours is called as:
Which alloy is used for making bullets and lighter flints?
In amines, the nitrogen atom is A and B hybridised, making geometry of amines as C. Then A, B, and C respectively are:
Acetaldehyde and benzaldehyde can be best distinguished by:
In the cyanide extraction process of silver, the oxidising and reducing agents used are:
Which of the following reactions will not produce ketones?
Basic hydrolysis of esters produces:
Chemical formula of laughing gas is:

Match List - I with List - II.

Choose the correct answer from the options given below: 
 

The correct IUPAC name of  

is:
 

In case of phosphorus, PCl$_{3}$ and PCl$_{5}$ are possible while nitrogen only forms NCl$_{3}$ and not NCl$_{5}$. This is due to:

The rate law for the decomposition of hydrogen iodide is - = d[HI]/dt = k[HI]2. The units of rate constant k are: 

Consider the following statements about the oxides of halogens 
A. At room temperature, OF2; is thermally stable 
B. Order of stability of oxides of halogens is I > Br > Cl 
C. I2O5 is used in the estimation of CO 
D. ClO2; is used as a bleaching agent 
The correct statements are

The swelling in feet and ankles of an aged person due to sitting continuously for long hours during travel, is reduced by soaking the feet in warm salt water. This is because of:
Electrons in a cathode ray tube have been emitted with a velocity of \(1000\, m s ^{-1}\). The number of following statements which is/are true about the emitted radiation is _______ Given : \(h =6 \times 10^{-34} J s , m _e=9 \times 10^{-31} kg\) 
(A) The deBroglie wavelength of the electron emitted is \(66667 nm\)
(B) The characteristic of electrons emitted depend upon the material of the electrodes of the cathode ray tube 
(C) The cathode rays start from cathode and move towards anode 
(D) The nature of the emitted electrons depends on the nature of the gas present in cathode ray tube
\(CH_3 COOH\) solution turns red litmus into
Identify the hardest substance in the body.
\(2HCl + Zn\rightarrow\)
Methyl orange shows _____ colour in acidic solution.
Which of the following is not correct?
Quantum numbers of a subshell are n = 2 and l = 1. Identify the subshell.
l values of subshells d, s, f, p are respectively