List of top Chemistry Questions

A certain reaction is non spontaneous at 298K. The entropy change during the reaction is 121 $JK^{-1}.$ Is the reaction is endothermic or exothermic ? The minimum value of $\Delta$H for the reaction is
Which of the following transition of an electron in H-atom will emit maximum energy?
The Autotrophic mode of nutrition requires :
Which of the following does not contain a carboxyl group : \(-COOH\)
Correct formula of sodium peroxide is :
In the periodic table the position of the element still uncertain is of :
Alveoli and villi both increases :
An element with atomic number 20 will be placed in which period of the periodic table :
Glucose is broken down to 3-carbon compound called :
The most electronegative element in the periodic table is :
Symbol of silver is :
Which among the following is the lightest particle :
Which of the following is used to make non-stick cookware :
Gold mines are located in India at :
General formula of an alkyne is :
Isotopes of an element have the same :
The molecular mass of \(\text{H}_2\text{SO}_4\) acid is :
Aquaregia contains 3 parts of concentrated HCl and ____.
When Magnesium (Mg) burn in air, we get Magnesium ____ .
Bleaching powder is obtained by passing chlorine over :
An ant sting contains :
Red litmus paper turns blue in the solution the pH can be :
Which among the following is an insulator :
During evaporation particles of a liquid change into vapour :
How many electrons, protons and neutrons are present in Y\(^+\), if atomic number of Y is 19 and mass number of Y is 39 :