📚NCERT Questions
1,675 solved questions with detailed explanations
In the estimation of sulphur by Carius method, 0.157 g of an organic compound yielded 0.4813 g of BaSO₄. What is the percentage of sulphur in the compound? (Atomic mass S=32, Ba=137, O=16)
The process of converting sulphide ores into oxides by heating strongly in the presence of excess air is called:
What causes the permanent polarization of a bond in an organic molecule due to the influence of an atom or a substituent group?
What is the oxidation number of oxygen in superoxides like KO2?
The brain is protected by a bony box called the:
Combustion reactions are generally characterized by which enthalpy change property?
If two or more identical substituent groups are present in an alkane, what prefixes are used, and how are they considered in alphabetical order?
Reactions in which energy is absorbed are known as:
Metals at the bottom of the activity series are often found in nature in which state?
Which of the following statements best describes the general principle of control and coordination in multicellular organisms?