Science (English Medium) कक्षा १२ - CBSE Question Bank Solutions for Chemistry

In which the NH₃ is not used?

H₂S does not produce metallic sulphide with:

Chlorine acts as a bleaching agent only in presence of ____________.

When chlorine reacts with a cold and dilute solution of sodium hydroxide, it forms:

The cell membranes are mainly composed of:

The correct order of bond angles in the following species is:

When Cl₂ reacts with hot and conc. NaOH, the oxidation number of chlorine changes from ____________.

Chlorine reacts with excess of NH₃ to form:

Assertion: \[\ce{NaCl}\] reacts with concentrated \[\ce{H2SO4}\] to give colourless fumes with pungent smell. But on adding \[\ce{MnO2}\] the fumes become greenish yellow.

Reason: \[\ce{MnO2}\] oxidises \[\ce{HCl}\] to chlorine gas which is greenish yellow.

Chlorine water loses its yellow colour on standing because ______.

Convert the following:

Propan-1-ol to 2-Bromopropanoic acid

Assertion (A): Acetic acid but not formic acid, can be halogenated in the presence of red P and Cl₂.

Reason (R): Acetic acid is a weaker acid than formic acid.

What is the difference between a nucleoside and nucleotide?

The two strands in DNA are not identical but are complementary. Explain.

What is the difference between Nucleotide and Nucleoside? 

The mixture of concentrated HCl and HNO₃ made in 3 : 1 ratio contains:

The correct order of acid strength of oxyacids is:

The nucleic acid base having two possible binding sites is ____________.

The correct order of acid strength is:

On addition to conc. \[\ce{H2SO4}\] to a chloride salt, colourless fumes are evolved but in the case of an iodide salt, violet flames come out. This is because ______.