Science (English Medium) इयत्ता १२ - CBSE Question Bank Solutions

How can you prepare Cl₂ from HCl ? Write reaction only.

Write balanced equations for chlorine gas is passed into a solution of NaI in water.

Determine the density of Cesium chloride which crys tallizes in BCC type structure with the edge length 412.1 pm. The atomic masses of Cs and Cl are 133 and 35.5 respectively.

What type of linkage is responsible for the formation of proteins?

Write the product formed when glucose is treated with HI ?

Which type of solid conduct electricity in molten state but not in solid state?

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.