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

What happens when 

(i) PCl₅ is heated ? Write the reactions involved.

Give the reason for bleaching action of Cl₂.

Name two poisonous gases which can be prepared from chlorine gas.

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.

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 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 ______.

When RNA is hydrolysed, there is no relationship among the quantities of different bases obtained. What does this fact suggest about the structure of RNA?

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

The correct order of acid strength of oxyacids is:

Which of the following statements is true for protein synthesis?