Science (English Medium) इयत्ता ११ - CBSE Question Bank Solutions

On the basis of the equation \[\ce{pH}\] = – log \[\ce{[H+]}\], the \[\ce{pH}\] of 10^–8 mol dm^–3 solution of \[\ce{HCl}\] should be 8. However, it is observed to be less than 7.0. Explain the reason.

Assertion (A): A solution containing a mixture of acetic acid and sodium acetate maintains a constant value of \[\ce{pH}\] on addition of small amounts of acid or alkali.

Reason (R): A solution containing a mixture of acetic acid and sodium acetate acts as a buffer solution around \[\ce{pH}\] 4.75.

Assertion (A): An aqueous solution of ammonium acetate can act as a buffer.

Reason (R): Acetic acid is a weak acid and \[\ce{NH4OH}\] is a weak base.

The solubility product constant of Ag₂CrO₄ and AgBr are 1.1 × 10^–12 and 5.0 × 10^–13respectively. Calculate the ratio of the molarities of their saturated solutions.

Equal volumes of 0.002 M solutions of sodium iodate and cupric chlorate are mixed together. Will it lead to precipitation of copper iodate? (For cupric iodate K_sp = 7.4 × 10^–8).

A sparingly soluble salt gets precipitated only when the product of concentration of its ions in the solution (Q_sp) becomes greater than its solubility product. If the solubility of \[\ce{BaSO4}\] in water is 8 × 10^–4 mol dm^–3. Calculate its solubility in 0.01 mol dm^–3 of \[\ce{H2SO4}\].

The solubility product of \[\ce{Al(OH)3}\] is 2.7 × 10^–11. Calculate its solubility in gL^–1 and also find out pH of this solution. (Atomic mass of \[\ce{Al = 27 u}\]).

A sparingly soluble salt having general formula \[\ce{A^{p+}_x B^{q-}_y}\] and molar solubility S is in equilibrium with its saturated solution. Derive a relationship between the solubility and solubility product for such salt.

Name the software required to make a computer functional. Write down its two primary services.

How do different components of the computer communicate with each other?

Draw the block diagram of a computer system. Briefly write about the functionality of each component.

Name the input or output device used to do the following:

To output audio

Name the input or output device used to do the following:

To enter textual data

Name the input or output device used to do the following:

To make a hard copy of a text file

Name the input or output device used to do the following:

To display the data or information

Name the input or output device used to do the following:

To enter the audio-based command

Name the input or output device used to do the following:

To build 3D models

Name the input or output device used to do the following:

To assist a visually-impaired individual in entering data

Write base values of binary, octal, and hexadecimal number system.

What will be the output of the following statement?

list1 = [12,32,65,26,80,10]
list1.sort()
print(list1)