Zinc liberates hydrogen gas when reacted with dilute hydrochloric acid, whereas copper does not. Explain why?
[Class 10 Science]
(3)
What is the pH of 0.001 M aniline solution. The ionization constant of aniline is 4.27 x ${{10}^{-4}}$. Cal-culate the degree of ionization of aniline in the solution. Also calculate the ionization constant of the conjugate acid of aniline?
[CBSE Class 11 Chemistry]
(2)
Write a letter to your friend telling him about the annual day celebration in your school and write it in 150 to 200 words
[CBSE Class 10]
(2)
How do the logos and certification on cover help the consumers to buy standardised products?
[CBSE Class 10 Social]
(2)
How are consumers exploited in the marketplace? Explain with three examples
[CBSE Class 10 Social]
(3)
"Advancement of international trade of a country is an index of its economic prosperity”
[CBSE Class 10 Social]
(3)
(a) The ratio of the widths of two slits in Young's double slit experiment is 4 : 1. Evaluate the ratio of intensities at maxima and minima in the interference pattern
[CBSE Class 12 Physics]
(4)
Briefly explain the incident of the Jallianwala Bagh massacre and its effects on Punjab
[CBSE Class 10 Social]
(2)
What type of flag was designed during the ‘Swadeshi Movement’ in Bengal? Explain its main features
[CBSE Class 10 Social]
(2)
Use Lenz’s law to determine the direction of induced current in the situations described by figure
[CBSE Class 12 Physics]
(3)
Use Kirchhoff s rules to determine the value of the current $I_{1 }$ flowing in the circuit shown in the figure
[CBSE Class 12 Physics]
(3)