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What will be the $E^0$ value for the given half cell reaction?

$C{r}^{2+}\left(aq\right)+2e^{-}\to Cr\left(s\right)$

Given:

$E^0$ value for the half cell reaction,

$C{r}^{3+}\left(aq\right)+e^{-}\to C{r}^{2+}\left(aq\right);E^0=-0.41V$

$C{r}^{3+}\left(aq\right)+3e^{-}\to Cr\left(s\right);E^0=-0.74V$

Write three uses of acids.

What is environmental pollution?

What is a neutralization reaction? Give an example.

Question 6 (iii)
Mark ‘T’ if the statement is true and ‘F’ if it is false:

(iii) Sodium hydroxide and hydrochloric acid neutralise each other and form common salt and water.

Question 2

What is the major source of freshwater in the city/town/village where you live?

Among the following pair of compounds, the one that illustrates the law of multiple proportions is:

When acids and bases are mixed in water why is there a decrease in the H30+ or OH- ions

What is a polyatomic ion. Explain with an example.

Question 11
Here is a crossword puzzle: Good luck!


Across
3. Liquid waste products
4. Solid waste extracted in sewage treatment
6. A word related to hygiene
8. Waste matter discharged from human body

Down
1. Used water
2. A pipe carrying sewage
5. Micro-organisms which causes cholera
7. A chemical to disinfect water

Graphite is a good conductor of electricity because it has

What are the various sources of groundwater? [2 MARKS]

How does the Jal board provide water to our houses from rivers?

1. 50

If the rate constant for a first order reaction is k, the time (t) required for the completion of $99\%$ of the reaction is given by:

Show with the help of a sketch that the plants are the ultimate source of food.

When copper turnings are added to the silver nitrate solution, a blue coloured solution is formed after some time. It is because copper ____.

What will be the colour change on adding common salt dissolved in water to red litmus paper as well as blue litmus paper?

At 298 K, the conductivity of a saturated solution of AgCl in water is $2.6\times {10}^{-6}Sc{m}^{-1}$. Its solubility product at 298 K (given : ${\lambda }^{\infty }\left(A{g}^{+}\right)=63.0Sc{m}^{2}mo{l}^{-1},{\lambda }^{\infty }\left(C{l}^{-}\right)=67.0Sc{m}^{2}mo{l}^{-1})$

(a)

Use the Table above to answer the following questions about metals A, B, C and D.​

(i) Which is the most reactive metal?

Choose the correct option:



$Zn{OH}_2+$ ___ $\to ZnS{O}_4+2H_{2}O$

What exactly the vapor pressure help measure?

Coconut oil thickens in winter. Why does it happen?

Question 9:

What is the colour of methyl orange when a few drops of basic solution is added to it?

What will be the unit of rate constant $\left(k\right)$ for a second order reaction?

Which one of the following sets of conditions is necessary for a good cultivation of wheat Medium?

How do trees help in increasing rainfall?

Which elements took part in this reaction?

Arnav was observing his mother making breakfast for him from raw eggs and bread. He thought about the possibility of getting back a raw egg from the omelette. He reaches out to his teacher to know about this where he learns that it's not possible to get back raw eggs.

a. Why is it not possible to obtain raw eggs from an omelette?

b. What kind of change happens when an omelette is made from a raw egg?

If 250 ml of water percolates in a soil in 25 minutes, calculate the percolation rate of the soil.

is a process where a mixture made of two or more liquids with different boiling points can be separated from each other.