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Why does sulphur dioxide turns acidified potassium dichromate paper green

Why is nitrogen important for plants and animals?

What is the process of removing fleece of the sheep along with a thin layer of skin called?

A system X is neither in thermal equilibrium with Y nor with Z. The systems Y and Z:

Which of the following phenomena is explained by the figure given below?

Is S+O2 = SO2

Is this formula balanced?

What is the process happening in cotton plant?

The paths of alpha and beta s particles in an electrical field will be such that

What kind of cleaning agent is used for heavily soiled areas?

Which one of the following is an acidic oxide?

You are given a hammer, a battery, a bulb, wires and a switch.How could you use them to distinguish between samples of metals and non-metals?

Which of the following is/are classified as molecule of a compound?

According to Dalton, atoms were _____________ particles. [1 MARK]

Consider the following two situations, in which case the level of water will be higher?

Situation 1: Water in a beaker.

Situation 2: Same amount of water in the beaker with a sponge.

Identify the type of reactions:

1. CaO+H₂O-----Ca(OH) ₂

2. CuSO₄ + Zn ZnSO₄+Cu

3. N₂ + 3H₂ ----> 2NH₃

4. Fe+2HCl---->FeCl₂

5. C+O₂--->CO₂

6.H₂SO₄ + NH₄OH ----- H₂O + (NH₄)₂SO₄

7.Mg +Fe₂O₃ ------ Fe + MgO

Why silk is a strong fibre?

Except burning of candle find the which has both physical and chemical change in it ?

Consider the following reaction.
$CaC{O}_3$ + $H_{2}O$ + $C{O}_2$ $\to$ $Ca(HC{O}_3{)}_2$

$\begin{array}{cc}\text{Element}& \text{Number of atoms present}\end{array}$
$\begin{array}{ccc}& \text{Reactant side}& \text{Product side}\\ \text{Calcium}& 1& 1\\ \text{Carbon}& 2& Y\\ \text{Oxygen}& X& 6\\ \text{Hydrogen}& 2& 2\end{array}$
Recognise $X$ and $Y$. The value of $X+Y$ is___.

Difference between mixture and compounds

Which among the following layers of soil is the hardest?

Himanshu has two substances A and B. The extract of red cabbage turns green when mixed with A and turns pink when mixed with B. When a solution of A and B is taken it turns red litmus to blue. Which of the following statement(s) is/are correct?

Zinc oxide reacts with $Ca{\left(OH\right)}_2$ and $H_{2}S{O}_4$, thus it is called ________.

The gas produced when an acid reacts with marble is

What kind of element would you find on the far left-hand side of the periodic table?

How Does Air exerts pressure?

Sir can molecule have only one atom... Trying to understand monoatomic molecule..

The taste of orange juice is:

Which of the following materials did people use in ancient times for making clothes?

i. Leaves of trees
ii. Newspaper
iii. Metal foils
iv. Animal skins and furs

Match the following and choose the correct option:

What is canopy? [1 MARK]

According to Dalton, which of the following is the symbol of sulphur?

If sandy soil (of beaches) has the highest percolation rate then why do floods come in coastal areas??

Is the salt found in our oceans acidic, basic or neutral salt?

Choose the correct option:

What does a high percolation rate really mean?

Which of the following is a basic salt?

How is soil formed?

The process of rearing of silk worms to obtain silk is called

Which of the following options defines humus?

A blacksmith grinds the edges of an iron axe against a spinning wheel to sharpen it. Sparks of fire and heat are generated. We can say that it is a:

Question 26

Explain two neutralization reactions related to our daily lives.

Which of the following state has the maximum intermolecular forces of attraction?

How does PH scale work in our digestive system??

If acid falls on our hand , it is prescribed to apply base in that region . So in this process is there any salt formation on our hand ?

The Soap molecule has a