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How is crystallization better than evaporation? [3 MARKS]

Naphthalene can be separated from the sand :

(a) by sublimation (b) by distillation

(c) by crystallisation (d) by using water as the solvent

State one use of radioactive isotopes in medicine.

In the laboratory preparation of Nitric Acid, the role of concentrated sulphuric acid is

What is the meaning of intermingle

What is the meaning of constituent particles

Name a non-metal other than carbon which shows allotroy.

Can the answer be oxygen?

how to know wather a solution is collodial or suspension or just solution

In the following reaction, identify the substance, ‘X’ from the given options.
$Fe+CuS{O}_4\to X+Cu$

In which of the following can we observe the three states of matter?

To verify the law of conservation of mass in a chemical reaction a student takes a known amount of solution of barium chloride in a small test tube which is hanged in a sealed conical flask, containing the solution of $N{a}_{2}S{O}_4$. The flask is slightly tilted so that the two solutions get mixed with each other and a chemical reaction occurs. What is the relation between the masses of the chemicals involved?

What is the difference between elements and compounds

Which of the following statements about a compound is incorrect ?

(a) A molecule of a compound has atoms of different elements

(b) A compound cannot be separated into its constituent elements by physical methods of separation

(c) A compound retains the physical properties of its constituent elements

(d) The ratio of atoms of different elements in a compound is fixed

Is light a physical object?

Why it is difficult to cook at hill stations without pressure cooker?

What is the name of a particle which contains 10 electrons, 11 protons and 12 neutrons ?

Condensation is:

Explain why, osmosis can be considerd to be a special kind of diffusion. Classify the following into

(i) osmosis, and (ii) diffusion:

(a) swelling up of a raisin on keeping in water

(b) spreading of virus on sneezing

(c) earth worm dying on coming in contact with common salt

(d) shrinking of grapes kept in thick sugar syrup

(e) preserving of pickles in salt

(f) spreading of smell of cake being baked in the kitchen

(g) aquatic animals using oxygen dissolved in water during respiration

Bromine particles are almost twice as heavy as chlorine particles.Which gas will diffuse faster; bromine (vapour) or chlorine ? Explain your answer.

Identify the constituent element(s) present in both carbohydrates and fats.

(a) Why does temperature in Mumbai and Chennai not fall as low as it does in Delhi?

(b) Give the properties of water responsible for controlling the temperature of our body.

What do you mean by the atomic mass?

Give examples of diffusion of gas into solid

Examples of solid in solid solution

Can you give me all formulas of atoms and molecules as it will help me as exams are approaching?

Energy of orbit-

Which one of the following is correct order of increase of size?

What is pH?

Where [A] denotes the concentration of A.

The empirical formula of a compound is CH₂Cl. If the molecular mass of the compound is 99 g, what is the molecular formula of the compound?

Which method is used to separate cream from milk?

Which of the following is a tribasic acid?

The electrons, identified by quantum numbers n and l
(i) n = 4, l = 1 (ii) n = 4, l = 0 (iii) n = 3, l = 2 (iv) n = 3, l = 1
can be placed in order of increasing energy, from the lowest to highest, as

Statement I: Iron feels different from wood.

Statement II: It is because their atoms are same but their arrangement in the subsequent substance is different.

Why do snow directly changes into vapour in very cold places

Define melting point?

Give Reasons:

Steam produces more severe burns as compared to boiling water.

Is cutting of trees physical change or a chemical change? Explain .

According to google it's chemical change .

Crude petroleum oil is a complex mixture of organic liquids that occurs naturally beneath Earth’s surface. It was formed millions of years ago. Crude oil is vaporized and made to undergo fractional distillation where its components get separated as shown in the figure.

The organic liquids present in crude oil are separated in a fractional distillation chamber because they have different

Which among the following compounds are formed when an alkali metal reacts with hydrogen and halogen respectively?

Question 6 (d)
The position of three elements A, B and C in the periodic table are shown below –
$\begin{array}{cc}\text{Group 16}& \text{Group 17}\\ -& -\\ -& \text{A}\\ -& -\\ \text{B}& \text{C}\end{array}$

Which type of ion, cation or anion, will be formed by element A?