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(a) In what form does oxygen gas occur in nature?
(b) In what form do noble gases occur in nature?

The shape of $C{O}_2$ molecule is

Difference between atomic mass and atomic number

Statement I: Nitrogen and Oxygen are the main components in the atmosphere but these do not react to form oxides of nitrogen.
Statement: II: The reaction between nitrogen and oxygen requires high temperature.

Why the nucleus of an atom is positively charged ?

What is atomic mass? And how much does 1u equals in kg?

What will be the rate of the reaction if 20 g of ammonia is formed in two minutes when nitrogen and hydrogen reacted completely?

Which of the following statement is correct?

The specific latent heat of vapourization of water is _______ .

Assume the following reaction is carried out in acidic medium.
$6e^{-}$ + $C{r}_2{O_7}^{2-}$ $⟶$2 ${Cr}^{3+}$ + $7H_{2}O$

How many $H^{+}$ do we need to add to the LHS to balance the H atoms?

Is heat ,cold ,smell and smell of perfume a matter

1) why melting point is a constant temperature?

2) why boiling point is a constant temperature?

a) Explain elements. What is its form i.e. either H₂​​​​​, hydrogen or H.

b) Define and explain the following:

1) True solution

2) Colloidal solution

3) Suspension

In the reaction
$C_2{O}_4^{2-}+Mn{O}_4^{-}+H^{+}\to M{n}^{2+}+C{O}_2+H_{2}O$ which is the reducing agent?

What reactants do we use for the laboratory preparation of hydrogen chloride?

In order to determine solubility of sodium iodide (NaI), 150g of saturated solution of sodium iodide(NaI) is evaporated to dryness at ${25}^0$C. At this stage 90 g of NaI is obtained. Find the solubility of NaI in water at ${25}^{\circ }$C.

In which of these pairs of atoms would the bond be the least polar (i.e., lowest percent ionic character)?

The number of electrons around each atom in an electronic dot structure of the compounds should always sum up to:

Rutherford's scattering experiment led to the discovery of:

The chemical which can be used to separate a mixture of carbon powder and sulphur powder successfully is :

(a) carbon dioxide (b) hydrochloric acid (c) hydrogen sulphide (d) carbon disulphide

What is meant by a chemical formula? Write the formulae of one element and one compound.

The oxidation number of chlorine in HOCl

Volatile and non-volatile component of a solid-solid mixture can be separated by the process of ____.

Which subatomic particle was discovered by:
(i) Chadwick?
(ii) Thomson?
(iii) Goldstein?

Calculate the normality of 1.11 gm of $CaC{l}_2$ is dissolved in 250 ml solution.

When a glass rod dipped in ammonia solution is brought near vapours of hydrochloric acid we see the formation of a dense white fume. What is this dense white fume?

What is the mass of 10 moles of $H_{2}O$?

(a) What is the nature of charge on cathode rays?

(b) State the properties of cathode rays.

Corresponding temperature in the Kelvin scale for 104°C is :-

Which of the following molecules shape can not be predicted by VSEPR theory?

What are the uses of Chlorine ?

What is a pollutant ?

Pick out the correct element from the following:

(i) C (ii) Si (iii) Pb (iv) Ge

What will be the IUPAC name of the given compound?

How can we separate sugar solution into the sugar and water?

In both 1st and VII group of the periodic table following property increases with increase in atomic number.

Good afternoon

My name is VANDITA YADAV and I am student of BYJUS 9th grade.

My doubt is related with chemistry : We have to learn the periodic table or just need to understand it.

In the first chapter of chemistry, the 2nd sub-chapter has table of cations where in the valency 4 - tetravalent elements, lead has the valency of 3+ instead of 4+. Is it an error or the lead has a valency of 3+ ? If yes then how?