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Which chemical formula correctly represents the compound having two hydrogen atoms, one carbon atom, and three oxygen atoms?

Why particles of ice have more energy than particles of water at 273 Kelvin?

How the apparatus are arranged in a distillation process?{diagram on textbook.}explain the arrangements.

(How to upload the diagrams in this?)

Explain "Latent heat of fusion."

how is distillation different from fractional distillation ? And 1 kelvin is equal to how many celcious ?

In the textile industries, which of the following is used to bleach cotton fabrics?

Calculate the number of atoms in 46g of Na.

What is meant by saying that metals are lustrous ?

Which of these is a polyatomic ion?

${{SO}_4}^{-2}$, ${{NO}_3}^{-1}$, ${{CO}_3}^{-2}$

Which of the following represent the correct Element and Symbol Pair?

(i) Cobalt –CO

(ii) Copper-Cu

(iii)Potassium- K

(iv) Calcium-C

(v) Silicon-Sl

(vi) Silver- Ag

(vii)Barium-Ba

(viii)Iron-Ir

__ is the international organization which approves the naming of elements. (Write only the abbreviation)

Which of the following can be used for the manufacturing of $C{O}_2$ fire extinguishers.

What is an isotope and Give any three applications of isotopes

Which among the following gas is released when an acid reacts with carbonates?

The number of moles of Cr and O in a compound are 4.8 x 10¹⁰ and 9.6 x 10¹⁰respectively. Its empirical formula is:

What is the importance of dissolved salts in water?

Calculate the number of moles of hydrogen atom in 72 gms of water.

Different allotropic forms of carbon is\are:

If in the reaction N_{​​​​​​2}​​O_{​​​​4(g)}<======> 2NO_2(g) ,x is a part of N₂O_​​4​​​

which dissociates , then the number of molecules at equilibrium will be

Describe the various steps involved in the separation of iodine, iron filings and salt from a mixture.

Iron powder and sulphur powder were mixed together and divided into two parts A and B. When part A was heated strongly over a burner, then a substance C was formed. The part B was, however, not heated at all. When dilute hydrochloric acid was added to substance C, then gas D was evoled and when dilute hydrochloric acid was added to part B then gas E was evolved.

(a) What type of substance is B ?

(b) What type of substance is C ?

(c) Name the gas (i) D, and (ii) E ?

(d) State one characteristic property of gas D.

(e) Write one test to identify gas E.

When does chlorine water decompose to hydrochloric acid?

Hydrogen chloride is a ________________ made of H⁺ and Cl^- ions, which are _____________ and ___________ respectively.

Which among the below mentioned is used to remove the impurity hydrogen sulphide from hydrogen gas:-

Rutherford's experiment on scattering of $\alpha$-particles showed for the first time that the atom has

What are the 3 differences between homogeneous and heterogeneous mixtures

An atom of sodium has an atomic number of 11 and a mass number of 23. Which of the following statements is correct?

Am i right in saying that all non-physical objects are objects which are not matter and physical objects include objects which are matter as well as which are not matter..

X and Y have atomic numbers 16 and 12 respectively. Write the formula of a compound formed by X and Y.

What valencies will be shown by the elements A, 13, C, D and E having atomic numbers 2, 4, 8, 10, and 13 respectively.

Define mixture. Why air is a mixture not a compound? Give four reasons. [5 MARKS]

Which is the correct representation of a neutralisation reaction?

Structural isomerism is possible only with saturated hydrocarbons having ___ or more carbon atoms.

Question 36
How is ethene prepared from ethanol?

Question 8(c)
Convert into mole:
(c) 22 g of carbon dioxide

Which of the following substances are elements ?

Water, Salt, Mercury, Iron, Marble, Diamond, Wood, Nitrogen, Air, Graphite, Hydrogen, Oxygen, Sugar, Chlorine

In acidic medium (Conc. H₂SO₄),Hydrogen peroxide reacts with K₂Cr₂O₇ in the presence of ether forms a deep violet coloured chromium peroxide. The Oxidation state of chromium in chromium pentoxide is

The number of electrons in a neutral atom with atomic number X and atomic mass Y will be:

What will be the atomicity of:

a) the molecule which is consumed during respiration and released during photosynthesis.

b) the red coloured element which is found on the tips of match sticks.

c) the pale blue gas which forms a layer that absorbs the sun's UV radiation.

Which type of reaction takes place when an iron nail is dipped in a solution of copper sulphate?

Types of mixture

What is the oxidation number of phosphorus in phosphoric acid ( $H_{3}P{O}_4$)?