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State whether the following statement is true or false :

A chemical equation can be balanced easily by altering the formula of a reactant or product.

Silver and gold does not react with oxygen even at a very high temperature and are called as ____.

Which of the following pair does not react either with cold or hot water?

Which of the following is the anhydride of $HN{O}_3$

Which of the following molecules have a coordinate bond in them?

An element crystallises into a structure which may be described by a cubic unit cell having one atom at each corner of the cube and two atoms on one of its diagonals. If the volume of this unit cell is $24\times {10}^{-24}{\text{cm}}^3$ and density of element is $7.2{\text{g/cm}}^3$. Calculate the number of atoms present in $200\text{g}$ of the element.

(a) A flask contains 3.2 g of sulphur dioxide. Calculate the following:

(i) The moles of sulphur dioxide present in the flask.

(ii) The number of molecules of sulphur dioxide present in the flask.

(iii) The volume occupied by 3.2 g of sulphur dioxide at STP. (S = 32, O = 16)



(b) The reaction of potassium permanganate (VII) with acidified iron (II) sulphate is given below:

2KMnO₄ + 10FeSO₄ + 8H₂SO₄ $\stackrel{}{\to }$ K₂SO₄ + 2MnSO₄ + 5Fe₂(SO₄)₃ + 8H₂O

If 15.8 g of potassium permanganate (VII) was used in the reaction, calculate the mass of iron (II) sulphate used in the above reaction. (K = 39, Mn = 55, Fe = 56, S = 32, O = 16)

Which of the following gas is released when sulphur reacts with conc. nitric acid?

Which one of the following salts on dissolution in water will give a solution of pH less than 7?

A highly reactive element X is stored under water. It readily reacts with the oxygen in air to give a compound Y which dissolves in water. The aqueous solution of Y changes a blue litmus solution to red. The element X is :

$FeS{O}_4$ reacts with ammonium hydroxide to give dirty green precipitate of metallic hydroxide which is insoluble in excess of $N{H}_{4}OH$ . Name this precipitate.

The general formula of cyclic alkanes is-

In which of the following reactions does $N{H}_3$ act as an acid ?

The bonds between P atoms and Cl atoms in $PC{l}_5$ are likely to be

Which of the following activity you should never do in a chemistry lab?

A substance X which is used as an antacid reacts with dilute hydrochloric acid to produce a gas Y which is used in one type of fire-extinguisher. Name the substance X and gas. Y. Write a balanced equation for the chemical reaction which takes place.

Which one of the following is correct order of the size of iodine species?

Select the correct structural formula for 2-pentene.

Which of the following option has the incorrect combination considering List-I and List-II

Name the gas evolved when dilute HCl reacts with sodium hydrogencarbonate. How is it recognised

1) one gram of substance of relative density 2 and 4 gram of another substance of relative density 3 are mix together. the relative density of the mixture is about?

1) two identical containers have liquid of different densities d1 and d2 but they weigh the same when kept on a weighing Pan .the density of the mixture when they are mixed together will be?

What is the reason behind expansion of water below 4°C ?

Fuming nitric acid has?

The total number of ions produced by one molecule of CaCl₂ is:

Convert :
(a) Two soluble metallic nitrates to insoluble metallic chlorides using dil. HCl.
(b) Hydrochloric acid to nascent chlorine.

What is the coordination of cation and anion in flourite structure $Ca{F}_2$?

Which of the following is an isomeric pair?