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When a green salt is heated strongly it's colour finally changes to brown and odour of sulphur is given out.

i) Name the iron salt.

ii) Name the type of reaction that takes place during the heating of iron salt.

iii) Write the chemical equation for the reaction involved.

A cell is prepared by dipping a chromium rod in 1M Cr₂(SO₄)₃ solution and an iron rod in 1M FeSO₄ solution. The standard reduction potentials of Chromium and Iron electrodes are -0.75 V and -0.45 V respectively. What will be the standard EMF of the cell?

Is the volume of gases produced during electrolysis of water same? If not then what is the ratio in between them?

Name the stain which is used to prepare temporary mount of onion peel . From the following 1) safranine. 2) methylene blue

why does hydrogen has a ambigues position ??

Are all decomposition reactions endothermic?

Which of the following observations is true about dilute solution of acetic acid?

Choose the correct alternative :

(a) In a combined state, carbon occurs as

(i) coal

(ii) diamond

(iii) graphite

(iv) petroleum

(b) A crystalline form of carbon is

(i) lamp black

(ii) gas carbon

(iii) sugar

(iv) fullerene

(c) Graphite is not found in

(i) Bihar

(ii) Maharashtra

(iii) Orissa

(iv) Rajasthan

(d) Diamond is used for

(i) making the electrodes of electric furnaces.

(ii) making crucible for melting metals.

(iii) cutting and drilling rocks and glass.

(iv) making carbon brushes for electric motors.

(e) Carbon forms innumerable compounds because

(i) it has four electrons in its outermost shell.

(ii) it behaves as a metal as well as a non-metal.

(iii) carbon atoms can form long chains.

(iv) it combines with other elements to form covalent compounds.

Odisha is the leading producer of which ore of the following minerals?

Ordinary chlorine has has two isotopes${}_{17}^{35}CL$ and ${17}^{37}CL$ in the ration of 3:1 Calculate the relative atomic mass of chlorine.

Give a chemical test to distinguish between :

(a) dilute sulphuric acid and dilute hydrochloric acid,

(b) dilute sulphuric acid and conc. sulphuric acid.

Aqueous Urea solution is 20% by mass of solution. Calculate percentage by mass of solvent.

An iron knife kept in blue copper sulphate solution turns the blue solution into light green. Explain?

Arrange the following halogens in decreasing order of reactivity with alkynes.

Select the correct range of carbon atoms of alkene series which are liquid.

Which of the following is not a physical property of sulphuric acid?

Name an ore of zinc other than zinc oxide. And also name the process by which this ore can be converted into zinc oxide?[2 MARKS]

How to calculate pH level?

In reaction

$S{O}_2$ + $H_{2}S$ $\to$ $2H_{2}O$ + $3S$

the reducing agent is –

Select the most significant property of carbon.

In a double bond connecting two atoms, there is a sharing of

Which of the following is not a part of stereoisomers?

A shiny brown coloured element 'X' on heating in air becomes black in colour. Name the element 'X' , the black coloured compound formed and the reaction. [3 MARKS]

How to know the atomic number when two reactants react e.g.

H2+O2= H2O how it should give H2O2 or HO4

The maximum number of electrons in the shell with n = 3 is equal to

Explain how carboxylic acids are different from mineral acids from ionisation point of view. [2 MARKS]

(a) What is a chemical equation ? Explain with the help of an example.

(b) Giving examples, state the difference between balanced and unbalanced chemical equations.

(c) Balance the following chemical equations :

(i) $N{H}_3$ $⟶$ $N_2$ + $H_2$

(ii) C + $C{O}_2$ $⟶$ CO

The maximum covalence of the first member of each group is:

Write any two limitations of a chemical equation.

The correct electronic configuration for sodium ion is:

In hydrogenation of unsaturated fatty acids,___ is used as a catalyst.

Which of the following elements are most non-metallic in nature?

The full form of IUPAC is

1)$HCl$ 2) $C{H}_{3}COOH$ 3) $C{H}_{3}COONa$ 4) Rubber 5) common salt
(m) Strong electrolyte (n) Weak electrolyte (o) non-electrolyte

Which of the following is not an usage of ethanol?

Some crops are suitable for growing in soil with acidic nature. Which salt can be added, in order to increase the acidic nature of the soil?