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Mehak wanted to prepare an alkane, she added soda lime to sodium ethanoate. The reaction that took place would be: ${\mathrm{CH}}_3\mathrm{COONa}+\mathrm{NaOH}+\mathrm{CaO}\stackrel{\Delta }{\to }{\mathrm{Na}}_2{\mathrm{CO}}_3+$

Give reasons for the following :

(a) Electrolysis of molten lead bromide is considered to be a reaction in which oxidation and reduction go side, i.e., a redox reaction.

(b) The blue colour of aqueous copper sulphate fades when it is electrolysed using platinum electrodes.

(c) Lead bromide undergoes electrolytic dissociation in the molten state but is a non- electrolyte in the solid state.

(d) Aluminium is extracted from its oxide by electrolytic reduction and not by conventional reducing agents.

(e) The ratio hydrogen and oxygen formed at the cathode and anode is 2: 1 by volume.

(f) In the electrolysis of acidified water, dilute sulphuric acid is preferred to dilute nitric acid for acidification.

(g) Ammonia is unionised in the gaseous state but in the aqueous solution, it is a weak electrolyte.

(h) A graphite anode is preferred to other inert electrodes during electrolysis of fused lead bromide.

(i) For electroplating with silver, silver nitrate is not used as the electrolyte.

(j) Carbon tetrachloride is a liquid but does not conduct an electrolyte.

(k) Potassium is not extracted by electrolysis of its aqueous salt solution.

The chlorobenzene can be converted into benzene by reduction with nascent hydrogen produced by an alloy(metallic) in the presence of alkali, the metallic alloy used is

(a) Ethylene when reacts with halogens (chlorine and bromine) form saturated products. Name them and write balanced equations.
(b) Give the conditions and the main product formed by hydrogenation of ethylene.

When copper pyrite is roasted in excess of air, a mixture of $C{u}_{2}S$ and $FeO$ are formed. FeO is present as impurity. This can be removed as slag during Smelting. The flux added to form slag is

Question 3

How are living organisms dependent on the soil? Are organisms that live in water totally independent of soil as a resource?

what are the important eqation to be remembered for test? like H2SO4 etc..

How can we write CO+(1/2)O2 gives rise to CO2

Which of the following metals is less reactive than hydrogen?

Determine the number of hydrogen atoms in 360 g of glucose.

Given, the molecular formula of glucose is C${}_6$H${}_1$${}_2$O${}_6$.

According to mole concept it says that a standard volume i.e 22.4 liters of gas contains 1 mole right?

And one mole contains 6.023*10²³ right sir so then how did they come to know this, means as if they counted each and every atom or molecule ?

So please explain about this sir.

In which of the following reaction the physical state of the reactants or the product is not correctly represented?

A drop of colourless liquid is poured over blue litmus paper and it turns to red. The colourless liquid is:

Four students A, B, C and D were studying the effect of the solutions of hydrochloric acid, sodium hydroxide, sodium chloride and pure water respectively on blue litmus solution. Which of the students observed the colour change of blue litmus solution to red?

(1) A

(2) B

(3) C

(4) D

Question 17

Paheli was feeling thirsty but there was only a pot of water at home which was muddy and unfit for drinking. How do you think Paheli would have made this water fit for drinking if the following materials were available to her.

Which of the following group of elements is the most electronegative?

(a) Explain why metals usually do not liberate hydrogen gas with dilute nitric acid.
(b) Name two metals which can, however, liberate hydrogen gas from very dilute nitric acid.

(a) The volumes of gases A, B, C and D, are in the ratio, 1 : 2 : 2 : 4 under the same conditions of temperature and pressure.

(i) Which sample of gas contains the maximum number of molecules?

(ii) If the temperature and the pressure of gas A are kept constant then what will happen to the volume of A when the number of molecules is doubled?

(iii) If this ratio of gas volumes refer to the reactants and products of a reaction, which gas law is being observed?

(iv) If the volume of A is actually 5.6 dm³ at STP, calculate the number of molecules in the actual volume of D at STP.

(Avogadro's number is 6 × 10²³).

(v) Using your answer from (iv), state the mass of D if the gas is dinitrogen oxide (N₂O).

(N = 14; O = 16)

(b) Calculate the percentage of nitrogen in aluminium nitride. (Al = 27, N = 14)

In Carius method of estimation of halogens, 250 mg of an organic compound gave 141 mg of AgBr. The percentage of bromine in the compound is (At. Mass Ag = 108; Br = 80)

Atomic number of Ag is 47. In the same group the atomic number of elements placed above and below Ag will be

Prove the following:

(a) Oxygen is a diatomic molecule.

(b) 2 × V.D. = Molecular mass.

(c) One mole of any gas contains the same number of molecules.

In the formation of a compound $X{Y}_{2-}$ atom X gives one electron to each Y atom. What is the nature of bond in $X{Y}_2$? Give two properties Of $X{Y}_2$.