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What happens in a magnet at the atomic level which makes it a magnet?

Study the flow chart and give balanced equations with conditions for the conversions A, B, C, D and E.

(a) Name two metals which resist corrosion due to the formation of a thin, hard and impervious layer of oxide on their surface.
(b) Name five methods of preventing rusting of iron.
(c) What are the constituents of stainless steel? What are the special properties of stainless steel?

Ammonia is a base but doesn't contain a hydroxyl group.

An alkene 'X' of the formula $C_4{H}_8$ on ozonolysis produced acetone and formaldehyde. The product obtained when 'X' reacts with HBr is

The representation of rate of reaction in terms of concentration of the reactants is known as

An electrolytic cell is set up using two platinum electrodes and an aqueous solution of copper (II) sulphate given below:

Name the ion discharged at the anode.

The energy required to remove an electron from an isolated gaseous atom is called __.

The general formula of alkynes is:

What do we understand by ionisation potential

The chemical equations are balanced to satisfy one of the following laws in chemical reactions. This law known as :

(a) law of conservation of momentum

(b) law of conservation of mass

(c) law of conservation of motion

(d) law of conservation of magnetism

The valency of the element having electronic configuration 2,8,8,1 is –

Give 10 examples of strong acids and weak acids?

Name the hydrocarbon which :
(a)is a tetrahedral molecule,
(b)is a planar molecule,
(c)is a linear molecule,
(d)forms a red precipitate with ammoniacal solution of copper (I) chloride,
(e) is known as paraffin,
(f) is known as olefin.
(g) a compound which will give acetylene (ethyne) gas when treated with water.

If 112 cm³ of hydrogen sulphide is mixed with 120 cm³ of chlorine at STP, what mass of sulphur is formed?

What is meant by the term functional group?

Acidified water was electrolysed using an inert electrode. The volume of gases liberated at STP was 168 ml. The amount of charge passed through the acidified water was: (in coloumb)

An element X combines with oxygen to form an oxide XO. This oxide is electrically conducting.

(a) How many electrons would be there in the outermost shell of the element X?

(b) To which group of the periodic table does the element X belong?

(c) Write the formula of the compound formed when X reacts with chlorine.

(a) Select the correct answer

The aqueous solution of the compound which contains both ions and molecules is

A. $H_{2}S{O}_4$

B. $HCl$

C. $HN{O}_3$

D. $C{H}_{3}COOH$

(b) Correct the following statement ___.

Lead bromide conducts electricity.

(c) A metal article is to be electroplated with silver. The electrolyte selected is sodium argentocyanide

(i) What kind of salt sodium argentocyanide ?

(ii) Why is it preferred to silver nitrate as an electrolyte ?

(iii) State one condition to ensure that the deposit is smooth, firm and long lasting.

(iv) Write the reaction taking place at the cathode.

(v) Write the reaction taking place at the anode.

(d) Aqueous solution of nickel sulphate contains $N{i}^{2+}$ and $S{O}_4^{2-}$ ions.

(i) Which ion moves towards the cathode ?

(ii) What is the product at the anode ?

Which metal becomes black in the presence of hydrogen sulphide gas in air?

$KMn{O}_4$ will oxidize acetylene to

What are metalloids?

Please answer with description.

The hydrocarbon which is used for the artificial ripening of fruits has "x" carbon atoms. The main component of LPG is a hydrocarbon with "y" number of carbon atoms. Among the following hydrocarbons identify the alkyne which has "x + y" carbon atoms.

In Hall Heroult's process, if the weight of fused alumina used in the electrolyte is 200 g then what amounts of cryolite and fluorspar are respectively used?

The correct order of decreasing polarizability of ion is _____.

Which of the following is the correct molecular formula of Nitric acid?

If I have been provided with 3 test tubes one of them contains disstiled water and the other two contains acidic and basic solutions respectively. If I was given only red litmus paper, how will I know the contents of the test tubes?

A solution containing a large amount of solute is known as __.

Which of the following statement(s) is/are correct about carbon compounds?

(i) Carbon has the ability to form covalent bonds with other atoms of carbon giving rise to a large number of molecules through a self-linking property.

(ii) Carbon compounds do not show isomerism.

(iii) Carbon compounds are highly unstable compounds.

(iv) Carbon compounds have low melting and boiling points.

how is number of atom is decided to written in a eqation ?like hydrogen sulphate as H_{​​​​​​2}​​​SO_​​​4 not HSO_{​​​​ 4} or H2_{​​​​​H2SO3}

Which type of compound is formed by the reaction of an alcohol with carboxylic acid?

Raghav was having 3 metal pieces. He threw all the three pieces one by one in the lake. He then made a table of his observation

Identify metal A.

A metal salt MX when exposed to light splits up to form metal M and a gas X_2. Metal M is used in making ornaments whereas gas X₂ is used in making bleaching powder. The salt MX is itself used in black-and-white photography.

(a) What do you think metal M is?

(b) What could be gas X₂?

(c) Name the metal salt MX.

(d) Name any two salt solutions which on mixing together can produce a precipitate of salt MX.

(e) What type of chemical reaction takes place when salt MX is exposed to light? Write the equation of the reaction.

Which of the following statements is correct?

The gas released when conc. sulphuric acid reacts with formic acid is :

What would you observe when :

(a) blue litmus is introduced into a solution of hydrogen chloride gas,

(b) red litmus paper is introduced into a solution of ammonia in water,

(c) red litmus paper is introduced in caustic soda solution ?

What property of conc. $H_{2}S{O}_4$ is made use of in each of the following cases ? Give an equation for the reaction in each case :

(a) in the production of HCI gas when it reacts with a chloride,

(b) in the preparation of CO from HCOOH,

(c) as a source of hydrogen by diluting it ans adding a strip of magnesium,

(d) in the preparation of sulphuric acid by warming a mixture of conc.sulphuric acid and copper-turnings,

(e) hydrogen sulphide gas is passed through concentrated sulphuric acid.

What will be the structure of micelles if soap is dissolved in a hydrocarbon?

(a) Here is an electrode reaction :

$Cu\to C{u}^{2+}+2e^{-}$. At which electrode (anode or cathode) would such a reaction take place? Is this an example of oxidation or reduction ?

(b) A solution contains magnesium ions $\left(M{g}^{2+}\right)$, iron (II) ions $F{e}^{2+}$ and copper ions $C{u}^{2+}$. On passing an electric current through this solution, which ions will be the first to be discharged at the cathode? Write the equation for the cathode reaction.

(c) Why is carbon tetrachloride, which is a liquid, a non-electrolyte ?

(d) During the electrolysis of molten lead bromide, which of the following takes place ?

A. Bromine is released at the cathode,

B. Lead is deposited at the anode,

C. Bromine ions gain electrons,

D. Lead is deposited at the cathode.

lead reacts with oxygen. which ion should we take for lead? pb+1 or pb+2 or pb+4....

In order to prevent the spoilage of potato chips, they are packed in plastic bags in an atmosphere of :

(a) $C{l}_2$ (b) $H_2$ (c) $N_2$ (d) $O_2$