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Match Column-I with Column-ll and select the correct option from the codes given below.

Column – I Column – ll

A. Nitrosomonas (i) Ammonia to nitrite

B. Nitrobacter (ii) Nitrite to nitrate

C. Pseudomonas (iii) Nitrate to N2

What type of bonds is present in hydrogen chloride and oxygen?

What is the difference between two consecutive homologues :
(i) in terms of molecular mass?
(ii) in terms of number and kind of atoms per molecule?

___ is the property by which an element tends to form chains of identical atoms.

Give reason: Generally, for making gold ornaments, 22-carat gold is preferred over 24-carat gold. [2 MARKS]

In general, electronegativity ___ going left to right across a row in the periodic table.

Why did Mendeleev leave gaps in his periodic table? [2 MARKS]

The melting point of ice on Kelvin scale is :

In one method of rust prevention, the iron is not coated with anything. Which is this method?

Write a balance chemical equation for the following reaction: ammonium hydroxide reacts with sulphuric acid.

Chemical formulas of all the major ores on Earth ?

Do the highly reactive metals participate in refining?

Please explain in detail

Sir in module I have seen that pH of water is 7 that means 1 H3O+ is presented in 10^7 molecules of water but they Have also said that moles/litre .sir how it is moles / litre from ions / mooucumol

The theoretical probability of getting a tail while tossing a coin is __

How denatured alcohol effects a person when they consume this alcohol?

Calculate the weight of a substance X which in gaseous form occupies 10 litres at ${27}^{0}C$ and 700 mm pressure.The molecular weight of X is 60.

In addition to some propane and ethane, LPG cylinders contain mainly two isomers of another alkane. Name the two isomers and write their condensed structural formulae.

What is rust?

(a) Potassium chlorate $\left(KCl{O}_3\right)$ on heating forms potassium chloride and oxygen. Write a balanced equation for this reaction adn indicate the evolution of gas.

(b) Rewrite the following information in the form of a balanced chemical equation :

Magnesium burns in carbon dioxide to form magnesium oxide equation :

How is HCl gas synthesized by direct method?

Why is photosynthesis considered as an endothermic reaction

When the gases sulphur dioxide and hydrogen sulphide mix in the presence of water the reaction is :

SO₂+2H₂S=2H₂O+3S

Here hydrogen sulphide is acting as :

A. Oxidizing agent

B. Reducing agent

The following is a list of methods for the preparation of salts.

A - direct combination of two elements.

B - reaction of a dilute acid with a metal.

C - reaction of a dilute acid with an insoluble base.

D - titration of a dilute acid with a solution of soluble base.

E - reaction of two solutions of salts to form a precipitate.

Choose from the above list A to E, the best method of preparing the following salts by giving a suitable equation in each case :

1. Anhydrous ferric chloride, 2. Lead chloride,

3. Sodium sulphate, 4. Copper sulphate.

What is the equation for the following reaction?

Sulphur and hot concentrated nitric acid

What is an ionic compound? Define it and give examples.

Complete the following food chain by writing the names of appropriate organisms in the blanks.

(i) Grass $\to$ ................. $\to$ Snake $\to$ .............

(ii) ............... $\to$ Mouse ..............$\to$ Peacock

Which of the following gas is evolved when sodium bisulphite reacts with sulphuric acid?

Which form of medicine is preferred in fever: tablet or powdered form?

What type of bonds are present in methane $\left(C{H}_4\right)$ and sodium chloride $\left(NaCl\right)$

Dodecane in presence of platinum gives a mixture of:

When the aqueous solution of $L{i}_{2}S{O}_4$ electrolyzed the products formed at cathode and anode respectively are

The colors of aqueous solutions of $CuS{O}_4$ and $FeS{O}_4$ as observed in the laboratory are:

If two atoms share only 2 electrons. Then what bond is formed?

Find out the amount of bills matured during the year on the basis of information given below

$\begin{array}{cc}& \text{(Rs.)}\\ \text{Bills payable dishonoured}& 37,000\\ \text{Closing balance of Bills payable}& 85,000\\ \text{Opening balance of Bills payable}& 70,000\\ \text{Bills payable accepted}& 9,000\\ \text{Cheque dishonoured}& 23,000\end{array}$

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

Using your answer from (d), state the mass of D if the gas is dinitrogen oxide (N₂O). [N = 14, O = 16]

Vicky was performing an experiment on nickel electroplating. He used nickel sulphate as the electrolyte and the cathode was made up of steel. Which type of anode he should use to get satisfactory result in the experiment.

An ion has very high charge and very high lattice energy. What do you think can be the size of this ion?

Which element has four valence electrons?

What type of reactions are represented by the following equations ?

(i) $CaC{O}_3⟶CaO+C{O}_2$

(ii) $CaO+H_{2}O⟶Ca(OH{)}_2$

(iii) $2FeS{O}_4⟶F{e}_2{O}_3+S{O}_2+S{O}_3$

(iv) $N{H}_{4}Cl⟶N{H}_3+HCl$

(v) $2Ca+O_2⟶2CaO$

Rewrite the following statements after correction, if necessary :

(i) Elements in the same period have the equal valency

(ii) The metallic character of elements in a period increases gradually on moving from left to right.