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The presence of which atom makes the given functional group easy to oxidise?

The purity of pure gold in carat is:

Define the term 'metallurgy'. State the processes involved in metallurgy.

How would the tendency to gain electrons change on moving from left to right in a period of the periodic table?

Two non-metals combine with each other by the sharing of electrons to form a compound X.
(a) What type of chemical bond is present in X?
(b) State whether X will have a high melting point or low melting point.
(c) Will it be a good conductor of electricity or not?
(d) Will it dissolve in an organic solvent or not?

Which of the following is not a halo compound?

A black metal oxide $X{O}_2$ is used as a catalyst in the preparation of oxygen gas from potassium chlorate. The oxide $X{O}_2$ is also used in ordinary dry cells. The metal oxide $X{O}_2$ cannot be reduced satisfactorily with carbon to form meteal X.
(a) Name the metal X.
(b) Name the metal oxide $X{O}_2$
(c) Which reducing agent can be used to reduce $X{O}_2$ to obtain metal X?
(d) Name another metal which can also be extracted by the reduction of its oxide with the above reducing agent.

HCI, HN$O_3,C_2{H}_{5}OH,C_6,H_{12}{O}_6$ all contain H atoms but only HCI and $HN{O}_3$ show acidic character. Why ?

Name two predators of snakes in a food web operating in a forest ecosystem.

Which of the following give two acids as products?

Ammonia gas is produced when solid Ammonium Chloride is heated with

(a) Explain the pH change as the cause of tooth decay. How can we prevent tooth decay caused by pH variations?

(b) Explain how pH change in the lake water can endanger the lives of aquatic animals (like fish). What can be done to lessen the danger to the lives of aquatic animals in the lake?

A salt is dissolved in water and the pH of this salt solution is measured with a universal indicator paper. If the pH of solution is less than 7, the salt is most likely to be :

(a) $C{H}_{3}COONa$

(b) $N{a}_{2}C{O}_3$

(c) $KCl$

(d) $N{H}_{4}Cl$

Number of C–H and C–C single bonds respectively in structure given below are-

What is hydrated and anhydrous salt?

Sir , if we put zinc and aluminium in an electrolyte of NaCl then electricity will generate or not if yes then tell why and not so tell me what is wrong and which metals can I place in replace of it to produce electricity????

Nitric oxide violates the octet rule because __________.

Give reasons for the following observations?
(a) Air holes of a gas burner have to be adjusted when the vessels being heated get blackened by the flame.
(b) Use of synthetic detergents causes pollution of water.

What happens when sodium meta aluminate is diluted with water?

Sulphuric acid forms a constant boiling mixture at 338 degree celcius when at ___ concentration.

Complete the following

$2A{l}_2{O}_3+3C\to 4A+3B$. A & B are as follows.

Washing soda has the formula

An atom X has 2,8,7 electrons in its shells. It combines with Y having 1 electron in its outermost shell. What type of bond will be formed between X and Y?

Write two main difference between the nature of diamond and graphite.

What is the colour of pure sulphuric acid?

Which of the following solution can be stored in aluminium container?

Write the IUPAC names, common names and formulae of the first two members of the homologous series of carboxylic acids.

What is the difference between sodium carbonate and sodium carbonate solution?

is a group of organic chemical compounds, usually listed in order of increasing size, that have a similar structure.

Choose a saturated compound among the following given options:

Is HCl in our concentrated or dillute?

Among the following, ionic compound is formed between:

A)explain all the postulates of Bohr's atomic model.(short points).

B) explain draw backs of Rutherford's model of atom.(short points).

are substances that fasten the rate of the reaction without undergoing any permanent change themselves.

How do we write the IUPAC names of compounds?

Solid ammonium dichromate decomposes as the equationr:

$(N{H}_{4}4{)}_{2}C{r}_2{O}_7\to N_2+C{r}_2{O}_3+4H_{2}O$
If 63 g of sammonium dichromate decomposes, calculate:
(a) the quantity in moles of $(N{H}_4{)}_{2}C{r}_2{O}_7$
(b) the qunatity in moles of nitrogen formed
(c) the volume of $N_2$ evolved at STP

(d) the loss of mass
(e) the mass of chromium (iii) oxide formed at the same time.

As the concentration of reactants increases,the number of molecules per unit volume and the number of effective collisions ___.Consequently, the speed of reaction ___.

The bond which is formed by sharing of an electron pair between two atoms is known as:

Give use of (i) helium gas (ii) neon gas.

(a) State the merits of Mendeleev’s classification of elements

(b) Describe two anomalies of Mendeleev’s periodic classification of elements.