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Choose the correct answer from the options given below:

Aqua regia is a mixture of:

(a) dilute hydrochloric acid and concentrated nitric acid

(b) Concentrated hydrochloric acid and dilute nitric acid

(c) Concentrated hydrochloric acid [1 part] and concentrated nitric acid [3 parts]

(d) Concentrated hydrochloric acid [3 parts] and concentrated nitric acid [1 part]

What is Lewis Acid and Lewis Base?

Potassium nitrate on strong heating decomposes as under:

2KNO₃ $\stackrel{∆}{\to }$ 2KNO₂ + O₂

Calculate:

(i) weight of potassium nitrite formed.

(ii) weight of oxygen formed when 5.05 g of potassium nitrate decomposes completely.

(K = 39, O = 16, N = 14)

Take finely powdered Zinc and allow it to react with CuSO₄ solution. Then take Zinc granules and carry out the same reaction. Which reaction will take place faster and why?

Why are four C-Cl bonds in $C{Cl}_4$ equivalent ?

Which of the following is TRUE for alkanes?

What can be inferred from the following equation?

$N{a}_{2}S{O}_4\left(aq\right)+BaC{l}_2\left(aq\right)\to BaS{O}_4\left(s\right)+2NaCl\left(aq\right)$

(i) It is a double displacement reaction.

(ii) It is a precipitation reaction.

(iii) It is a decomposition reaction.

(iv) $BaS{O}_4$ is soluble in water

(v) $BaS{O}_4$ is precipitate.

(vi) $NaCl$ dissolves in water.

Match the following stages of contact process to the products formed.

Burning of fossils fuels causes air pollution because they release on combustion.

Incomplete combustion of methane forms –

The density of a liquid (mol. wt. = 70) is 1.2 g $m{L}^{-1}$. If 2 mL of liquid contains 35 drops, the number of molecules of liquid in one drop are :

Question 28

Soil erosion can be prevented by:



(a) raising forests

(b) deforestation

(c) excessive use of fertilizer

(d) overgrazing by animals

For a silver- magnesium voltaic cell,

calculate the maximum useful work that can be obtained by operating the cell.

$M{g}^{2+}+2e^{-}\to Mg\left(s\right);E^0=-2.37V$

$A{g}^{+}\left(aq\right)+e^{-}\to Ag\left(s\right);E^0=+0.80V$

Zinc oxide reacts with 'y' to give sodium zincate and water. Then 'y' is:

Potassium oxide when reacted with water results in the formation of the same product as formed by potassium on reaction with water. Name the product formed.

In a laboratory, a 3.542 L solution is prepared and given to each student in a class for the practical exam in a fully-filled test tube, as shown in the figure. (Use π = ²²/₇)

How many students get the solution for the practical exam?

Question 1:

What are natural acids?

What is the difference between :

(a) an alkali and a base,

(b) the chemical nature of an aqueous solution of HCI and an aqueous solution of $N{H}_3$

In the food chain comprising of a snake, grass, insect, and frog, the secondary consumer is :

(a) insect (b) snake (c) frog (d) grass

Give the formula and names of A,B,C and D in the following equations:
(a) $C{H}_4\underset{-HCl}{\overset{C{l}_2}{\to }}A\underset{-HCl}{\overset{C{l}_2}{\to }}B\underset{-HCl}{\overset{C{l}_2}{\to }}C\underset{-HCl}{\overset{C{l}_2}{\to }}D$
(b) $C_2{H}_2\stackrel{H_2}{\to }A\stackrel{H_2}{\to }B\underset{-HBr}{\overset{B{r}_2}{\to }}C\underset{-HBr}{\overset{B{r}_2}{\to }}D$
(c)$C_2{H}_4+B\underset{Ni}{\overset{{200}^{\circ }C}{\to }}{C}_2{H}_6$

What are biomedical wastes?

Write the name and chemical formula of the simplest organic acid.

Convert :
(a) Methane into chloroform,
(b) Sodium acetate into methane,
(c) Methyl iodide into ethane,
(d) Aluminium carbide into methane.

The atomic numbers of the three elements X, Y and Z are 2, 6 and 10 respectively.

(i) Which two elements belong to the same group?

(ii) Which two elements belong to the same period?

Give reasons for your choice.

Give some importance of homologous series.

The outer electron configuration of $Gd$. (Atomic number $64$):

The electron affinity values for the halogens shown the following trend -

What would you see, when a crystal of CuSO₄.5H₂O is placed in concentrated sulphuric acid? Give reason to explain your observation.

What happens during the electrolysis of sodium chloride? explain in detail.

Which of the following is not a polymer?

What will be the mass of carbon dioxide made from ${}_6^{14}\text{C}$?