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Which of the following compounds will undergo an addition reaction?

A number of elements are available in earth’s crust but most abundantly available elements are ____.

The total weight of ${10}^{22}$ molecular units of $CuS{O}_{4}5H_{2}O$ is nearly

Construct a food chain comprising the following: Snakes, Hawk, Rats, Plants

The decomposers in an ecosystem

The electronegativity of the following elements increase in order:

Zn + HNO3 ------ Zn(NO3)2 + NO2 + H2O please balance this in method which you have thought . But not in trail method

If a solution X has a pH value of 2 and if another solution Y has a pH value of 1. Then compare the hydrogen ion concentration between them.

Metallic character ___ down a group in a periodic table.

Find the number of atoms in 62 g of phosphorous if its gram atomic mass is 31 g.

write a detailed note on stomach.

Ammonium dichromate on heating leaves greenish grey mass X. What is X?

Classify the following as biotic and abiotic components:
Rain fall, a rose plant, soil, fish, earthworm, fertilizers, temperature, bacteria.

On analysis, a substamnce was found to contain;
C = 54. 54% H= 9.09 % O = 36.36 %
The vapour density fo the substance is 44, calculate:
(a) its empirical formula, (b) its molecular formula.

The pH values of five solutions A, B, C, D and E are given below :

A 1

B 5

C 7

D 11

E 13

Which solution is (i) weakly alkaline (ii) neutral (iii) strongly acidic (iv) strongly alkaline, and (v) weakly acidic ?

Write structural formulae of the following compounds.
(i) Ethyl alcohol (ii) Acetaldehyde (iii) Propionic acid

State the main characteristics of chemical reactions. Give at least one example in each case.

Which among the following statement is incorrect?

Sodium hydroxide and ammonium hydroxide are used in analytical chemistry for identifying __ [acidic/basic] radicals.

Calculate the percentage composition of :
potassium chlorate, $KCl{O}_3$

Give the preparation of the salt shown in the left column by matching with the methods given in the right column.

Write a balanced equation for each preparation.

Salt Method of preparation

Zinc sulphate Precipitation

Ferrous sulphide Oxidation

Barium sulphate Displacement

Ferric sulphate Neutralisation

Sodium sulphate Synthesis.

Why does ethyne (acetylene) burn with a sooty flame?

What happens when ethylene bromide is boiled with alcoholic potassium hydroxide?

(a) The relative atomic mass of CL atom is 35.5 a.m.u8. Explain this statement.
(b) What is th value fo Avogadro's number?
(c) What is the value of molar volume fo a gas at S.T.P.?

Which of the following elements would form oxides which would indicate pH values less than seven, using moist pH paper ?

Magnesium, Carbon, Sulphur, Hydrogen, Copper

Explain with reasons:

(a) In the electrolytic reduction of alumina, the graphite anode is gradually consumed.

or

Why the anode has to be replaced in this process?

(b) Roasting is carried out on sulphide ores and not on carbonate ores.

(c) Carbon can reduce lead oxide but not aluminium oxide.

(d) Electrolytic reduction is done to obtain aluminium?

(e) Why 'the food containing iron salts' should not be cooked in aluminium utensils?

The atomic radius in case of inert gasses is ___.

Give any two uses of common salt (sodium chloride).

Lead is unaffected by water because:

For phenolphthalein $p{K}_{in}$ = 9.7. The indicator can be used for the pH range of 8.2 to 10. Calculate the $\frac{\left[I{n}^{-}\right]}{\left[HIn\right]}$ for the upper and lower limits of the range.

When the solution of substance X is added to a solution of potassium iodide, then a yellow solid separates out from the solution.

(a) What do you think substance X is likely to be ?

(b) Name the substance which the yellow solid consists of.

(c) Which characteristic of chemical reactions is illustrated by this example ?
(d) Write a balance chemical equation for the reaction which takes place. Mention the physical states of all the reactants adn products involved in the chemical equatio.

The formation of ammonia is promoted by the use of __(high/low) pressure.

Mg ribbon on burning gives MgO. Which are the oxides and hydroxides of s block elements available in you science lab

Find the nature of NaOH and KOH by conclusion litmus test and record your conclusion

(a) What happens when ethanol reacts with ethanoic acid in the presence of a little of concentrated sulphuric acid? Write an equation of the reaction involved.
(b) What happens when ethanol is heated with concentrated sulphuric acid at ${170}^{\circ }C$? Write the equation of the reaction which takes place.

Which inert gas electron configuration do the Cl atoms in $C{l}_2$ molecule resemble? What is the electron configuration?

Fats + NaOH → ........+ Glycerol. Name the other product formed in this reaction is:

An ore on being heated in air forms sulphurous anhydrate. Write the process used for the concentration of this ore.

A hydrocarbon is

Acids dissolve most metals, which special mixture of acids is used to dissolve gold?

Match the following

$\begin{array}{cccc}& \text{Cation}& & \text{Colour}\\ \text{A)}& C{u}^{2+}& \text{a)}& \text{Pink}\\ \text{B)}& C{r}^{3+}& \text{b)}& \text{Brown}\\ \text{C)}& M{n}^{2+}& \text{c)}& \text{Green}\\ \text{D)}& F{e}^{2+}& \text{d)}& \text{Light Green}\\ \text{E)}& F{e}^{3+}& \text{e)}& \text{Blue green}\end{array}$

Give journal entries for the following transactions

1. To record the realisation of various assets and liabilities.

2. A firm has a stock of Rs. 1,60,000. Aziz, a partner took over 50$\%$ of the Stock at a discount of 20$\%$.

3. Remaining Stock was sold at a profit of 30$\%$ on cost.

4. Land and Building (book value Rs 1,60,000) sold for Rs 3,00,000 through a broker, who charged 2$\%$, commission on the deal.

5. Plant and Machinery (book value Rs 60,000) was handed over to a Creditor at an agreed valuation of 10 $\%$ less than the book value.

6. Investment whose face value was Rs 4,000 was realised at 50$\%$