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On moving down in a particular group of modern periodic table the number of valence electrons in the elements______.

Define or explain the terms:
(a) Vapour density,

(b) Molar volume,
(c) relative atomic mass,

(d) relative molecular mass,
(e) Avogadro's number,

(f) Gram atom,
(g) Mole.

Which among the following can form linkage isomer?

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 cathode.

Name the functional group of the product formed when ethanol reacts with ethanoic acid.

State the use of:

(a) Cast Iron, (b) Wrought Iron,

(c) Mild steel, (d) Hard steel.

in which step of the industrial preparation of sulphuric acid, is a catalyst used?

ASSERTION: n-Pentane and n-Hexane belong to a homologous series.

REASON: n-Pentane and n-Hexane belong to the same class of hydrocarbons and they differ by a - $C{H}_2$ - group.

Write the molecular formula of the $2^{n}d$ and $3nd$ member of the homologous series whose first member is methane.

Solid calcium oxide was taken in a container and water was added slowly to it
(i) State two observations made in the experiment.
(ii) Write the name of the chemical formula of the product.

A given amount of gas A is confined in a chamber of constant volume. When the champber is immersed in a bath of melting ice, the pressure of the gas is 100 cm Hg.
(a) What is the temperature, when the pressure is 10 cm Hg?
(b) What will be the pressure, when the chamber is brought to ${10}^{\circ }C.$

A common metal which is highly resistant to corrosion is:
(a) iron (b) cuprite (c) pyrolusite (d) haematite

Chloropicrin is obtained by the reaction of

When a mixtuze of gases X and Y is compressed to 300 atm pressure and then passed over a catalyst consisting of a mixture of zine oxide and chromium oxide (heated to a temperature of ${300}^{o}C$), then an organic compound Z having the molecular formula $C{H}_{4}O$ is formed. X is a highly poisonous gas which is formed in appreciable amounts when a fuel burs in a limited supply of air ; Y is a gas which can be made by the action of a dilute acid on an acitve metal ; and Z is a liquid organic compound which can react with sodium metal to produce hydrogen gas.

(a) What are X,Y and Z ?

(b) Write a balanced chemical equation of the reaction which takes place when X and Y combine to form Z. Indicate the conditions under which the reation occurs.

Define neutralization reaction. Give three applications of neutralization reactions.

L,M and O are in partnership. Their Balance Sheet as on 1-1-2015 was of follows:

BALANCE SHEET
as on 1-1-2015
$\begin{array}{ccccc}\text{Liabilities}& \text{Amount}& \text{Assets}& & \text{Amount}\\ & \text{(Rs)}& & & \text{(Rs)}\\ \text{Creditors}& 25,000& \text{Debtors}& 46,000& \\ \text{Provident Fund}& 10,000& \text{(-) Provision}& \underset{–}{4,000}& 42,000\\ \text{Workmen Compensation Reserve}& 7,000& \text{Building}& & 1,00,000\\ \text{Capital}:L& 2,00,000& \text{Plant}& & 50,000\\ M& 1,50,000& \text{Goodwill}& & 25,000\\ O& 1,50,000& \text{Investments}& & 75,000\\ & & \text{Machinery}& & 2,00,000\\ & & \text{Furniture}& & 50,000\\ & \overline{5,42,000}& & & \overline{5,42,000}\end{array}$

On the above date it was decided to dissolve the firm. Find out the missing figures.

REALISATION ACCOUNT
$\begin{array}{ccccc}\text{Particulars}& \text{Amount}& \text{Particulars}& & \text{Amount}\\ & \text{(Rs)}& & & \text{(Rs)}\\ \text{To Debtors}& ....& \text{By}& & ...\\ \text{To Building}& 1,00,000& \text{By}& & ...\\ \text{To Plant}& 50,000& \text{By}& & ...\\ \text{To Goodwill}& 25,000& \text{By}& & ...\\ \text{To Investments}& 75,000& \text{By Bank A/c (Assets realised):}& & \\ \text{To Machinery}& 2,00,000& \text{Debtors}& 40,000& \\ \text{To Furniture}& 50,000& \text{Building}& ....& \\ \text{To Bank (Creditors)}& ...& \text{Plant}& 50,000& \\ \text{To Bank (Provident Fund)}& \overline{}& \text{Investment}& \underset{–}{30,000}& ....\\ \text{To Bank (Realisation Expenses)}& 1,000& \text{By L's Capital A/c}& & 3,000\\ \text{To ......}& .....& \text{(typewriter taken over)}& & \\ & & \text{By O's Capital A/c}& & 1,47,000\\ & & \text{(Machinery taken over)}& & \\ & & \text{By loss A/c}& & ....\\ & \overline{5,86,000}& & & \overline{5,86,000}\end{array}$

PARTNER'S CAPITAL ACCOUNT
$\begin{array}{cccccccc}\text{Particulars}& L& M& O& \text{Particulars}& L& M& O\\ \text{To Realisation A/c}& -& -& -& \text{By Balance b/d}& 2,00,000& 1,50,000& 1,50,000\\ \text{To....}& -& -& -& \text{By Balance A/c}& -& -& -\\ \text{To Bank A/c}& & & & & & & \\ \text{(Final Payment)}& & & & & & & \\ \text{Total}& -& -& -& \text{Total}& -& -& -\end{array}$

BANK ACCOUNT
$\begin{array}{cccc}\text{Particulars}& \text{Amount}& \text{Particulars}& \text{Amount}\\ & \text{(Rs)}& & \text{(Rs)}\\ \text{To Realisation A/c (Assets Realised)}& 2,40,000& \text{By Realisation A/c (Creditors)}& 24,000\\ \text{To ...............}& .......& \text{By Realisation A/c}& 10,000\\ & & \text{(Provident Fund)}& \\ & & \text{By Realisation A/c}& 5,000\\ & & \text{(Workmen Compensation)}& \\ & & \text{By Realisation A/c}& 1,000\\ & & \text{(Realisation Expenses)}& \\ & & \text{By.........}& ......\\ & & \text{By.........}& ......\\ \text{Total}& ......& \text{Total}& .....\end{array}$

Chloroflurocarbons are mainly produced by ________________.

(a) State one advantage of using jute bags over plastic bags for shopping. (b) Write a common food chain of a pond ecosystem having four links.

How do we taste acidic nature of acetic acid $\left(C{H}_{3}COOH\right)$?

Lab assistant has the solution of 50% acid and other which has 25% acid how much of each should be mixed to make 10 litres of 40% solution

What is chor alkali process called ?

When an alpha particle gains two electrons it becomes a neutral atom of an element which is a rare gas. Name of this rare gas is

Chemical barriers in human include_______.

Extraction of which metal from their ores require carbon? Name all of them.

What role does stirring play in combustion?

First, second and third I.P. values are 100 eV, 150 eV and 1500 eV. Element can be

If copper is kept open in air, it slowly loses its shining brown surface and gains a green coating. It is due to the formation of _____.

Which of the following element has 3 shells and have 4 electrons in the outermost shell?

Which one of the following has the highest electronegativity?

Question 41
In electron dot structure, the valence shell electrons are represented by crosses or dots
(a) The atomic number is 17. Write its electronic configuration.
(b) Draw the electron dot structure of chlorine molecule.

Which acid is present in soft drinks? Ascorbic acid or carbonic acid?

While performing an experiment Vikas found that the metal is not reacting with water. Which metal is it?

How do we get a balanced equation for a photosynthesis reaction?

Balance

NaCl + H2O =NaOH + H2O + Cl2

what is exothermic reaction an one example

The shape of ammonia molecule is

What are the products formed when ammonia is oxidized with copper oxide?

Give a chemical test to distinguish between the following :

(a) Ammonium chloride and sodium chloride,

(b) Ferric salt and ferrous salt,

(c) Sodium sulphate and ammonium sulphate.

Give reasons, why aluminum is used in :

(a) making alloys,

(b) Wrapping chocolates,

(c) Painting electric and telegraphic poles,

(d) In aluminiothermy,

(e) In making ships.

What is heterotrophic mode of nutrition? Give two examples of heterotrophs. [2 MARKS]

Complete the following esterification reaction:
${\mathrm{CH}}_3\mathrm{COOH}+{\mathrm{CH}}_3{\mathrm{CH}}_2\mathrm{OH}\stackrel{H_2{\mathrm{SO}}_4}{\to }$+$H_{2}O$

Formation of chemical bond is accompanied by __________.