Explore topic-wise InterviewSolutions in .

Which of the following is a non-metal?

Which of the following substances has free electrons to conduct electricity?

What can a universal indicator indicate?
(i) Whether a solution is acidic.
(ii) Whether a solution is basic.
(iii) The pH of the solution.
(iv) Whether a base is strong or weak.
(v) Whether an acid is strong or weak.

Which of the following are examples of chemical reactions?

i. Burning wood

ii. Cutting wood

iii. Conversion of steam to water

iv. Rusting of almirah

v. Dissolving common salt in water

Salman and Amir were partners in a firm sharing profit in the ratio of 2 : 3. On 31st March, 2011, their Balance Sheet was as follows:
BALANCE SHEET
as on 31st March, 2011
$\begin{array}{ccccc}\text{Liabilities}& & \text{Amount}& \text{Assets}& \text{Amount}\\ & & \text{(Rs)}& & \text{(Rs)}\\ \text{Capitals:}& & & \text{Land and Building}& 3,00,000\\ \text{Salman}& 2,00,000& & \text{Stock}& 1,00,000\\ \text{Amir}& \underset{–}{3,00,000}& 5,00,000& \text{Debtors}& 1,50,000\\ \text{Creditors}& & 1,05,000& \text{Bank}& 1,55,000\\ \text{Workmen Compensation Fund}& & 1,00,000& & \\ & & \overline{7,05,000}& & \overline{7,05,000}\end{array}$

The firm was dissolved on 1-4-2011 and the Assets and Liabilities were settled as follows:

(i) Salman agreed to take over Land and Building at Rs 3,50,000 by paying cash.

(ii) Stock was sold for Rs 90,000.

(iii) Creditors accepted debtors in full settlement of their claim.

Pass necessary Journal entries for dissolution of the firm.

At constant pressure, the volume of the fixed mass of an ideal gas is directly proportional to

Sulphuric acid acts as the ___ in lead accumulators.

A food chain consists of fish, larvae, phytoplankton and birds. The level of pesticides in water in which the fish, larva and phytoplanktons live is quite high.

(a) In which organisms the pesticides enter from the polluted water? What is this level of organisms known as?

(b) Which organism will have the maximum amount of pesticides accumulated through the food chain?

(c) Write the food chain comprising all the organisms mentioned above.

(d) Which other organisms you could write in place of a bird in the above food chain?

Which category of organisms forms the starting point of a food chain?

Give the common name and IUPAC name of $C_2{H}_{5}OH$.

Some stale food gives a bad taste and a bad smell because of:

(a) A to F below relate to the source and extraction of either zinc or aluminium:

A.Bauxite, B.Coke,

C. Cryolite D.Froth floatation, E.Sodium hydroxide solution, F.Zinc blende.

(i) Write down the three letters each from the above list which are relevant to:

1.Zinc, 2.Aluminium.

(ii) Fill in the blanks using the most appropriate words form A to F.

1.The ore from which aluminium is extracted must first be treated with ...................so that pure aluminium oxide can be obtained.

2.Pure aluminium oxide is dissolved in .............. to make a conducting solution.
(iii) Write the formula of cryolite.

Identify the correct dot structure of $O_2$ molecule?

Concentrated sulphuric acid is a :

When lead reacts with NaOH, a colourless salt X is formed along with hydrogen gas. Name the salt X.

The salt which in solution gives a pale green precipitate with sodium hydroxide solution and a white precipitate with barium chloride solution is:

Why do metals have large atomic radii as compared to non metals?

Ammonia occurs in ___.

Ammonia is oxidized according to the following equation:
$4N{H}_3+5O_2\to 4NO+6H_{2}O$
​How many litres of nitric oxide are formed when 90 litres of oxygen reacts with ammonia? If 4 volume of ammonia reacts with 5 volume of oxygen to give 4 volume of nitric oxide.

A V ${dm}^3$ flask contains gas A and another flask of 2V ${dm}^3$ contains gas B at the same temperature. If density of gas A is 3.0 g ${dm}^{-3}$and of gas B is 1.5 g ${dm}^{-3}$ and mol. Wt. Of A = $\frac{1}{2}$mol. Wt. Of B, then the ratio of pressure exerted by gases is

Among lanthanoid la^{​​​​​la3+} & lu^{​​​​​3+} ions are

A)paramagnetic B)Diamagnetic C) ferromagnetic

D)All of these

Please with explaination

Which one of the following compounds undergoes Dehydrohalogenation to the maximum extent?

The bond angle in ethylene is

Aqueous solution of lead and zinc nitrate can be distinguished using an aqueous solution of ammonia. Give reasons.

What is reduction and oxidation ?

(a) How can diamonds be made artificially? How do synthetic diamonds differ from the natural one?
(b) Give any two differences between the properties of diamond and graphite. What causes these differences?

Samples of gases O₂, N₂, CO, and CO under the same conditions of temperature and pressure contain the same number of molecules represented by X. The molecules of oxygen (O₂) occupy V litres and have a mass of 8 g. Under the same conditions of temperature and pressure:

What is the mass of CO₂ in grams?

Which of the following terms involves the determination of chemical components present in a given sample?

The atomic numbers of three elements A, B and C are 3, 9 and 11 respectively. State which of the two elements will exhibit similar chemical properties.

What happens when (Give equations of the chemical reaction)
(i) A pinch of sodium hydrogencarbonate is added to ethanoic acid.
(ii) Ethanol is oxidised with acidified potassium dichromate.

Name two metals which are highly resistant to corrosion .

What is the oxidizing agent in the following redox reaction?

$Zn\left(s\right)+C{u}^{2+}\left(aq\right)\to Z{n}^{2+}\left(aq\right)+Cu\left(s\right)$

An element X belongs to 3^rd period and group 2 of the periodic table. State :

(a) number of valence electrons (b) valency (c) metal or non-metal (d) name of the element

Correct the statements if required.
(a) One mole of chlorine contains $6.023\times {10}^{23}$ atoms of chlorine,
(B) Under similar conditions of temperature and pressure, two volumes of hydrogen combined with two volumes of oxygen will give two volumes of water vapour,
(c) Relative atomic mass of an element is the number of times one molecule of an element is heavier than $\frac{1}{12}$ the mass of an atom of carbon $\left[C^{12}\right]$
(d) Under the same conditions of the temperature and pressure, equal volumes of all gases contain the same number of atoms.

Choose the correct answer :

(a) The nitrate salt which does not give a mixture of $N{O}_2$ and $O_2$ on heating is :

(i) $AgN{O}_3$, (ii) $KN{O}_3$,

(iii) $Cu(N{O}_3{)}_3$, (iv) $Zn(N{O}_3{)}_2$.

(b) The chemical used in the brown ring test is :

(i) $CuS{O}_4$, (ii) $FeS{O}_4$

(iii) $F{e}_2(S{O}_4{)}_3$ (iv) $ZnS{O}_4$.

(c) Lead nitrate decomposes on heating to give :

(i) NO, (ii) $N_{2}O,$

(iii) $N{O}_2$ (iv) $N_2{O}_5$.

What is the importance of pH?

A and B share profits in the proportions of $\frac{3}{4}$ and $\frac{1}{4}$. Their balance sheet on Dec 31, 2016 was as follows.

$\text{Balance Sheet of A and B}$
$\text{as on December 31, 2006}$
$\begin{array}{cccc}\text{Capital and Liabilities}& \text{Amt. (Rs)}& \text{Assets}& \text{Amt. (Rs)}\\ \text{Sundry Creditors}& 41,500& \text{Cash at Bank}& 26,500\\ \text{Reserve Fund}& 4,000& \text{Bills receivable}& 3,000\\ \text{Capital Accounts}& & \text{Debtors}& 16,000\\ \text{A}& 30,000& \text{Stock}& 20,000\\ \text{B}& 16,000& \text{Fixtures}& 1,000\\ & & \text{Land and Building}& 25,000\\ & \overline{\underset{–}{91,500}}& & \overline{\underset{–}{91,500}}\end{array}$

On Jan 1, 2007, C was admitted into partnership on the following terms

(a) That C pays Rs. 10.000 as his capital.

(b) That C pays Rs 5,000 for goodwill. Half of this sum is to be withdrawn by A and B.

(c) That stock and fixtures be reduced, by 10% and 5%, provision for doubtful debts be created on sundry debtors and bills receivable.

(d) That the value of land and building be appreciated by 20%.

(e) There being a claim against the firm for damages, a liability to the extent of Rs. 1,000 should be created.

(f) An item of Rs. 650 included in sundry creditors is not likely to be claimed and hence, should be written back.

Record the above transactions (journal entries) in the books of the firm assuming that the profit sharing ratio between A and B has not changed. Prepare the new balance sheet on the admission of C.

Identify the ester compound in the options given below.

An emf of $16V$ is induced in a coil having inductance $4H$, if current in coil is $2A$ (at that moment), then the rate of change of energy stored in solenoid

(a) What is meant by a substitution reaction? Give an example (with equation) of the substitution reaction of an alkane.
(b) How is soap made? Write a word equation involved in soap making.

Give reason for the following :
Silver, gold and platinum are used to make jewelery.

(a) What is a homologous series ? Explain with an example.
(b) State two characteristics of a homologous series.
(c) The molecular formula of an organic compound is $C_{18}{H}_{36}.$ Name its homologous series.
(d) Select the hydrocarbons which belong to the same homologous series. Give the name of each series.
$C{H}_4,C_2{H}_2,C_2{H}_4,C_2{H}_6,C_4{H}_{10},C_3{H}_4,C_3{H}_6$
(e) What is meant by 'heteroatom'? Give examples. Write the names and formulae of two organic compounds containing different heteroatoms.

Write : (a) molecular formula, (b) electron dot formula and (c) structural formula of ethene (ethylene).