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Give an example of a chemical reaction which is characterised by the evolution of a gas.

The type of medicine used to treat indigestion is

When a copper wire is placed in a solution of AgNO₃, the solution acquires blue colour. This is due to the formation of

Name a reducing agent that may be used to obtain manganese from manganese dioxide.

Out of aluminium, copper calcium and tin, the most reactive metal is :
(a) aluminium (b) copper (c) tin (d) calcium

Name the organic compound present in vinegar. [1 MARK]

Ethylamine can be obtained by the

Raw materials used in the preparation of glass are:

An element 'M' has atomic number 11. [5 MARKS]
1. Write its electronic configuration.
2. State the group to which 'M' belongs.
3. Is 'M' a metal or a non-metal?
4. Write the formula of its chloride.
5. Name at least four elements present in this group.

Which of the following is/are characteristic of gasses?

The least metallic element of group 2 is

The reaction in which chlorine atom replaces hydrogen atom in a molecule of methane is called

Which of the following can you use to get metal from rust:

Which of the following options represent correct decreasing order by which the metals: Na, Au, Cu and Mg will lose their lustre when exposed to air?

(a) What are alcohols? State their sources.

(b) Give general formulae of monohydric alcohol.

X, Y and Z were partners, sharing profits and losses in the ratio of $\frac{1}{2},\frac{3}{8}$, and $\frac{1}{8}$ respectively. On 31st March, 2012, they agreed to dissolve their partnership firm when their position was as follows:

$\begin{array}{cccc}\text{Liabilities}& \text{Rs}& \text{Assets}& \text{Rs}\\ \text{Reserve Fund}& 40,000& \text{Freehold Property}& 1,80,000\\ \text{Loan by X}& 30,000& \text{Machinery}& 1,20,000\\ \text{Creditors}& 80,000& \text{Book Debts}1,60,000& \\ \text{Capitals:}& & \text{Less:Provision}\underset{–}{10,000}& 1,50,000\\ X2,00,000& & \text{Stock}& 1,30,000\\ Y1,50,000& & \text{Cash}& 20,000\\ Z\underset{–}{1,20,000}& 4,70,000& \text{Loan to Z}& 20,000\\ & \underset{–}{\overline{6,20,000}}& & \underset{–}{\overline{6,20,000}}\end{array}$

The assets were realised as follows :

Freehold Property Rs 2,20,000; Machinery Rs 1.10,000; Book Debts 10% less; Stock Rs 1,20,000 and Goodwill Rs 40,000. The creditors were paid off at a discount of 2.5% and expenses of realisation amounted to Rs 5,000. Rent Rs 3,000 was outstanding and had to be paid.

Prepare realisation account.

Noble gases are considered to be inert. Identify a pair of noble gases from the options given below.

The pH of soil A is 7.5 while that of soil B is 4.5. Which of the two soils, A or B, should be treated with powdered chalk to adjust its pH and why ?

'Stability of a crystal is reflected in the magnitude of its melting points', Comment. Collect melting points of solid water, ethyl alcohol, diethyl ether and methane from a data book. What can you say about the intermolecular forces between these molecules?

If a hydrocarbon contains 4 carbon atoms then how many different arrangements of carbon skeletons are possible?

Prepare a Bank Reconciliation Statement on 31 May 2012 for the following:

(1) Cheques issued before May 31, 2012, amounting to Rs. 25,940 had not been presented for encashment.

(2) Two cheques of Rs. 3,900 and Rs. 2,350 were deposited into the bank on May 31 but the bank gave credit for the same in June, 2012.

(3) There was also a debit in the passbook of Rs. 2,500 in respect of a cheque dishonoured on 31.5.2012. Prepare a bank reconciliation statement as on May 31, 2012

Why metals are malleable and ductile ??

Explain with suitable example the metal used to reduce the oxides of less reactive, moderately reactive, highly reactive metals.

The cell reaction in a galvanic cell is

$Cu\left(s\right)+2A{g}^{+}\left(aq\right)\to C{u}^{+2}\left(aq\right)+2Ag\left(s\right)$

Then the incorrect statement is

Why should magnesium ribbon be cleaned before burning in air?

How electrolysis helps in removing impurities of metal under cuso4 solution?

And after the process the impurities settle under the anode. How ,why

What are hydroxyl ions?

What is a substitution reaction?

When hydrogen is passed over copper oxide, copper and steam are formed. Write a balanced equation for this reaction and state which of the chemicals are :

(i) elements (ii) compounds (iii) reactants

(iv) products (v) metals (vi) non-metals

If a neutron makes a head-on collision with a stationary deuteron; the fractional energy loss of neutron in the collision is

The correct electronic configuration of an alkaline earth metals can be:

The metal which can be extracted simply by heating the cinnabar ore in the air is:
(a) Zn (b) Cu (c) Al (d) Hg

What happens when an acid reacts with a metal hydrogen carbonate? Write an equation of the reaction which takes place.

What is metal activity series ?

Which of the following properties are shown by simple hydrocarbons with 4-5 carbon atoms?

Which acid is produced when sulphuric acid reacts with sodium acetate?

The sides of a quadrilateral ABCD in order are AB = 6, BC = 18, CD = 6, DA = 10. If the restriction is that the diagonal BD must be an integer, the number of such quadrilaterals is

What will determine the valency of an element?

How to identify the type of bond it forms?

How will you prove that a given salt is a carbonate of a metal.

what is a homologous series ??