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In an area where DDT had been used extensively, the population of birds declined significantly because:

If A is a set containing 7 elements and B is a set containing 15 elements then the maximum number of elements in the (A∩B) is?

The cathodic reaction during the charging of lead storage battery

Which of the following compounds has coordinate (dative) bond ?

Complete the following reaction:
$2{\mathrm{NH}}_3+3\mathrm{CuO}\to$

Give two balanced reactions of each type to show the following properties of sulphurric acid :

(a) Acidic nature, (b)Oxidising agent,

(c) Dehydrating nature, (d) Non- volatile nature.

(a) How does the atomic size vary on going down from top to bottom in a group of the periodic table? Why does it vary this way?

(b) Lithium, sodium and potassium are all metals that react with water to liberate hydrogen gas. Is there any similarity in the atoms of these elements? Explain your answer.

On 1st April, 2013 a firm purchased a machinery for Rs. 1,00,000. ON 1st July, 2016 the machinery became obsolete and was sold fro Rs. 40,000. The firm charges depreciation on its machinery 10% per annum on written down value method. The books are closed on 31st March of every year. Prepare necessary ledger accounts assuming that provision for depreciation account is maintained.

Ionic compounds are __

Which functional group has a general formula of $C_n{H}_{2n+1}$?

Baking soda is an example of?

Which of the following is called as strategic metal?

$KMn{O}_4$ acts as an oxidising agent in the neutral medium and gets reduced to $Mn{O}_2$. The equivalent weight of $KMn{O}_4$ in neutral medium is ______ .

The aqeous solution of ammonia is:

18g of steam is passed over 2g of Iron.$H_{2}O+Fe\to H_2+F{e}_2{O}_3$ Which is the excessive reagent? [Fe = 55.85g]

Why does aluminium not rust at the same rate as iron?

What is the chemical formula of iron ore Hematite?
(correct answer +1, wrong answer -0.25)

Balancing.1-HNO3+Can(oh)2->can(No3)2+h2o

Why does sodium have a higher ionization energy compared to pottassium

Calculate the pH of a solution which contains 9.9ml of 1M HCl and 1000 ml of 0.1M NaOH

Write scientific reason : Atomic radius goes on decreasing while going from left to right in a period

Match the following:

$$\begin{array}{cccc}1& Lacticacid& A& Tribasicacid\\ 2& HCl& B& Dibasicacid\\ 3& H_{3}P{O}_4& C& Sourmilkandyoghurt\\ 4& H_{2}S{O}_4& D& Monobasicacid\end{array}$$

Write the balanced chemical equations for the following reactions :

(a) Calcium hydroxide + Carbon dioxide $⟶$ Calcium carbonate + Water

(b) Aluminium + Copper chloride $⟶$ Aluminium chloride + Copper

Describe in brief an activity to investigate the conditions under which an article made of iron rusts. List any four methods used for the prevention of rusting of iron.

One electrolysing $K_{2}S{O}_4$ solution using inert electrodes, 1.68L (STP) of gases was obtained. How many moles of $Mn{O}_4^{-}$ could be reduced to $M{n}^{2+}$ by the same quantity of electricity ?

Identify 'X' in the following reaction.

FeCl₃ + 3NaOH → X + 3NaCl

The correct procedure to show that zinc is more reactive than copper is:

On the basis of sequence of reactions given below, identify the most reactive and least reactive element.

B + AX → BX + A

A + CY → AY + C

Carbon has a valency of four. It is capable of bonding with four other atoms of carbon or atoms of some other monovalent element, etc. What is this property of carbon known as?

Which colour residue is formed when sugar reacts with sulphuric acid?

Which of the following compounds has coordinate (dative) bond

The precipitate formed due to the reaction of ammonium hydroxide and copper sulphate is ___ and is ___ in colour

Which of the following is considered a metalloid?

how to identify a acidic oxide and a basic oxide?

In the reaction where Ethanol reacts with Sodium metal to give Sodium Ethoxide and Hydrogen gas
$C{H}_{3}C{H}_{2}OH+Na\to C{H}_{3}C{H}_{2}ONa+H_2$
ethanol behaves like _______.

Basicity means replaceable H⁺ ions but what is meant by replaceable H⁺ ions ?

The chemical reaction involved in the corrosion of iron metal is that of :

(a) oxidation as well as displacement (b) reduction as well as combination

(c) oxidation as well as combination (d) reduction as well as displacement

Question 9

Solid calcium oxide reacts vigorously with water to form calcium hydroxide accompanied by liberation of heat. This process is called slaking of lime. Calcium hydroxide dissolves in water to form its solution called lime water. Which among the following is (are) true about slaking of lime and the solution formed?

(i) It is an endothermic reaction
(ii) It is an exothermic reaction
(iii) The pH of the resulting solution will be more than seven
(iv) The pH of the resulting solution will be less than seven

(a) (i) and (ii)
(b) (ii) and (iii)
(c) (i) and (iv)
(d) (iii) and (iv)

Name two catalysts which can be used in the hydrogenation of unsaturated compounds.