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In a reaction between zinc and hydrochloric acid, the changes accompanying a reaction are:

(i) What is observed when a solution of potassium iodide is added to a sulution of lead nitrate taken in a test tube ?
(ii) What type of reaction is this ?
(iii) Write a balanced chemical equation to represent the above reaction.

$C-C\left(I\right),C=C\left(II\right)andC\equiv C\left(III\right)$ are three bond types, then their bond enthalpy will be respectively,

What happens when metal react with acid.

$C{r}_2{O}_3+3Ca\to 2Cr+3CaO$

The following reaction shows that nature of calcium?

At What temperature in the celsius scale, V (volume) of a certain mass of gas at ${27}^{\circ }$ C will be doubled keeping the pressure constant

Give reasons for:

a) Platinum, gold and silver are used to make jewellery.

b) Sodium, potassium and lithium are stored under oil.

c) Aluminium is a highly reactive metal, yet it is used to make utensils.

d) Carbonate and sulphide ores are usually converted into their oxides during the process of extraction.

e) Copper vessels, when exposed to air, form a greenish coating all around.

Take about 2g barium hydroxide in a test tube .Add 1g of ammonium chloride and mix with the help of glass rod .Touch the bottom of the test tube with your palm what do you feel? Is this an exothermic or endothermic reaction?

Of the two gases NH3 and HCl , which is more dense. Name the method of collection of this gas .

give one example of a reaction between the above two gases which produces a solid.

The branch of electrometallurgy comprises

One mole of magnesium in the vapour state absorbed 1200 kJ ${mole}^{-1}$ of energy. If the first and second ionization energies of Mg are 750 and 1450 kJ ${mole}^{-1}$ respectively, the final composition of the mixture is

Oxidising Agent + Hydrochloric Acid → Salt + Water + ___

The conversion of methane to chloromethane is a type of

Salt can be separated from seawater by _____.

Which period in the periodic table has both 's' and 'p' block elements?

The molecular formula for eelemental sulphur si $S_8$. In a sample of 5.12 g of slphur:
(a) how many moles of sulphur are present ?
(b) HOw many molecules and atoms are present?

Describe with one example, how moderately reactive metals (which are quite low in the reactivity series) are extracted.

Na + H₂O $\to$ Na₂O + H₂
In this reaction, what can you say about water?

Which of the following non-aqueous solvents are used to dissolve organic compounds?

Which of the following properties are unique about carbon?

Write the formulae and IUPAC names of first two carboxylic acid. [2 MARKS]

How can we say that the reactivity of an element is high or the reactivity of an element is low????

When the sample of copper with zinc impurity is to be purified by

electrolysis, the appropriate electrodes of cathode and anode are

[AIEEE 2002]

In froth floatation process, ______ is wetted by the oil and _____ is wetted by the water.

Which of the following graphs are correct for the given reaction; $H_2\left(g\right)+C{O}_2\left(g\right)\rightleftharpoons H_{2}O\left(g\right)+CO\left(g\right)$
Assume initially only $H_2$ and $C{O}_2$ are present :

How and why does the atomic size vary as you go:
1. From left to right across a period?
2. Down a group?
[3 MARKS]

1. 5

Which is the ultimate source of energy on earth? [1 MARK]

what is blance chemical reaction ?

What happens when HCl gas is heated with metals that come before hydrogen in the electrochemical series?

What do you mean by colour cahang during chemical reaction

Match the following compounds with their molecular mass.

(i) ${\text{SO}}_2$ (ii) ${\text{CO}}_2$ (iii) ${\text{NO}}_2$ (iv) ${\text{H}}_2\text{O}$

(a) 44 u (b) 64 u (c) 18 u (d) 46 u

How are the following obtained :
(a) absolute alcohol,

(b) spurious alcohol,
(c) methylated spirit?

The reason behind large number of organic compounds is ___

Complete and balance the following equations :

(a) $NaOH+.............⟶$ $N{a}_{2}S{O}_4+H_{2}O$

(b) $Ca(OH{)}_2$ + ............. $⟶$ $CaC{O}_3+H_{2}O$

Manveer started his business on January 01, 2005 with a capital of Rs. 4,50,000. On December 31, 2005, his position was as under

$\begin{array}{cc}\text{Items}& (Rs.)\\ \text{Cash}& 99,000\\ \text{Bills Receivable}& 75,000\\ \text{Plant}& 48,000\\ \text{Land and Building}& 1,80,000\\ \text{Furniture}& 50,000\end{array}$

He owed Rs. 45,000 from his friend Susheel on that date. He withdrew Rs. 8,000 per month for his household purposes. Ascertain his profit or loss for this year ended December 31, 2005.

State three differences between acids and bases. [3 MARKS]

The valency of hydrogen is 1 and valency of carbon is 4. What is the maximum number of hydrogen atoms required to attain the octet configuration by the carbon?

Name two non-metals which are both brittle and non-ductile.

Which of the following compound is an isomer of the compound given above?

The pH value of a solution is in the range of 6 to 8. What is the colour developed when a student adds 3 drops of universal indicator in the solution?