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Explain why :

(a) It is necessary to find out the ration of reactants required in the preparation of sodium sulphate,

(b) Fused calcium chloride is used in the preparation of $FeC{l}_3$?

(c) Anhydrous $FeC{l}_3$ cannot be prepared by heating hydrated Iron (III) chloride.

(a) What is rust? Give the equation for the information of rust.

(b) State two conditions necessary for rusting of iron?

(c) How does the painting of an iron object prevent rusting?

Eventhough diamond, silica, sugar and urea are solids,why are they classified as covalent compounds?

Do basic solution also have H+ ions? If yes, then why are they basic

Write the equation in step.

(I)Can(OH2)+HNO3=Can(No3)2+H2O

What are the differences between alkali metals, alkali earth metals and alkaline?

Vinod has the following transactions. Show accounting equation for the same:

(i) Commenced business with cash Rs. 3,00,000.

(ii) Purchased goods for cash Rs. 80,000.

(iii) Purchased machinery on credit Rs. 1,25,000.

(iv) Purchased old car for personal use for Rs. 1,00,000.

Although there's anamoly with respect to position of hydrogen. But it is placed in group 1. Why in group 1 and why nin in group 17?

Match the following:

$$\begin{array}{cc}\text{Elements}& \text{Electronic configuration}\\ \text{(i) Alcohol}& \text{(a) -al}\\ \text{(ii) Aldehyde}& \text{(b) -ol}\\ \text{(iii) Triple bond}& \text{(c) -one}\\ \text{(iv) Ketone}& \text{(d) -yne}\end{array}$$

Why do covalent compounds have low melting and boiling points ?

What happens when aluminium reacts with boiling dil. NaOH?

(a) Name the blood vessel that brings oxygenated blood to the human heart.
(b) Which chamber of the human heart receives deoxygenated blood?
(c) Describe the process by which deoxygenated blood from this chamber is sent to all parts of the body.

Conc. sulphuric acid oxidises phosphorus to

The most abundant element in earth core is ___.

(a) What change would you observe in the calcium Hydroxide solution taken in tube B?

(b) Write the reaction involved in test tube A and B respectively

(c) If Ethanol is given instead of Ethanoic acid, would you expect the same change?

(d) How can a solution of lime water be prepared in the laboratory?

The functional group of ethanol and ethanal is

Match the Following:

The alkaline hydrolysis of oils and fats is called:

(a) Give the general formula of (i) Alkene (ii) Alkane (iii) Alkynes

(b) Write the structural formula of propyne & 2,3 dimethylpentane.

A food chain represents a unidirectional flow of X. What is X?

(a) How do metals react with hydrogen? Explain with an example.
(b) How do non-metals react with hydrogen? Explain with an example.

If A, B, C, D, E, F, G, H, I, J and K represent metals in the decreasing order of their reactivity, which one of them is most likely to occur in a free state in nature?

Complete the following reaction:
$H_{2}C=CH-C{H}_3+HCl\to$

A hydrocarbon compound with 6-Carbon atoms in its chain can be named using which of the following word root?

The IUPAC name of the given compound is

Which of the following is not a part of stereo isomerism?

Question 115(ii)

Express the following in standard form:

A helium atom has a diameter of $0.000000022cm.$

A compound X is obtained by the reaction of alkaline $KMn{O}_3$ with another compound Y followed by acidification. Compound X also reacts with compound Y in presence of few drops of $H_{2}S{O}_4$ to form a sweet smelling compound Z. The compound X, Y and Z are respectively.

On eating spicy food we feel burning sensation in our stomach ,why? Which medicine will you take as a remedy

Calculate the gram molecular mass of $N_2$, if $360c{m}^3$ at STP weighs 0.45 g.

What is the electrolyte used for nickel electroplating?

From the statements given below, what are the harmful effects of acid rain?

1.Damage to vegetation by pollution of soil.

2. Animals will get skin tissue damage because of acid action.

3.Erosion of Taj Mahal.

4.Human visibility will be degraded.

5.Because of acid action, faster decomposition of dead material will occur.

6. PH of ocean water will turn from basic to acidic.

Rate of Reaction,

is fastest when ‘Z’ is

The density of sulphuric acid is ___ the density of water.

Which of the following bond/s contain ions?
(i) Ionic bond
(ii) Covalent bond
(iii) Metallic bond

Which among the following salt solutions have high pH ?

The functional group in methanol and methanal respectively are :

Why are we advised not to use animal fats for cooking

Question 5(d)
Write word equations and then balanced equations for the reaction taking place when:
(d) Dilute hydrochloric acid reacts with iron filings

To extract silver from copper by liquation, the ore is to be heated with ___.

Name the functional group present in each of the following compounds:
$\left(i\right)C{H}_{3}COC{H}_3$
$\left(ii\right)C_2{H}_{5}CHOOH$

No chemical reaction takes place when granules of a rusty-brown solid A are mixed with the powder of another solid B. However when the mixture is heated, a reaction takes place between. It's components. One of the products C is a metal and settle down in the molten state while the other product D floats over it. It was observed that the reaction is highly exothermic.
(a) What could the solids A and B be?
(b) What are the products C and D most likely to be?
(c) Write the chemical equation for the reaction between A and B leading to the formation of C and D. mention the physical states of all the reactants and products in this equation and indicate the heat change which takes place.
(d) What is the special name of such a reaction? State one use of such a reaction.
(e) Name any two types of chemical reactions under which the above reaction can be classified.

Identify saturated hydrocarbon from the following options.