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Turmeric, a natural indicator in presence of bases turns:

Write the structural formula of propyne.

Atomic number of nitrogen is 7. What can be inferred from this?

Distinguish between esterification and saponification reactions of organic compounds.

The pair of elements which exhibits the property of catenation is :
(a) sodium and silicon (b) chlorine and carbon (c) carbon and sodium (d) silicon and carbon

What are anti-oxidants ? Why are they added to fat and oil containing foods ?

When copper ore is mixed with silica in a reverberatory furnace, copper matte is formed. The copper matte contains __.

What are the challenges faced by human beings in the environment?

From the part of a periodic table, answer the following question:

Out of 'Y' and 'Z' which element has smaller atomic size?

Pure nitric acid is colourless but the acid obtained in the laboratory is slightly yellow. The yellow colour is due to___.

The change that will take place in the mass number and atomic number of the nucleus Y when it is emits gamma radiations

The natural source of Acetic acid is:

With which substance should chlorine be treated to get bleaching powder ?

The Newland’s law of octaves for the classification of elements was found to be applicable only up to the element :

(a) potassium (b) calcium (c) cobalt (d) phosphorus

Hot concentrated ___ must be added to aluminium hydroxide to obtain potassium aluminate.

Give one example in each case :

(a) A basic oxide which is soluble in water,

(b) A hydroxide which is highly soluble in water,

(c) A basic oxide which is insoluble in water,

(d) A hydroxide which is insoluble in water,

(e) A weak mineral acid,

(f) A base which is not an alkali,

(g) An oxide which is a base,

(h) A hydrogen containing compound which is not an acid,

(i) A base which does not contain a metal ion.

Which of the following cannot work as oxidising agent

What is used for the production of vinegar?

Why do solid alkanes have low melting point?

Name:

(a) two metals which are liquid at room temperature,

(b) metal which do not corrode easily

(c) a metal which lacks ductility,

(d) a non-metal which is lustrous,

(e) a non-metal which conducts electricity,

(f) a metal which is brittle,

(g) two elements which are monoatomic,

(h) two metallic oxides which are acidic,

(i) two metallic oxides which are amphoteric,

(j) two metallic which react with cold water,

(k) the compound responsible for green deposit on the surface of copper,

(l) a non-metal which can form a positive ion,

(m) a non-metal which shows reducing property,

(n) a metal whose oxide is reduced only by carbon.

What are micelles ? Give an example of a micellers system

Question 41

What happens when a piece of

(a) zinc metal is added to copper sulphate solution?

(b) aluminium metal is added to dilute hydrochloric acid?

(c) silver metal is added to copper sulphate solution?

Also, write the balanced chemical equation if the reaction occurs.

What will be the pH value of 0.05 M Ba(OH)₂ solution.

What are the products when

a. Bases react with metal oxides.

b . Bases react with metal carbonates .

c. Bases react with metal hydroxides.

Ethanol, when heated with excess conc. $H_{2}S{O}_4$ at 443K undergoes ________.

What does waste mangagement means? How can you help in reducing the problem of waste disposal? Give any two methods. [3 MARKS]

A compound 'X' on heating with excess conc. sulphuric acid at 443 K gives an unsaturated compound 'Y'. 'X' also reacts with sodium metal to evolve a colourless gas 'Z'. Identify 'X, 'Y' and `Z'. Write the equation of the chemical reaction of formation of 'Y' and also write the role of sulphuric acid in the reaction.

How to balance a skeletal equation?

The reaction in which one functional group is replaced with another functional group is called:

Difference between polar and non-polar solvent.

The atomic numbers of the elements Na, Mg, K and Ca are 11, 12, 19 and 20 respectively. The element having the largest atomic radius is :

(a) Mg (b) Na (c) K (d) Ca

The molecular formula of chloroform is :

Which of the following statements are correct about $S{F}_4$?

Identify polar molecules among the following molecules.

Why do all the elements of the same group have similar properties? How will the tendency to gain electrons change as we go from left to right across a period? Why?
[3 MARKS]

Which of the following industries require compulsory licensing?

Find the number of H atoms in $9.033\times {10}^{23}$ molecules of water.

What is amalgam? State its use with an example.

If polyacidic bases dissociate in one step in aq. sol. , then why do they form different salts ( basic salts) on reacting with acids?

Glucose and alcohol have hydrogen ions but still they are not considered as acids.why?

The organic acid present in vinegar is:

Identify the figures of speech in the sentence.

Is a bitter sweet symphony, this life.

Name the method used to obtain lead from its ore galena (lead sulphide).

Which of the following words is the adjective form of a noun?

A compound X is chemically less reactive, undergoes combustion and substitution reaction. Identify the compound X.

A solution X has a pH value of 2 and another solution Y has a pH value of 1. Choose the correct answer among the following options: