Give balanced equations for the laboratory preparations of the following organic compounds:

An unsaturated hydrocarbon from calcium carbide.

Give balanced equations for the laboratory preparations of the following organic compounds:

An alcohol from ethyl bromide.

Give the structural formulae for the following.

i) an isomer of n-butane

ii) 2- propanol.

iii) diethyl ether

Give reasons for the following :

Methane does not undergo addition reaction, but ethane does.

Give reasons for the following :

Ethyne is more reactive than ethane.

Give reasons for the following :

Hydrocarbon is excellent fuels.

47.

 

Group Number	IA	IIA	IIIA	IVA	VA	VIA	VIIA	0 18
2nd Period	Li		D			O	J	Ne
	A	Mg	E	Si		H	M
	R	T	I		Q	u		y

 

* In this table H does not represent Hydrogen.

* Some elements are given in their own symbol and position in the periodic table.
* While others are shown with a letter.

With reference to the table answer the following question:

I)  Identify the most electronegative element.

II) Identify the most reactive elements of group 1.

III) Identify the element from period 3 with least atomic size.

IV)  How many valence electrons are present in Q?

V)   Which element from group 2 would have the least ionisation energy?

VI)   Identify the noble gas of the fourth period.

VII)  In the compound of A and H, what type of bond would be formed and give the molecular formula for the same?

From the list given below, select the word (s) required to correctly complete blanks(i) to (v) in the following passage. The words from the list are to be used only once. Write the answers as (a)(i),(ii),(iii)and so on. Do not copy the passage.

[ammonia,ammonium, carbonate, carbon dioxide, hydrogen, hydronium, hydroxide,precipitated, salt , water]:

A solution M turns blue litmus red, so it must contain(i)........ ions; another solution O turns red litmus blue and hence must contain(ii).........ions

When solution M and O are mixed together, the product will be (iii)...........and (iv)..........

If a piece of magnesium was put into a solution M, (v) .......... Gas would be evolved.

Identify the gas evolved in the following reaction when:

Potassium sulphite is treated with dilute hydrochloric acid.

Choosing the substances from the list given below, write balanced chemical equations for the reactions which would be used in the laboratory to obtain the following salts:

i) Sodium sulphate

ii) Zinc carbonate

iii)Copper(II) sulphate               

iv) Iron (II) sulphate