Warning: chmod() [function.chmod]: Operation not permitted in /home/mpkeshari/public_html/wp-content/plugins/wpmathpub/wpmathpub.php on line 85
M P Keshari » ICSE GUESS PAPER in CHEMISTRY for 2012

ICSE GUESS PAPER in CHEMISTRY for 2012

This item was filled under [ ICSE ]

ICSE Guess Paper in CHEMISTRY for 2012

SCIENCE Paper – 2

(Time – One hour and a half)

(Issued by ICSE Board)

Answers to this Paper must be written on the paper provided separately.

You will not be allowed to write during the first 15 minutes.

This time is to be spent in reading the Question Paper.

The time given at the head of this paper is the time allowed for writing the answers.Section I is compulsory. Attempt any four questions from Section II.

The intended marks for questions or parts of questions are given in brackets [ ].

SECTION I (40 Marks)

Attempt all questions from this Section

Question 1

(a) Choose the most appropriate answer.

(i) Which of the following is a common characteristic of a covalent compound?

A High melting point.

B Conducts electricity when it is in the molten state

.C Consists of molecules.

D Always soluble in water.

(ii) Ammonium hydroxide will produce a reddish brown precipitate when added toa solution of :

A CuSO4

B Zn(NO3)2

C FeSO4

D FeCl3

(iii) A salt which in solution gives a bluish white precipitate with NaOH solutionand a white precipitate with BaCl2 solution is:

A CuSO4

B FeSO4

C Fe2 (SO4)3

D CuCl2

(iv) The gas law which relates the volume of a gas to moles of the gas is:

A Avogadro’s Law

B Gay-Lussac’s Law

C Boyle’s Law

D Charle’s Law

(v) During the electrolysis of acidified water which of the following takes place:

A Oxygen is released at cathode.

B Oxygen is released at anode.

C Hydrogen is released at anode.

D Sulphur dioxide is released at anode.

(vi) Duralumin is an alloy of

A Al and Cu

B Cu and Sn

C Al and Ag

D Al and Fe

(vii) Hydrogen chloride can be obtained by adding concentrated Sulphuric acid to:

A NaCl

B Na2SO4

C Na2CO3

D NaNO3.

(viii) Which of the following reactions gives copper as a product

A Passing dry ammonia over heated copper oxide.

B Adding dilute hydrochloric acid to copper oxide.

C Heating copper oxide.

D Passing oxygen over heated copper oxide?

(ix) Formation of chloroform from methane and chlorine is an example of:

A Addition

B Dehydration

C Substitution

D Elimination.

(x) The element with the highest ionization potential in the periodic table is:

A He

B Ne

C Ar

D Xe [10]

(b) The equation for the action of heat on calcium nitrate is:

2Ca(NO3)2 ® 2CaO + 4 NO2­ + O2

­(i) How many moles of NO2 are produced when 1 mole of Ca(NO3)2 decomposes?

(ii) What volume of O2 at S.T.P. will be produced on heating 65.6 g of Ca (NO3)2?

(iii) Find out the mass of CaO formed when 65.6 g of Ca(NO3)2 is heated.

(iv) Find out the mass of Ca(NO3)2, required to produce 5 moles of gaseousproducts.

(v) Find out the mass of Ca(NO3)2 required to produce 44. 8 L of NO2 at S.T.P.(Relative molecular mass of Ca(NO3)2 = 164 and of CaO = 56) [5]

(c) Name the organic compound prepared by each of the following reactions:

(i) CH3 COONa + NaOH CaOD¾¾¾®

(ii) CaC2 + H2O ®

(iii) C2H5Br + KOH (alc) ®

(iv) C2H5Br + KOH (aq) ®

(v) C2H5OH + CH3COOH Con.H2SO4D¾¾¾¾® [5]

(d) Identify the following substances:

(i) An acidic gas which gives dense white fumes with NH3.

(ii) An alkane whose molecular mass is 58. (H = 1; C = 12)

(iii) A solid which when kept in the open, forms a solution after sometime.

(iv) An alloy used in electrical fittings.

(v) A metal which gives hydrogen gas on reacting with both dilute acid and alkali. [5]

(e) Write equations for the following reactions:

(i) Aluminium oxide and Sodium hydroxide.

(ii) Zinc and dilute sulphuric acid.C2H5 O C2H5

(iii) Magnesium nitride and water.

(iv) Concentrated sulphuric acid and sugar.

(v) Copper with concentrated nitric acid. [5]

(f) Name the following:

(i) Second member of alkene series

(ii) First member of alkane series

(iii) Third member of aldehyde series.

(iv) Second member of carboxylic acid.

(v) Fourth member of alcohol series. [5]

(g) Write the I.U.P.A.C. names of the following compounds:

(i)

(ii)

(iii)

(iv)

(v) [5]

SECTION II (40 Marks)

Attempt any four questions from this Section.

Question 2.

(a) The following questions refer to the periodic table:

(i) Name the second last element of the period 3.OH C HOH3C C CH3HCHH C CHHOHCHHHHH3C C CH3CH3CH3

(ii) How many elements are in the second period?

(iii) Name the element which has the highest electron affinity.

(iv) Name the element which has the highest electro negativity

.(v) Name the element which may be placed on group 1 but is not a metal. [5]

(b) Fill in the blanks using the correct options:

(i) Metals have —— ionisation potential. (low/ high)

(ii) Group 18 elements have —— valence electrons (4 / 8) with theexception of —- ( He / Ne) with ——– electrons (2 / 8) in valenceshell.

(iii) Group 2 elements are called —– metals (alkali / alkaline earth). [5]

Question 3.

(a) Draw different isomers having the following molecular formula:

(i) C5H12 (chain)

(ii) C4H8 (position). [5]

(b) What is denatured alcohol? [1]

(c) Give two important uses of ethanol. [2]

(d) Write equations for:

(i) Preparation of ethanol by hydration of C2H4.

(ii) Preparation of acetic acid from ethanol. [2]

Question. 4

(a) Name the method by which following compounds can be prepared:Select the appropriate method from the following list Neutralization; directcombination; precipitation; metal + acid – use a method only once.

(i) Sodium sulphate

(ii) Silver chloride

(iii) Iron sulphide. [3]

(b) How will you distinguish between following pairs of compounds usingNH4OH.

(i) Copper sulphate and iron(II) sulphate.

(ii) Zinc nitrate and lead nitrate.

(iii) Iron(II) sulphate and iron(III) sulphate. [3]

(c) Name:

(i) A greenish yellow gas with pungent smell.

(ii) An oxide which is yellow when hot and white when cold.

(iii) A gas with a rotten egg smell.

(iv) A crystalline salt without water of crystallization. [4]

Question. 5

(a) Name one:

(i) metal liquid at room temperature.

(ii) non-metal which is a conductor of electricity

.(iii) neutral oxide.

(iv) metallic oxide which cannot be reduced by hydrogen.

(v) non-metal which has lustre. [5]

(b) (i) Name the chief ore of aluminium.

(ii) Name the process used to concentrate the above mentioned ore.

(iii) Why is alumina added to cryolite in the electrolytic reduction ofaluminium?

(iv) Give cathode and anode reactions involved in extraction of aluminiumfrom its above mentioned ore.

(v) Name the process used for the concentration of zinc blende. [5

]Question 6.

(a) Draw a neat and well labelled diagram for the silver plating on an ironspoon. [3]

(b) Copy and complete the following table related to electrolysis.S.No. Name of Electrolyte Name ofCathodeName ofAnodeProduct atCathodeProduct atAnode1. CuSO4 (aq.) Copper Copper2. PbBr2 (molten) Platinum Platinum[4]

(c) Classify the following as oxidation and reduction reaction, also complete thereaction.

(i) Cu Cu2+

(ii) Fe3+ Fe2+

(iii) Cl- Cl[3]

Question. 7

(a) A compound has the following percentage composition by mass:Carbon – 54.55%, Hydrogen – 9.09% and Oxygen – 36.26%. Its vapour densityis 44. Find the Empirical and Molecular formula of the compound.

(H = 1; C = 12; O = 16) [5]

(b) Give the electron dot structure of the following:

(i) NH3

(ii) CH4

(iii) H3O+ [3]

(c) Compare the properties of covalent and electrovalent compounds on thefollowing points:

(i) Solubility

(ii) Structure. [2]

Tagged with: [ ]
You can follow any responses to this entry through the RSS 2.0 feed. Both comments and pings are currently closed.