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  #2  
20th November 2014, 09:29 AM
Super Moderator
 
Join Date: Apr 2013
Re: GUJCET exam question paper of Chemistry

Here is the GUJCET exam question paper of Chemistry

Which one of the following is the correct statement?
i. Chlorides of both beryllium and aluminium have bridged chloride structures in solid phase.
ii. B2H6.2NH3 is known as 'inorganic benzene'.
iii. Boric acid is a protonic acid.
iv. Beryllium exhibits coordination number of six.
Sol: Becl2 and Alcl3 both have bridged structure in solid phase.
B3N3 H6 is known as inorganic benzene.
Boric acid is Lewis acid.
Beryllium exhibits coordination number of 4

The pKa of a weak acid, HA is 4.80. The pKb of a weak base, BOH, is 4.78. The pH of an aqueous solution of
the corresponding salt, BA, will be
i. 7.01
ii. 9.22
iii. 9.58
iv. 4.79

Amount of oxalic acid present in a solution can be determined by its titration with KMnO4solution in the
presence of H2SO4. The titration gives unsatisfactory result when carried out in the presence of HCl, because HCl
i. reduces permanganate to Mn2+.
ii. oxidises oxalic acid to carbon dioxide and water.
iii. gets oxidised by oxalic acid to chlorine.
iv. furnishes H+
ions in addition to those from oxalic acid.
Sol: KMnO4can oxidise HCl along with oxalic acid into Cl2 and itself gets reduced to Mn2+.

Among the following substituted silanes the one which will give rise to cross linked silicone polymer on
hydrolysis is
i. R2SiCl2
ii. R3SiCl
iii. R4Si
iv. RSiCl3

Which of the following factors is of no significance for roasting sulphide ores to the oxides and not subjecting
the sulphide ores to carbon reduction directly?
i. Metal sulphides are less stable than the corresponding oxides.
ii. CO2is more volatile than CS2.
iii. Metal sulphides are thermodynamically more stable than CS2.
iv. CO2is thermodynamically more stable than CS2.







For whole paper here is the attachment of it
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File Type: pdf Question paper of Chemistry GUJCET exam.pdf (216.6 KB, 101 views)
  #3  
22nd March 2015, 11:02 AM
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Guest
 
Re: GUJCET exam question paper of Chemistry

Hey, my sister passed 12th class examination , now she want to appear in GUJCET exam , will you provide GUJCET exam Chemistry question paper for her ?
  #4  
22nd March 2015, 11:09 AM
Super Moderator
 
Join Date: Apr 2013
Re: GUJCET exam question paper of Chemistry

As you want I am here providing you GUJCET exam Chemistry question paper for you sister .

Sample paper :
(1) Phosphorus pentoxide is widely used as ………
(a) reducing agent (b) oxidizing agent
(c) dehydrating agent (d) bleaching agent
Ans. (c)
(2) Which of the following compounds, when heated at 483K turns to caramel?
(a) Lactose (b) Fructose (c) Sucrose (d) Glucose
Ans. (c)
(3) Calculate the normality of 250 ml aqueous solution of H2S4 having pH = 0.00
(a) 2 N (b) 1 N (c) 0.50N (d) 0.25N
Ans. (a)
(4) Which property of Na2S2O3 makes it useful in photography?
(a) Reducing agent (b) Oxidizing agent
(c) Complex formation property (d) Photochemical property
Ans. (c)
(5) During which phenomenon does entropy decreases?
(a) Rusting of iron
(b) Sublimation of camphor
(c) Melting of ice
(d) Crystalization of sucrose from its solution

(12) Which of the following is the correct order of priority of groups in D-glyceraldehyde?
(a) CHO (1), OH (2), CH2OH (3) and H (4)
(b) CH2OH (1), CHO (2), OH (3) and H (4)
(c) OH (1), CH2OH (2), CHO (3) and H (4)
(d) OH (1), CHO (2), CH2OH (3) and H (4)
Ans. (d)
(13) Why do 2º and 3º amines fail to undergo the carbylamine test?
(a) All the given reasons are correct?
(b) The Nitrogen atom of the amine group does not have the required number of
hydrogen atoms
(c) They react with alcoholic KOH.
(d) They combine with chloroform to give a stable compound.
Ans. (b)

GUJCET exam Chemistry question paper





Here is the attachment..........................
Attached Files
File Type: pdf GUJCET exam Chemistry question pape.PDF (575.1 KB, 90 views)


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