Chemistry 1st PUC Question Paper. We covered all the Chemistry 1st PUC Question Paper in this post for free so that you can practice well for the exam.
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Chemistry 1st PUC Objective Question Paper for Students
With the increase in atomic number the ionic radii of actinides :
(A) contract slightly
(B) increase gradually
(C) show no change
(D) change irregularly
Option a – contract slightly
The nonexistent oxide of Vanadium is
(A) V₂O3
(B) VO2
(C) V3O2
(D) VO
Option c – V3O2
An example of acidic oxide is
(A) Mn2O3
(B) Mn3O4
(C) V3O2
(D) None of these
Option d – None of these
Coagulation of blood takes place by :
(A) Ferric alum
(B) potash alum
(C) both A and B
(D) none
Option c – both A and B
When H₂O2 is added to an acidified solution of K₂Cr₂O7 :
(A) the solution turns green due to the formation of Cr2O3
(B) the solution turns yellow due to the formation of K₂CrO4
(C) a deep blue-violet colored compound Cro (O2)2 is formed
(D) the solution gives green ppt. of Cr(OH)3
Option c – a deep blue-violet colored compound Cro (O2)2 is formed
Select the element in the following which does not show a +4 oxidation state :
(A) Ti
(B) Zr
(C) La
(D) Pt
Option c – La
Calomel on reaction with NH4OH gives
(A) HgNH₂Cl
(B) NH2-Hg-Hg-Cl
(C) Hg2O
(D) HgO
Option a – HgNH₂Cl
Which of the following statement (s) is (are) correct when a mixture of NaCl and K₂Cr2O7 is gently warmed with conc. H₂SO4?
(A) A deep red vapor is evolved
(B) The vapor when passed into the NaOH solution gives a yellow solution of Na2CrO4
(C) Chromyl chloride is formed
(D) All of these
Option d – All of these
In the dichromate dianion
(A) 4, Cr-O bonds are equivalent
(B) 6, Cr-O bonds are equivalent
(C) All, Cr-O bonds are equivalent
(D) All, Cr-O bonds are non-equivalent
Option b – 6, Cr-O bonds are equivalent
Which of the following compounds exhibit the same color in the aqueous solution?
(A) VOCl₂ & FeCl₂
(B) FeCl2 & CuCl2
(C) MnCl2 & FeCl2
(D) VOCl₂ & CuCl₂
Option d – VOCl₂ & CuCl₂
Reduction of the metal center in aqueous permanganate ion involves
(A) 3 electrons in a neutral medium
(B) 5 electrons in an acidic medium
(C) 3 electrons in an alkaline medium
(D) All of these
Option d – All of these
The color of light absorbed by an aqueous solution of CuSO4 is
(A) orange-red
(B) blue-green
(C) yellow
(D) violet
Option a – orange-red
Which of the following hydrogen halides react(s) with AgNO3(aq) to give a precipitate that dissolves in Na2S2O3(aq)?
(A) HCI
(B) HI
(C) HBr
(D) All of these
Option d – All of these
The elements from thorium (At. No. 90) to lawrencium (At. No. 103) in which 5f energy levels are filled up are called :
(A) lanthanides
(B) rare earth
(C) actinides
(D) transuranic
Option c – actinides
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