Class 10 Chemistry :80
Section A : 40
Que 1:
I.Multiple choice :
1.the number of molecules of gas produced when molten sulfur and chlorine
,provided that the volume is 4.48 litres ,at stp ( S = 32,Cl= 35.5).:
a.3.011×10^24 ,b.1.20 ×10^23,c.36.6×10^23 ,d. 0.033×10^-23
2.Consider the following solutions :
P: consists of distilled water mixed with SO2 gas .
Q: Solution of Sulfur in toluene(solvent ).
R: Comprises of highly pure Sulfuric acid of nearly 99.99%
S: Molten Potassium hydroxide
Which will be electrolyzed using Platinum electrodes in the hoffman apparatus
with no water added :
a.P,S
b.R,P
c.S,R,Q
d.P,Q,R
3.Assertions(A): The anhydride of HCl is Cl .
Reasons(R) : HCl is a protic acid which leads to dissociated into H+ and Cl- in h2o.
a.A is correct ,R is also correct and R is correct explanation of A.
b.A is correct , R is correct but R is not correct explanation of A.
c.A is incorrect ,R is correct
d.A is correct but not R.
, 4.Compound that can be purified using froth floatation process is :
a.AgS
b.ZnS
c.MnO2
d.CuSx
5.How will a scientist dissolve Platinum wire so as to electro plate on copper
,using following acid mixtures:
a.HNO3: H2SO4
b.HCl : H2SO4
c.HClO4 :HNO3
d.HNO3: HCl
6.Which of the following is Not correct explanation of electroplating of Nickel on
brass ornament :
a.Nickel metal is kept as anode and brass a cathode
b.sodium cyanonikalte [Na2Ni(CN)4] is used as salt for electroplating
c.surface of brass is cleaned with dilute acid and made smooth for good plate.
d.Nickel acetate and NaCl mixture increases cost effectiveness in plating..
7.Number of moles in 3.56mg of C6H15N is (given: C = 12,H =1.008,N=14)amu :
a.3.52×10^-3
b.0.0352
c.28.37
d.0.35× 10^2
8.element that can be extracted using reducing gases is :
a.Hg
b.Pb
Section A : 40
Que 1:
I.Multiple choice :
1.the number of molecules of gas produced when molten sulfur and chlorine
,provided that the volume is 4.48 litres ,at stp ( S = 32,Cl= 35.5).:
a.3.011×10^24 ,b.1.20 ×10^23,c.36.6×10^23 ,d. 0.033×10^-23
2.Consider the following solutions :
P: consists of distilled water mixed with SO2 gas .
Q: Solution of Sulfur in toluene(solvent ).
R: Comprises of highly pure Sulfuric acid of nearly 99.99%
S: Molten Potassium hydroxide
Which will be electrolyzed using Platinum electrodes in the hoffman apparatus
with no water added :
a.P,S
b.R,P
c.S,R,Q
d.P,Q,R
3.Assertions(A): The anhydride of HCl is Cl .
Reasons(R) : HCl is a protic acid which leads to dissociated into H+ and Cl- in h2o.
a.A is correct ,R is also correct and R is correct explanation of A.
b.A is correct , R is correct but R is not correct explanation of A.
c.A is incorrect ,R is correct
d.A is correct but not R.
, 4.Compound that can be purified using froth floatation process is :
a.AgS
b.ZnS
c.MnO2
d.CuSx
5.How will a scientist dissolve Platinum wire so as to electro plate on copper
,using following acid mixtures:
a.HNO3: H2SO4
b.HCl : H2SO4
c.HClO4 :HNO3
d.HNO3: HCl
6.Which of the following is Not correct explanation of electroplating of Nickel on
brass ornament :
a.Nickel metal is kept as anode and brass a cathode
b.sodium cyanonikalte [Na2Ni(CN)4] is used as salt for electroplating
c.surface of brass is cleaned with dilute acid and made smooth for good plate.
d.Nickel acetate and NaCl mixture increases cost effectiveness in plating..
7.Number of moles in 3.56mg of C6H15N is (given: C = 12,H =1.008,N=14)amu :
a.3.52×10^-3
b.0.0352
c.28.37
d.0.35× 10^2
8.element that can be extracted using reducing gases is :
a.Hg
b.Pb
