Question

IC
1 (xvii) When iron nails are kept in copper
sul-
phate solution for 2-3 hours and then
taken out and washed. The colour of
iron nails be
(a) Red
(b) brown
(c) black
(d) grey
(xviii) Which of the following statements is not
correct when barium chloride solution |
is mixed with sodium sulphate solution |
(a) It is a redox reaction
1
(b) It is a fast reaction
(c) It is a double displacement reaction
(d) It is a precipitation reaction.
1 (xix) Which of the following is a displace-
ment reaction
1 (a) MgCO, MgO +CO,
(b) 2Na+2H,
02NaOH +H,
(c) 2H, +0,2H,0
(d) 2Pb (NO), 2PbO + 4NO, +0,
(xx) Oxidation is a process which involves
1
(a) removal of hydrogen
(b) addition of oxygen.
(c) removal of oxygen
1
(d) addition of hydrogen.
(xxi) Reduction involves-
(a) addition of oxygen
(b) removal of hydrogen
I
(c) addition of hydrogen
(d) removal of oxygen
! (xxii) When Ag is exposed to air it gets a black
coating of
(a) AgNO,
I
(b) Ag,
(c) Ago (d) Ag,Co,
| (xxiii) What type of chemical reaction takes
1 place when electricity is passed through
water?
(a) Double displacement
1
(b) Combination
(c) Displacement
(d) Decomposition.
(xxiv) The condition produced by aerial Oxida-
tion of fats and oils in foods marked by
Unpleasant small and taste is called
1
(a) reduction
(b) rancidity
(c) corrosion
(d) antioxidants.
(xxy) When green coloured ferrous sulphate
crystals are heated, the colour of the
crystals changes because
1 (a) It forms so,
1
(b) It is decomposed to ferric oxide
1 (c) It forms So,
(d) It loses water of crystallisation,​

Answer 1

Answer:

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