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31. Which information is not converged by a balance chemical equation?
Physical quantity of reactants and products
Symbols and formula of all the substances involved in a particular reaction
No of atoms/molecules of the reactants and products formed
Whether a particular reaction is actually feasible or not
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32. Which of the following pairs will give displacement reactions? (NTSE Jharkhand, Stage-I, 2016-17)
NaCI solution and copper metal
MgCI2 solution and aluminium metal
FeS04 solution and silver metal
AgN03 solution and copper metal
33. Assertion (A): When we dip iron nail into CuS04 solution the colour of solutions changes. Reason (B) : Copper is less reactive than iron (NTSE Punjab, Stage-I, 2016-17)
Both A and R are correct but R is not correct reason for A
Both A and R are correct, R is correct reason for A
A is correct and R is incorrect
A is incorrect and R is correct
34. P, Q and Rare 3 metals that undergo chemical reactions as follows. P20 3 + 2Q → Q203 + 2P 2P + 3RO → P 203 + 3R 2RS04 + 2Q → Q2(S04)3 + 3R Observe the reactions and arrange the metals in the increasing order of their reactivity.(NTSE Tamil Nadu, Stage-I, 2016-17)
R, P, Q
Q, P, R
P, Q, R
Q, R, P
35. The addition of oxygen to a substance is called (NTSE Madhya Pradesh, Stage-I, 2016-17)
Redox
Oxidation
Reduction
None of these
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