DP Chemistry (last assessment 2024)

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Question 22N.1.hl.TZ0.29

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Date November 2022 Marks available [Maximum mark: 1] Reference code 22N.1.hl.TZ0.29
Level hl Paper 1 Time zone TZ0
Command term Determine Question number 29 Adapted from N/A
29.
[Maximum mark: 1]
22N.1.hl.TZ0.29

What is the coefficient for H+ when the equation below is balanced?

__Pb (s) + __NO3− (aq) + __H+ (aq) → __Pb2+ (aq) + __NO (g) + __H2O (l)

 

A.  2

B.  4

C.  6

D.  8

[1]

Markscheme

D

Examiners report

Only 43% of candidates could balance the equation and determine. Most students failed to realise that the coefficients needed to be doubled, because of the change in the oxidation state of Pb, and answered (B).

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