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Subjects
Science State Board
Class 10
Types of chemical reactions
Textbook questions

3. Choose the correct answer III

Exercise condition:

4 m.

1. Which of the following is not an “

$element + element → compound$ ” type reaction?

$C_{(s)} + O_{2(g)} → CO_{2(g)}$
$2K_{(s)} + Br_{2(l)} → 2KBr_{(s)}$
$2CO_{(g)} + O_{2(g)} → 2CO_{2(g)}$
\(4Fe_{(s)} + 3O_{2(g)} → 2Fe_2

2. Which of the following represents a precipitation reaction?

$A_{(s)}+ B_{(s)} → C_{(s)} + D_{(s)}$
$A_{(s)} + B_{(aq)} → C_{(aq)} + D_{(l)}$
$A_{(aq)} + B_{(aq)} → C_{(s)} + D_{(aq)}$
$A_{(aq)} + B_{(s)} → C_{(aq)} + D_{(l)}$

3. The pH of a solution is

$3$ . Its [

$OH^–$ ] concentration is

$1\times10^{–3}$ $M$
$3$ $M$
$1\times10^{–11}$ $M$
$11$ $M$

4. Powdered

$CaCO_3$ reacts more rapidly than flaky

$CaCO_3$ because of __________.

large surface area
high pressure
high concentration
high temperature

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