CISCE Board - Class 7

Chemical Reactions & Atomic Structure question bank (Chemistry)

Practice 273 free CISCE Board - Class 7 Chemistry - Chemical Reactions & Atomic Structure questions with answers and step-by-step solutions.

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Q1.

Acids, Bases & Salts: In 'Matter and its Composition: Dalton's Atomic Theory', what gas is evolved when a metal reacts with dilute acid?

(A)
Hydrogen gas ($H_2$) which burns with a pop sound (Matter and its Composition: Dalton's Atomic Theory)
(B)
Oxygen gas ($O_2$)
(C)
Carbon dioxide ($CO_2$)
(D)
None of these
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Q2.

Gas Laws: According to Boyle's Law in 'Matter and its Composition: Dalton's Atomic Theory', at constant temperature:

(A)
$P_1 V_1 = P_2 V_2$ ($P \propto \frac{1}{V}$) (Matter and its Composition: Dalton's Atomic Theory)
(B)
$\frac{{V_1}}{{T_1}} = \frac{{V_2}}{{T_2}}$
(C)
$P = V \cdot T$
(D)
None of these
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