AP Polycet (Polytechnic) 2022 Previous Question Paper with Answers And Model Papers With Complete Analysis

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AP POLYCET
Section — A
CHEMISTRY

Polycet Mock Test

91) Which of the following is not a chemical process?

A) Rusting of Iron
B) changing water into water vapour
C) Mixing metal acid and base
D) Baking a cake

View Answer
B) changing water into water vapour

Explanation:Rusting, baking, and acid-base reactions are chemical changes.Changing water into vapor is a physical change (no new substance).
Answer:changing water into water vapour

92) What is the value of X in the following balanced equation?
YH2+O2+XH2O

A) 4
B) 3
C) 2
D) 1

View Answer
C) 2

Explanation:The balanced equation is:
YH_2 + O_2 ⇒ XH_2O
Let’s assume YH₂ is like H₂ (diatomic) and we balance:
2YH_2 + O_2 → 2H_2O ⇒ X = 2

93) If Q is the heat energy, determine the nature of the reaction in the following equation: 2C2H6 +702 →4CO2 +6H2O+Q

A) Exothermic
B) Endothermic
C) Both Exothermic and Endothermic
D) can’t be determined

View Answer
A) Exothermic

Explanation:Since Q is released, the reaction gives off heat → exothermic.

94) In the equation given below, 100g of CaCO3 and 73g of HCI are used to prevent 18g of H2O. If 300g of CaCO3 and 146g of HCl are used, then how many grams of H2O is produced?

A) 54
B) 36
C) 300
D) 146

View Answer
B) 36

Explanation:Given:
100g CaCO₃ + 73g HCl → 18g H₂O
Scaling up 3× CaCO₃ = 300g and 2× HCl = 146g
Limiting reagent here is HCl (not enough to go 3×)
If 73g HCl gives 18g H₂O → 146g gives 36g

95) Which of the following is/are used to detect acidic or basic nature of a solution?

A) Phenolphthalein
B) Metals
C) Universal Indicator
D) All of these

View Answer
D) All of these

Explanation:Phenolphthalein and universal indicator are used to detect pH.Metals do not indicate acidity/basicity.
Answer:All of these *(Note: technically metals don’t detect pH, but likely included here in a broad sense)*

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