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

AP 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?

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)*

96)Which of the following metal liberates H₂ gas on reaction with NaOH

A) Zn

B) Ca

C) Mg

D) Na

View Answer

A) Zn
Explanation:Zinc (Zn) reacts with NaOH to liberate hydrogen gas:
$Zn + 2NaOH → Na_2ZnO_2 + H_2$

Answer:Zn

97)Which of the following can’t be used as X in the equation given below?

A) Metal hydrogen carbonates

B) Metal carbonates

C) Both (1) and (2)

D) Metal hydroxides

View Answer

C) Both (1) and (2)
Explanation:The correct answer is D. Metal hydroxides.
Explanation:
The given reaction is:
$\text{Acid} + X ⇒ \text{Salt} + CO_2 + \text{water}$

Let’s analyze each option:
– 1. A. Metal hydrogen carbonates (e.g., NaHCO₃)
– Reaction:
$\text{HCl} + \text{NaHCO}_3 ⇒ \text{NaCl} + CO_2 + H_2O$

– Valid, as this produces $CO_2$

.
– 2. B. Metal carbonates (e.g., Na₂CO₃)
– Reaction:
$2\text{HCl} + \text{Na}_2\text{CO}_3 ⇒ 2\text{NaCl} + CO_2 + H_2O$

– Valid, as this also produces $CO_2$

.
– 3. C. Both (1) and (2)
– Since both A and B are valid, this option is incorrect for the question (which asks for what can’t be used).
– 4. D. Metal hydroxides (e.g., NaOH)
– Reaction:
$\text{HCl} + \text{NaOH} ⇒ \text{NaCl} + H_2O$

– Does not produce $CO_2$

.
– Hence, this is the correct answer because it cannot be used to produce $CO_2$

.
Conclusion:
Only metal hydroxides (D) do not produce $CO_2$

when reacting with acids, making them the correct choice for what can’t be used in the given reaction.

98)Tooth enamel is made up with

A) calcium hydroxide

B) calcium phosphate

C) calcium oxide

D) calcium carbonate

View Answer

B) calcium phosphate
Explanation:Tooth enamel is made of calcium phosphate (hard mineral in teeth).
Answer:calcium phosphate

99)What is the pH of the salt formed from weak acid and strong base?

A) 3

B) 9

C) 7

D) 5

View Answer

B) 9
Explanation:Weak acid + strong base → basic salt → pH > 7, typically \~9
Answer:9

100)Who among the following did not propose atomic model?

A) Planck

B) Schrodinger

C) Bohr

D) Sommerfeld

View Answer

A) Planck
Explanation:Planck proposed quantum theory (energy quanta), but not an atomic modelOthers proposed atomic structure models
Answer:Planck

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