Some Basic Concepts of Chemistry JEE Main 2026 (January) Question Bank
Questions with Answer Keys MathonGo
Q1. JEE Main 2026 (21 January Shift 2)
Aqueous HCl reacts with MnO 2( s) to form MnCl 2(aq), Cl2( g) and H 2O(l). What is the weight (in g) of Cl 2
liberated when 8.7 g of MnO 2( s) is reacted with excess aqueous HCl solution?
(Given Molar mass in gmol −1
Mn = 55, Cl = 35.5, O = 16, H = 1 )
(1) 21.3 (2) 71 (3) 14.2 (4) 7.1
Q2. JEE Main 2026 (28 January Shift 2)
For the given reaction:
CaCO3 + 2HCl ⟶ CaCl2 + H2O + CO2
If 90 gCaCO is added to 300 mL of HCl which contains 38.55%HCl by mass and has density 1.13 g mL , then
3
−1
which of the following option is correct ?
Given molar mass of H, Cl, Ca and O are 1, 35.5, 40 and 16 g mol −1
respectively.
(1) 64.97 g of HCl remains unreacted
(2) 60.32 g of HCl remains unreacted
(3) 97.30 g of HCl reacted
(4) 32.85 g of CaCO remains unreacted
3
Q3. JEE Main 2026 (22 January Shift 2)
A + 2 B ⟶ AB2
36.0 g of 'A' (Molar mass: 60 g mol ) and 56.0 g of ' B (Molar mass: 80 g mol ) are allowed to react. Which of
−1 ′ −1
the following statements are correct ?
A. 'A' is the limiting reagent.
B. 77.0 g of AB is formed.
2
C. Molar mass of AB is 140 g mol .
2
−1
D. 15.0 g of A is left unreacted after the completion of reaction.
Choose the correct answer from the options given below :
(1) C and D Only (2) A and B Only
(3) A and C Only (4) B and D Only
Q4. JEE Main 2026 (22 January Shift 1)
In the reaction,
3+ −
2Al(s) + 6HCl(aq) → 2Al (aq) + 6Cl (aq) + 3H2( g)
(1) 11.2 LH 2( g) at STP is produced for every mole of HCl consumed.
(2) 33.6 LH 2( g) is produced regardless of temperature and pressure for every mole of Al that reacts.
(3) 12 LHCl(aq) is consumed for every 6 LH 2( g) produced.
(4) 67.2 LH 2( g) at STP is produced for every mole of Al that reacts.
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Questions with Answer Keys MathonGo
Q1. JEE Main 2026 (21 January Shift 2)
Aqueous HCl reacts with MnO 2( s) to form MnCl 2(aq), Cl2( g) and H 2O(l). What is the weight (in g) of Cl 2
liberated when 8.7 g of MnO 2( s) is reacted with excess aqueous HCl solution?
(Given Molar mass in gmol −1
Mn = 55, Cl = 35.5, O = 16, H = 1 )
(1) 21.3 (2) 71 (3) 14.2 (4) 7.1
Q2. JEE Main 2026 (28 January Shift 2)
For the given reaction:
CaCO3 + 2HCl ⟶ CaCl2 + H2O + CO2
If 90 gCaCO is added to 300 mL of HCl which contains 38.55%HCl by mass and has density 1.13 g mL , then
3
−1
which of the following option is correct ?
Given molar mass of H, Cl, Ca and O are 1, 35.5, 40 and 16 g mol −1
respectively.
(1) 64.97 g of HCl remains unreacted
(2) 60.32 g of HCl remains unreacted
(3) 97.30 g of HCl reacted
(4) 32.85 g of CaCO remains unreacted
3
Q3. JEE Main 2026 (22 January Shift 2)
A + 2 B ⟶ AB2
36.0 g of 'A' (Molar mass: 60 g mol ) and 56.0 g of ' B (Molar mass: 80 g mol ) are allowed to react. Which of
−1 ′ −1
the following statements are correct ?
A. 'A' is the limiting reagent.
B. 77.0 g of AB is formed.
2
C. Molar mass of AB is 140 g mol .
2
−1
D. 15.0 g of A is left unreacted after the completion of reaction.
Choose the correct answer from the options given below :
(1) C and D Only (2) A and B Only
(3) A and C Only (4) B and D Only
Q4. JEE Main 2026 (22 January Shift 1)
In the reaction,
3+ −
2Al(s) + 6HCl(aq) → 2Al (aq) + 6Cl (aq) + 3H2( g)
(1) 11.2 LH 2( g) at STP is produced for every mole of HCl consumed.
(2) 33.6 LH 2( g) is produced regardless of temperature and pressure for every mole of Al that reacts.
(3) 12 LHCl(aq) is consumed for every 6 LH 2( g) produced.
(4) 67.2 LH 2( g) at STP is produced for every mole of Al that reacts.
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