JEE Main Test 115

Result

JEE Main Test 115

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Weekly Quiz Competition

Question 1
4 / -1

If the foci of an ellipse are (± √5, 0) and its eccentricity is √5/3, then the equation of the ellipse is

A
9x² + 4y² = 36

B
4x² + 9y² = 36

C
36x² + 9y² = 4

D
9x² + 36y² = 4

Solution
Question 2
4 / -1

∆E° of combustion of iso-butylene is -X kJ mol ^-1 . The value of ∆H° is

A
= ∆E°

B
> ∆E°

C
= 0

D
< ∆E°

Solution
Question 3
4 / -1

The incorrect expression among the following is

A

B

C

D

Solution
Question 4
4 / -1

In Goldschmidt aluminothermic process, thermite contains

A
3 parts of A₂O₃ and 4 parts of Al

B
3 parts of Fe₂O₃ and 2 parts of Al

C
3 parts of Fe₂O₃ and 1 part of Al

D
1 part of Fe₂O₃ and 1 part of Al

Solution

Aluminothermic reactions are exothermic chemical reactions using aluminium as the reducing agent at high temperature. The process is industrially useful for production of alloys of iron. The most prominent example is the thermite reaction between aluminium and iron oxide in the ratio 3:1.
Question 5
4 / -1

A

B

C

D

Solution

Silicate mineral with silica tetrahedra linked by shared oxygens into infinite one-dimensional chains . Single chains characterize pyroxens; double chains characterize amphiboles and wider chains grade towards sheet structure. Hence they have silicate structure unit of
Question 6
4 / -1

0.1 mole of CH₃NH₂ (K_b = 5 × 10^-4) is mixed with 0.08 mole of HCl and diluted to 1L. What will be the H⁺ concentration in the solution ?

A
8 × 10^-2 M

B
8 × 10^-11 M

C
1.6 × 10^-11 M

D
8 × 10^-5 M

Solution
Question 7
4 / -1

Which of the following exists as covalent crystals in the solid state ?

A
Iodine

B
Silicon

C
Sulphur

D
Phosphorus

Solution

Iodine, sulphur and phosphorus exists as I₂, S₆ and P₄ respectively. Silicion does exist as covalent crystal in the solid state, because in silicon, constituent particles are bonded together by covalent bons.
Question 8
4 / -1

Lassaigne's test for the detection of nitrogen fails in

A
H₂N-CO-NHNH₂ • HC1

B
NH₂ -NH₂ • HCl

C
NH₂ -CO-NH₂

D
C₆H₅ -NH-NH₂ • HCl

Solution

NH₂ – NH₂ – HCl does not give Lassaigne’s test as it does not contains carbon. Lassaigne’s test is given by only those nitrogenous compounds in which both carbon and nitrogen is present
Question 9
4 / -1

In which of the following pairs, the constants/ quantities are not mathematically related to each other?

A
Gibbs free energy and standard cell potential

B
Equilibrium constant and standard cell potential

C
Rate constant and activation energy

D
Rate constant and standard cell potential

Solution
Question 10
4 / -1

A reaction was observed for 15 days and the percentage of the reactant remaining after the days indicated was recorded in the following table.

A
Reaction order = First, Half-life (days) = 2

B
Reaction order = First, Half-life (days) = 6

C
Reaction order =Second, Half-life (days) = 2

D
Reaction order = zero, Half-life (days) = 6

Solution