Class 11th

Class 11th Organic Chemistry - Some Basic Principles and Tech

Contributor-Level 10

Kindly go through the solution

Moles of O? = 5

0 0

New question posted

2 months ago

0 Follower 4 Views

New answer posted

2 months ago

For some θ ∈ (0, π/2), if the eccentricity of the hyperbola x² - y²sec²θ = 10 is √5 times the eccentricity of the ellipse x²sec²θ + y² = 5, then the length of the latus rectum of the ellipse is

0 Follower 3 Views

Contributor-Level 9

Kindly consider the following Image

0 0

New answer posted

2 months ago

lim(x→0) (tan(π/4 + x))¹/? is equal to

0 Follower 1 View

Contributor-Level 9

lim (x?0) (tan (? /4+x)¹/? = e^ (lim (x?0) (tan (? /4+x)-1)/x)
= e^ (lim (x?0) (2tanx/ (1-tanx)/x) = e².

0 0

New answer posted

2 months ago

If the sum of first 11 terms of an A.P. a?, a?, a?, . is 0 (a? ≠ 0), then the sum of the A.P. a?, a?, a?, ., a? is ka?, where k is equal to

0 Follower 3 Views

Class 11th Ncert Solutions Maths class 11th

Contributor-Level 9

S? =0 ⇒ (a? +a? ) (11/2)=0 ⇒ a? =-a?
2a? +10d=0 ⇒ a? =-5d.
Sum = a? +a? +.+a? = (a? +a? ) (12/2) = 6 (2a? +22d)
= 6 (2a? +22 (-a? /5) = 6 (2a? -22a? /5) = 6 (-12a? /5)=-72a? /5. k=-72/5.

0 0

New answer posted

2 months ago

Let f(x) be a quadratic polynomial such that f(-1) + f(2) = 0. If one of the roots of f(x)=0 is 3, then its other root lies in

0 Follower 2 Views

Contributor-Level 9

f (x)=a (x-3) (x-α)
f (2)=a (2-α)
f (-1)=a (-4) (-1-α)=4a (1+α)
f (-1)+f (2)=0 ⇒ a (2-α+4+4α)=0 ⇒ a≠0 ⇒ 5α=-2 ⇒ α=-0.4
α ∈ (-1,0)

0 0

New answer posted

2 months ago

If the equation cos?θ + sin?θ + λ = 0 has real solutions for θ, then λ lies in the interval

0 Follower 3 Views

Contributor-Level 9

λ=- (sin? θ+cos? θ) = - (sin²θ+cos²θ)²-2sin²θcos²θ)
λ = - (1-½sin²2θ) = ½sin²2θ-1
sin²2θ ∈
λ ∈ [-1, -1/2]

0 0

New answer posted

2 months ago

Class 11th Redox Reactions

If you spill a chemical toilet cleaning liquid on your hand, your first aid would be:

0 Follower 1 View

Contributor-Level 10

Toilet cleaner is acidic (HCl). Neutralize with weak base NaHCO?

0 0

New answer posted

2 months ago

Class 11th Chemistry

Three elements X, Y and Z are in the 3rd period of the periodic table. The oxides of X, Y and Z, respectively, are basic, amphoteric and acidic. The correct order of the atomic numbers of X, Y and Z is:

0 Follower 3 Views

Contributor-Level 10

On moving left to right in a period.

Acidic character of oxides is increase.

3rd period element oxides.

0 0

New answer posted

2 months ago

Class 11th Chemistry

Two elements A and B have similar chemical properties. They don't form solid hydrogencarbonates, but react with nitrogen to form nitrides. A and B, respectively, are:

0 Follower 1 View