Question 1 of 10

On a humid day in summer, the mole fraction of gaseous H₂O (water vapour ) in the air at 25° C can be as high as 0.0287. Assuming the total pressure of 0.977 atm, what is the partial pressure of dry air ?

Question 2 of 10

A binary compound of elements X and Y contains 50% of X. If the atomic masses of X and Y are 10 and 20 and the molecular mass of the compound is 120, the molecular formula of the compound is

Question 3 of 10

A needle made of bismuth is suspended freely in a magnetic field. The angle which the needle makes with the magnetic field is

Question 4 of 10

If n(A) = 4, n(B) = 3, n ( A✗ B ✗ C) = 24, then n(C) is equal to

Question 5 of 10

If X = , then Xⁿ, for n ∈ N is equal to

Question 6 of 10

A

B

C

Dall of the above

Enone of these

Question 7 of 10

Which substance serves as a reducing agent in the following reaction, {tex}14H^{+} + Cr_2O^{2-}_7 + 3Ni \rightarrow 2Cr^{3+} + 7H_2O + 3Ni^{2+}{/tex}

Question 8 of 10

If α, β, γ are the angles made by a straight line with the coordinate axes, then sin²α+sin²β+sin²γ is

Question 9 of 10

Question 10 of 10

The angle of minimum deviation in an equilateral prism of refractive index 1.414 is