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Aqua regia is used for dissolving noble metals (Au, Pt, etc.). The gas evolved in this process is

1) N2O3 2) N2 3) N2O5 4) NO Solution: (4)

Which one of the following compounds possesses the most acidic hydrogen?

Which one of the following compounds possesses the most acidic hydrogen? Solution: (3) has most acidic hydrogen among given compounds,... View Article

The complex that can show optical activity is

1) cis– [CrCl2 (ox)2]3- (ox – oxalate) 2) trans – [Fe (NH3)2 (CN)4]– 3) trans – [Cr (Cl2) (ox)2]3- 4)... View Article

If the boiling point of H₂O is 373 K, the boiling point of H₂S will be

1) greater than 300 K but less than 373 K 2) equal to 373 K 3) more than 373 K... View Article

The Kjeldahl method of Nitrogen estimation fails for which of the following reaction products

The Kjeldahl method of Nitrogen estimation fails for which of the following reaction products? 1) (a), (c) and (d) 2)... View Article

An acidic buffer is obtained on mixing

1) 100 mL of 0.1 M HCl and 200 mL of 0.1 M CH3COONa 2) 100 mL of 0.1 M... View Article

The total number of numbers, lying between 100 and 1000 that can be formed with the digits 1, 2, 3, 4,5, if the repetition of digits is not allowed and numbers are divisible by either 3 or 5 is

The numbers either divisible by either 3 or 5 are

Let a = i + 2 j – k, b = i – j and c = i – j – k be three given vectors.

Question: Let \(\begin{array}{l}\vec{a} = \hat{i} + 2 \hat{j} – \hat{k}, \vec{b} = \hat{i} – \hat{j}\end{array} \) and \(\begin{array}{l}\vec{c} = \hat{i}... View Article

If the system of equations:kx + y + 2z = 1,3x – y – 2z = 2 and -2x – 2y – 4z = 3 has infinitely many solutions, then k is equal to __________

D = D1 = D2 = D3 = 0 Choose D2 = 0 k(–8+6)–1(–12–4)+2(9+4)=0 –2k + 16 + 26 =... View Article

Let f(x) be a polynomial of degree 6 in x, in which the coefficient of x⁶ is unity and it has extrema at x = –1 and x = 1. If [latex]lim_{x to 0}frac{f(x)}{x^3}=1[/latex], then 5.f(2) is equal to

f(x) = x6 + ax5 + bx4 + x3 f’(x) = 6x5 + 5ax4 + 4bx3 + 3x2 Roots 1... View Article

The locus of the point of intersection of the lines (√3)kx + ky – 4√3 = 0 and √3x – y – 4√3 k = 0 is a conic, whose eccentricity is _________.

Solution: (√3)kx + ky – 4√3 = 0 …(1) √3kx -ky= 4√3 k2 …(2) Adding equation (1) & (2) 2√3... View Article

The graphs of sine and cosine functions, intersect each other at a number of points and between two consecutive points of intersection, the two graphs enclose the same area A. Then A⁴ is equal to ___________

The graphs of sine and cosine functions, intersect each other at a number of points and between two consecutive points... View Article

If the curves, [latex]frac{x^2}{a}+frac{y^2}{b}[/latex] and [latex]frac{x^2}{c}+frac{y^2}{d}[/latex] intersect each other at an angle of 90°, then which of the following relations is true ?

a. a + b = c + d b. a- b = c – d c. ab = (c+d)/(a+b) d.... View Article

The image of the point (3,5) in the line x – y + 1 = 0, lies on :

a. (x – 2)2 + (y – 4) 2 =4 b. (x – 4) 2 + (y + 2)2 =16... View Article

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