List of practice Questions

Solute ‘X’ dimerises in water to the extent of 80%.2.5g of ‘X’ in 100g of water increases the boiling point by 0.3∘C. The molar mass of ‘X’ is [Kb​=0.52Kkgmol−1]
The standard deviation of the data 6, 7, 8, 9, 10 is
The negation of the statement “For all real numbers x and y, x + y = y + x” is
\(\lim\limits_{x\rightarrow0}(\frac{\tan x}{\sqrt{2x+4}-2})\) is equal to
If the parabola x2 = 4ay passes through the point (2, 1), then the length of the latus rectum is
The two lines lx + my = n and l'x + m'y = n' are perpendicular if
If the sum of n terms of an A.P is given by Sn = n2 + n, then the common difference of the A.P is
Which one of the following is an isotonic pair of solution ?
The pair of electrolytes that posses same value for the constant (A) in the Debye - Huckel - Onsagar equation, $\lambda_m = \lambda^0_m - A\sqrt{C}$ is
Silicon doped with gallium forms
A metal crystallises in face centred cubic structure with metallic radius 2​A∘. The volume of the unit cell (in m3) is
A metal exists as an oxide with formula M0.96​O. Metal M can exist as M+2 and M+3 in its oxide M0.96​O. The percentage of M+3 in the oxide is nearly
Which of the following is Not a green house gas?
Identify ‘X’ in the following reaction
Identify X in the following reaction
Which of the following is not a pair of functional isomers?
The mental that produces H2 with both dil HC/ and NaOH (aq) is
The oxide of potassium that does not exist is
The percentage s-character of the hybrid orbitals in\( No^+_2\), \(NO^-_3\) and\( NH^+_4\) respectively are
A Lewis acid 'X' formed by the reaction of BF3 with LiA/H4 in ether medium to gives a highly toxic gas. This gas when heated with NH3 gives a compound commonly known as inorganic benzene. The gas is
The oxidation number of nitrogen atom in MH4NO3 are
When the same quantity of heat is absorbed by a system at two different temperatures T1​ and T2​, such that T1​>T2​, change in entropies are ΔS1​ and ΔS2​ respectively. Then
The formal charge on central oxygen atom in ozone is
A thin uniform rectangular plate of mass 2 kg is placed in X-Y plane as shown in figure. The moment of inertial about x-axis is Ix = 0.2 kg m2 and the moment of inertia about y-axis is Iy = 0.3 kg m2. The radius of gyration of the plate about the axis passing through O and perpendicular to the plane of the plate is
A thin uniform rectangular plate of mass 2 kg
A body is initially at rest. It undergoes one-dimensional motion with constant acceleration. The power delivered to it at time ‘t’ is proportional to
One end of a string of length ‘ l ’ is connected to a particle of mass ‘m’ and the other to a small peg on a smooth horizontal table. If the particle moves in a circle with speed ‘v’, the net force on the particle (directed towards the centre) is : (T is the tension in the string)