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Isotonic solutions are solutions having the same? (A) Surface tension (B) Vapour pressure (C) Osmotic pressure (D) Viscosity

Answer: (C) Isotonic solutions, in general, are those that have equal concentrations of impermeable solutes on both sides of the membrane,... View Article

Sulphide ore among the following is a) Al, Hg, Pb, F b) Fe, Zn, Pb c)Hg, Pb, Na d) F, Ca, Cu, Mg

Answer: (b) Sulphide ores are mostly made up of sulphide ions. They are incredibly cost-effective and simple to remove from the rocks.... View Article

In a cubic lattice, the closed packed structure of mixed oxides of the lattice is made up of oxide ions, one eight of the tetrahedral voids by divalent ions (A²⁺) while one half of the octahedral voids are occupied by trivalent ions (B³⁺). What is the formula of the oxides?

One eight of the tetrahedral voids by divalent ions (A2+). One half of the octahedral voids are made up by trivalent ions (B3+). The lattice... View Article

why is lithium the strongest reducing agent

Answer: Large amount of hydration energy makes it the strongest reducing agent inspite of its highest ionisation enthalpy. The ionisation... View Article

A cylinder contains hydrogen gas at pressure of 249kPa and temperature 27degreeC. Its density is : (R=8.3J mol−1K−1)

We know that PV = nRT ∴ PV = (Mm)RT PM = m/VRT ρ = PM/RT ρ = 249 × 103 × 2 × 10−3/8.3 × 300 ρ = 0.2kg/m3... View Article

The number of tetrahedral and octahedral voids in FCC unit cells are respectively.

The face-centered cubic unit cell is known to include atoms in both the corners and the centre of the cube. Then, as the question suggests, we... View Article

n identical cubes each of mass m and edge L are lying on a floor. If the cubes are to be arranged as one over the other in a vertical stack, the work to be done is:

The potential energy U of a body of mass m at a height h above some reference point is given as U=mgh --(1) Where g is the acceleration due to... View Article

Consider a wedge of mass 2m and a cube of mass m . Between the cube and wedge, there is no friction. The minimum coefficient of friction between the wedge and the ground so that the wedge doesn’t move is

The coefficient of friction is represented as μ. The frictional force is divided into horizontal and vertical components. Those are λsinθ and... View Article

The breakdown in a reverse biased p-n junction diode is more likely to occur due to.

If the doping concentration is low, the breakdown in a reverse biassed PN junction diode will most likely occur due to the buildup of the greater... View Article

A ring rotates about the z axis as shown in the figure. The plane of rotation is x-y. At a certain instant, the acceleration of a particle P is (6hat{i}−8hat{j})ms⁻² . Find the angular acceleration of the ring and the angular velocity at that instant. Radius of the ring is 2m

Tangential acceleration refers to the force acting along the tangent. This is commonly referred to as at. The magnitude is given by at=R, where R... View Article

What is equivalent weight in chemistry?

The amount of substances that completely react with each other in the reaction is called equivalent weight in chemistry. Equivalent weight =... View Article

An aqueous solution of methanol in water has vapour pressure: A) Equal to that of water B) Equal to that of methanol C) More than that of water D) Less than that of water

Raoult’s Law states that in a solution, the partial vapour pressure of each volatile compound is directly proportional to its mole fraction in... View Article

The resistance in the two arms of the meter bridge are 5 Ω and R Ω , respectively. When the resistance R is shunted with an equal resistance, the new balance point is at1.6l1. The resistance R is

Known resistance, R = 5Ω Initial unknown resistance = RΩ New balancing point L = 1.6l1 We have, R/L = S/100−L--------- 1 Where, R is... View Article

A particle of charge q and mass m moves in a circular orbit of radius r with angular speed ω. The ratio of the magnitude of its magnetic moment to that of its angular momentum depends on

The angular momentum L of the particle is given by L=mr2w where w=2πn. ∴ Frequency n = w/2π Further i = q × n = wq/2π Magnetic Moment, M =... View Article

For an object projected from the ground with speed u, horizontal range is two times the maximum height attained by it. The horizontal range of the object is:

Here, we will use the relation between the horizontal range R, acceleration due to gravity g, initial speed u and the maximum height H, which is... View Article

pH of a saturated solution of Ba(OH)₂ is 12 . The value of Ksp is:

We know that pH for barium hydroxide is 12 . So, pOH = 14−pH pOH = 14−12 pOH = 2 Using the formula, pOH = 14 − 12=−log[OH−] 2 = − log[OH−]... View Article

A boat, which has a speed of 5km/h in still water, crosses a river of width 1km along the shortest path possible in 15 minutes. Find the velocity of the river?

Speed in still water is 5 km/h Let the velocity of the river be m km/h Width of the river is 1 km and time taken is 15 minutes, that is 14... View Article

Which hydrogen halide is most volatile?

Answer: HCl The volatility of the hydrogen halides can be compared on the basis of the size of the halides as, on moving down the group, the... View Article

A parallel plate capacitor stores a charge Q at voltage V. Suppose the area of the capacitor and the distance between the plates are each doubled then which is the quantity that will change?

Given, the charge stored by the capacitor is Q and voltage is V. Let the capacitance of the capacitor is C. The capacitance of a parallel plate... View Article

Which gas is absorbed in turpentine oil?

Ozone is absorbed in turpentine oil due to its oxidizing property.The properties of ozone and oxygen molecules are entirely different. When the... View Article

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