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Heptane and octane form an ideal solution. At 373 K, the vapour pressures of the two liquid components are 105.2 kPa and 46.8 kPa respectively. What will be the vapour pressure of a mixture of 26.0 g of heptane and 35 g of octane?

Vapour pressure of heptanes, = 105.2 kPa Vapour pressure of octane, = 46.8 kPa We know that, Molar mass of heptanes (C7H16) = 7 x... View Article

Which of the following statements in relation to the hydrogen atom is correct? (a) 3s, 3p and 3d orbitals all have the same energy (b) 3s and 3p orbitals are of lower energy than 3d orbital (c) 3p orbital is lower in energy than 3d orbital (d) 3s orbital is lower in energy than 3p orbital

The correct answer is (d) 3s orbital is lower in energy than 3p orbital In a hydrogen atom, 3s,3p and 3d orbitals will have same energy. In... View Article

A ball moving with velocity 2m/s collides head on with another stationary ball of double the mass. If the coefficient of restitution is 0.5, then their velocities (inm/s) after collision will be (a) 0,1 (b) 1,1 (c) 1, 0.5 (d) 0,2

The correct answer is (a) 0,1 As per the given data m1 = m, m2 = 2m u1= 2 m/s u2 = 0 Coefficient of restitution, e = 0.5 Find... View Article

A train overtakes two persons who are walking in the same direction in which the train is going, at the rate of 2 kmph and 4 kmph and passes them completely in 9 and 10 second respectively. The length of the train is. (1) 45 metres (2) 40 metres (3) 54 metres (4) 50 metres

The correct answer is (4) 50 metres Let the length of train be x km Let the speed of the train be y km/hr 2 kmph = (2 x 5/18) m/sec =... View Article

The electrons identified by quantum numbers n and l, (i) n=4,l=1, (ii) n=4,l=0 (iii) n=3,l=2 and (iv) n=3,l=1 can be placed in order of increasing energy as (a) (i) < (ii) < (iii) < (iv) (b) (iv) < (iii) < (ii) < (i) (c) (iv) < (ii) < (iii) < (i) (d) (iv) < (i) < (ii) < (iii)

The correct answer is (c) (iv) < (ii) < (iii) < (i) Solution The greater is the value of (n+l), the greater is the energy... View Article

What is number system?

A number system is defined as a system of writing to express numbers. It is the mathematical notation for representing numbers of a given set by... View Article

In a town of 10,000 families, it was found that 40% of the families buy newspaper A, 20% buy newspaper B, 10% buy newspaper C, 5% buy A and B; 3% buy B and C, and 4% buy A and C. IF 2% buy all the three newspapers, find the number of families which buy (i) A only, (ii) B only, (iii) none of A, B, and C.

Given Total number of families = 10000 Percentage of families that buy newspaper A = 40 Percentage of families that buy newspaper B = 20... View Article

Lattice energy of an ionic compound depends upon (a) charge on the ion only (b) size of the ion only (c) packing of the ion only (d) charge and size of the ion.

The correct answer is (d) charge and size of the ion. Lattice energy can be defined as the energy required to convert one mole of an... View Article

Cyanide process is used in the extraction of (a) gold (b) silver (c) both of these (d) none of these

The correct answer is (c) both of these The cyanide process is used for the extraction of Au and Ag from their ores by dissolving them in a... View Article

The species having pyramidal shape is:(A) SO₃
(B) BrF₃
(C) SiO₃²⁻(D) OSF₂

The correct answer is (D) OSF2 From VSEPR theory we get to know that SO2 is sp2 hybridized with three bond pairs and... View Article

The 0° Meridian is also known as_________

The 0° Meridian is also known as Prime Meridian. Let us know more about prime meridian The meridian which passed through... View Article

Suppose the charge of a proton and an electron differ slightly. One of them is -e, the other is (e + Δe). If the net of electrostatic force and the gravitational force between two hydrogen atoms placed at a distance d (much greater than atomic size) apart is zero, then Δe is of the order of [Given: mass of hydrogen m_h = 1.67 x 10-27 kg] (a) 10^-23 C (b) 10^-37 C (c) 10^-47 C (d) 10^-20 C

The correct answer is (d) 10-20 C mh=1.67×10−27kg The net charge on hydrogen atom q=(e+Δe)−e=Δe Let... View Article

Between 1 and 31, m numbers have been inserted in such a way that the resulting sequence is an A.P. and the ratio of 7th and (m – 1)th numbers is 5: 9. Find the value of m.

An arithmetic sequence or progression is defined as a sequence of numbers in which for every pair of consecutive terms, the second number is... View Article

M	T	W	T	F	S	S
	1	2	3	4	5	6
7	8	9	10	11	12	13
14	15	16	17	18	19	20
21	22	23	24	25	26	27
28

Archives

Heptane and octane form an ideal solution. At 373 K, the vapour pressures of the two liquid components are 105.2 kPa and 46.8 kPa respectively. What will be the vapour pressure of a mixture of 26.0 g of heptane and 35 g of octane?

Which of the following statements in relation to the hydrogen atom is correct? (a) 3s, 3p and 3d orbitals all have the same energy (b) 3s and 3p orbitals are of lower energy than 3d orbital (c) 3p orbital is lower in energy than 3d orbital (d) 3s orbital is lower in energy than 3p orbital

A ball moving with velocity 2m/s collides head on with another stationary ball of double the mass. If the coefficient of restitution is 0.5, then their velocities (inm/s) after collision will be (a) 0,1 (b) 1,1 (c) 1, 0.5 (d) 0,2

A train overtakes two persons who are walking in the same direction in which the train is going, at the rate of 2 kmph and 4 kmph and passes them completely in 9 and 10 second respectively. The length of the train is. (1) 45 metres (2) 40 metres (3) 54 metres (4) 50 metres

The electrons identified by quantum numbers n and l, (i) n=4,l=1, (ii) n=4,l=0 (iii) n=3,l=2 and (iv) n=3,l=1 can be placed in order of increasing energy as (a) (i) < (ii) < (iii) < (iv) (b) (iv) < (iii) < (ii) < (i) (c) (iv) < (ii) < (iii) < (i) (d) (iv) < (i) < (ii) < (iii)

What is number system?

Lattice energy of an ionic compound depends upon (a) charge on the ion only (b) size of the ion only (c) packing of the ion only (d) charge and size of the ion.

Cyanide process is used in the extraction of (a) gold (b) silver (c) both of these (d) none of these

The species having pyramidal shape is:(A) SO₃
(B) BrF₃
(C) SiO₃²⁻(D) OSF₂

The 0° Meridian is also known as_________

Between 1 and 31, m numbers have been inserted in such a way that the resulting sequence is an A.P. and the ratio of 7th and (m – 1)th numbers is 5: 9. Find the value of m.

If α and β are the roots of the equation ax2 + bx + c = 0, then α / [ɑβ + b] + β / [aɑ + b] =

How many months have 31 days?

What are the componenets of a vector?

What are consecutive numbers

What is Pi?

The time shown in mirror placed in front of clock at 6 :20 is___

Name a molecule with zero dipole moment

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