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In CsCl type structure, the coordination number of Cs+ is Cl- respectively are:

(A) 6,6 (B) 6,8 (C) 8,6 (D) 8,8 The Correct Answer is (D) 8,8 Solution: In Cesium chloride [CsCl], caesium ions form a simple cubic... View Article

Which of the following configurations is associated with the biggest jump between 2nd and 3rd I.E.?

(A) 1s2, 2s2, 2p1 (D) (B) 1s2, 2s2, 2p2 (A) (C) 1s2, 2s2, 2p6, 3s1 (B) (D) 1s2, 2s2, 2p6, 3s2 (C) The Correct Answer is (D) 1s2, 2s2,... View Article

An organic compound contains carbon, hydrogen and oxygen. Its elemental analysis gave C, 38.71% and H, 9.67%. What would be the empirical formula of the compound?

(A) CHO (B) CH2O (C) CH3O (D) CH4O The Correct Answer is (C) CH3O Solution: The empirical formula is to be calculated as:... View Article

Assertion: Both Frenkel and Schottky defects are stoichiometric defects. Reason: Both defects change the density of the crystalline solid.

(A) Both Assertion and Reason are false. (B) Assertion is true, but Reason is false. (C) Both Assertion and Reason are true. The reason is... View Article

Lithium forms body centred cubic structure. The length of the side of its unit cell is 351 pm. What will be the Atomic radius of lithium?

(A) 152 pm (B) 175 pm (C) 240 pm (D) 300 pm The Correct Answer is (A) 152 pm. Solution: For body centred cubic (bcc) structure, radius =... View Article

The rate constant for a chemical reaction taking place at 500k is expressed as k = A.e-1000. The activation energy (Ea) of the reaction is:

(A) 100 Kcal (B) 1000 Kcal (C) 10000 Kcal (D) 100000 Kcal The Correct Answer is (B) 1000 Kcal Solution: Explore more such... View Article

What is the oxidation number of carbon in carbon suboxide [C3O2]?

(A) 2 (B) 2/3 (C) 4/3 (D) 10/3 The Correct Answer is (C) 4/3 Solution: The structure of carbon suboxide [C3O2] is O = C = C = C = O.... View Article

Which of the following compounds can be used as antifreeze in automobile radiators?

(A) Glycol (B) Nitrophenol (C) Ethyl alcohol (D) Methyl alcohol The Correct Answer is (A) Glycol. Solution: Glycol can be used as... View Article

Which of the following compounds have higher boiling points?

(A) 1-chlorobutane (B) 1-chloropropane (C) Isopropyl Chloride (D) All of these The Correct Answer is (A) 1-chlorobutane. Solution:... View Article

The distance between an octahedral and tetrahedral void in fcc lattice is:

(A) (B) (C) (D) The Correct Answer is (C) . Solution: The tetrahedral voids are present at \frac{a\sqrt{3}}{4} from the body corner... View Article

How many pi bonds are present in the molecule of CH3 – CH = CH – C = CH?

(A) 2 bonds (B) 3 bonds (C) 8 bonds (D) 9 bonds The Correct Answer is (B) 3 bonds Solution: There are three bonds present... View Article

How many sigma bonds are present in the molecule of dicyanoethene (CN−CH=CH−CN)?

(A) 2 sigma bonds (B) 3 sigma bonds (C) 5 sigma bonds (D) 7 sigma bonds The Correct Answer is (D) 7 sigma bonds Solution: The structure of... View Article

An element with the atomic number 19 will most likely combine chemically with the element whose atomic number is :

(A) 11 (B) 17 (C) 18 (D) 20 The Correct Answer is (B) 17 Solution: An element with the atomic number 19 will most likely combine chemically... View Article

Assertion: PF5, SF6 and H2SO4 are examples of expanded octet molecules.Reason: Octet rule is not applicable to the second-period elements of the periodic table.

(A) Both Assertion and Reason are false. (B) Assertion is true, but Reason is false. (C) Both Assertion and Reason are true. The reason is... View Article

Assertion: HNO3 is a stronger acid than HNO2. Reason: In HNO3 there are two nitrogen to oxygen bonds whereas in HNO2 there is only one.

(A) Both Assertion and Reason are false. (B) Assertion is true, but Reason is false. (C) Both Assertion and Reason are true. The reason is... View Article

Which of the following oxide of iodine is used in the estimation of carbon monoxide?

(A) I2O4 (B) I2O5 (C) I2O6 (D) I2O7 The Correct Answer is (B) I2O5 Solution: Iodine peroxide [ I2O5] is used in the estimation of carbon... View Article

Which of the following oxoanions contains all equivalent M−O bonds?

(A) (B) (C) (D) Both (A) and (B) The Correct Answer is (D) Both (A) and (B) Solution: (A) In the permanganate ion, all the Mn − O... View Article

Calculate the ratio of energies of 2nd orbits of H, He+ and Li+2.

(A) 1 : 4 : 9 (B) 2 : 4 : 9 (C) 3 : 6 : 9 (D) 4 : 8 : 9 The Correct Answer is (A) 1: 4: 9 Solution: The energy of electrons in... View Article

Silver crystallises in the fcc lattice. If the edge length of the cell is 4.07 * 10-8 cm and density is 10.5 g cm-3.Calculate the atomic mass of metal.

Solution: As we know: Density (D) = Given: Density (D) = 10.5 g cm-3 Number of atoms per unit cell (Z) = 4 Atomic mass (M)=? Avogadro's... View Article

The molar specific heat at a constant pressure of an ideal gas is (7/2) R. The ratio of specific heat at constant pressure to that at constant volume is:

(A) 5/7 (B) 7/5 (C) 8/7 (D) 9/7 The Correct Answer is (B) 7/5 Solution: Therefore r = Explore more such questions and answers at BYJU'S.... View Article

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