A solid has a BCC structure. If the distance of the nearest approach between two atoms is 1.73 A. What would be the edge length of the cell?
(A) 141 pm (B) 200 pm (C) 216 pm (D) 314.20 pm The Correct Answer is (B) 200 pm. Solution:... View Article
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Assertion: The elements with electronic configuration [xe]54 4f1 5d1 6s2 is a d block element. Reason: The last electron enters the d-orbital.
(A) Both Assertion and Reason are false. (B) Assertion is true, but Reason is false. (C) Both Assertion and Reason... View Article
Which of the following is not an amorphous substance?
(A) Glass (B) Copper (C) Rubber (D) Polymers The Correct Answer is (B) Copper Solution: Copper is not an amorphous... View Article
Using VSEPR theory, draw the shape of PCl5 and BrF5 molecules. Write the state of hybridization of the IRR central atoms.
Solution: The shape of PCl5 molecule. There are five lone pairs of electrons around P. The arrangement of these electrons... View Article
Given below are the standard electrode potentials of a few half-cells. K+/K =-2.93 V, Ag+/Ag = 0.80 V, Mg2+/Mg = – 2.37 V,Cr3+/Cr = – 0.74 V. What will be the correct order of these metals in increasing reducing power?
Given:K+/K =-2.93 V, Ag+/Ag = 0.80 V, Mg2+/Mg = – 2.37 V,Cr3+/Cr = – 0.74 V. (A) K < Mg... View Article
Which among the following is an odd electron molecule?
(A) NO (B) NO2 (C) ClO2 (D) All of these The Correct Answer is (D) All of these. Solution: NO,... View Article
What weights of P4O6 and P4O10 will be produced by the combustion of 31g of P4 in 32g of oxygen leaving no P4O2?
(A) 55 g and 71 g (B) 17.5 g and 19.5 g (C) 2.75 g and 35.5 g (D) 2.75... View Article
The total energy of an electron in the first excited state of the hydrogen atom is -3.4 eV. Find out its (i) kinetic energy and (ii) potential energy in this state.
Solution: (i) Kinetic energy (KE) Kinetic energy of electron is — KE = \(\begin{array}{l} \frac{13.6 Z^{2}}{n^{2}} eV\end{array} \) For the... View Article
Which of the following compounds does not show geometrical isomerism?
(A) 2-butene (B) 2-pentene (C) 2-methyl propene (D) 2-3-dibromo-2-butene The Correct Answer is (C) 2- Methyl Propane Solution: 2−methyl propene... View Article
Identify the correct order of reactivity in electrophilic substitution reactions of the following compounds:
Image (A) I > II > III > IV (B) II > I > III > IV (C) III >... View Article
To carry out a given conversion, Arrange the following reagents in correct order.
(1) H+ (2) O3/Zn (3) NaOCl (4) EtONa / EtOH/ Δ Image (A) 1 → 2 → 3 → 4... View Article
Which of the following compounds is most reactive towards nucleophilic addition reaction?
(A) PhCOPh (B) CH3CHO (C) PhCOCPH3 (D) CH3COCH3 The Correct Answer is (B) CH3CHO Solution: The aromatic aldehydes and ketones... View Article
Which of the following compounds has only a primary hydrogen atom?(A) Butane (B) Isobutane (C) Isopentane (D) Cyclohexane
The Correct Answer is (D) Cyclohexane Solution: The compound having only the primary hydrogen atom is cyclohexane. In Cyclohexane, a... View Article
The correct order of acidity of the following elements is i)Phenol (ii)Methyl phenol (iii)Meta-nitro phenol (iv) Para-nitro phenol
(A) Phenol > Meta-nitrophenol > Methyl phenol > Para-nitrophenol (B) Para-nitrophenol > Meta-nitrophenol > Phenol > Methyl phenol (C) Methyl... View Article
Rare-earth elements are exhibited by_______.
(A) Atomic numbers 21 to 30. (B) Atomic numbers 39 to 71. (C) Atomic numbers 58 to 71. (D) Atomic... View Article
What do you understand about the term non-stoichiometric hydrides? Do you expect this type of the hydrides to be formed by alkali metals? Justify your answer.
Solution: In non-stoichiometric hydrides, the ratio of the metal to hydrogen is fractional and does not correspond to the actual... View Article
The circumference of the second orbit of an atom or ion having single electron is 4 * 10-9 m. The de-Broglie wavelength of electron revolving in this orbit should be
(A) 1 * 10-9 m (B) 2 * 10-9 m (C) 4 * 10-9 m (D) 8 * 10-9 m... View Article
What happens to the half-life period for a first-order reaction, if the initial concentration of the reactants is increased?
(A) Increases (B) Decreases (C) Remains unchanged (D) Increases and then decreases. The Correct Answer is (C) Remains unchanged Solution:... View Article
Assertion: P-Nitro phenol is a stronger acid than O-nitro phenol. Reason: Intramolecular hydrogen bonding makes ortho – isomer weaker acid than para – isomer.
(A) Both Assertion and Reason are false. (B) Assertion is true, but Reason is false. (C) Both Assertion and Reason... View Article
If m times the mth term of an A.P. is equal to n times nth term, then (m+n)th term of the A.P is ____.
If m times the mth term of an A.P. is equal to n times nth term, then (m+n)th term of... View Article
