7 x 11 x 13 x 15 15 is a Prime number. Is this True or False?
Given, 7×11×13×15+15 We can take, 15 common from the above expression; 15 ( 7×11×13+1) = 15 (1002) Now, the above expression... View Article
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Find the smallest number which when divided by 15 and 27, respectively, leaves a remainder 7, in each case.
The smallest number which when divided by 15 and 27, respectively, leaves a remainder 7, is 142. Explanation: Given, the... View Article
The least number which is a perfect square and is divisible by each of 16, 20 and 24 is:
The least number which is a perfect square and is divisible by each of 16, 20 and 24 is 3600.... View Article
The number of angular nodes for 4d orbital is:
(A) 1 (B) 2 (C) 3 (D) 4 The Correct Answer is (B) 2 Solution: The number of angular nodes... View Article
When a lead storage battery is discharged, then:
(A) Pb is formed (B) SO2 is evolved (C) H2SO4 is consumed (D) PbSO4 is consumed The Correct Answer is... View Article
What is the oxidation number of manganese (Mn) in potassium permanganate(KMnO4)?
(A) +5 (B) +7 (C) +8 (D) +9 The Correct Answer is (B) +7 Solution: The oxidation number of Potassium(K)... View Article
Osmotic pressure of a solution is
(A) Equal to the pure solvent. (B) Lesser than the pure solvent. (C) Greater than the pure solvent. (D) Both... View Article
Extraction of zinc from zinc blende is achieved by:
(A) Electrolytic reduction (B) Roasting followed by self reduction (C) Roasting followed by reduction with carbon (D) Roasting followed by... View Article
Temporary hardness of water is due to the presence of:
(A) Sodium Chloride (B) Calcium hydrogen carbonate (C) Magnesium hydrogen carbonate (D) Both (B) and (C) The Correct Answer is... View Article
The compressibility factor for an ideal gas is
(A) 0 (B) 1 (C) 2 (D) 4 The Correct Answer is (B) 1 Solution: The compressibility factor for an... View Article
Calculate the percentage of nitrogen present in urea?
(A) 16.3 (B) 38.4 (C) 46.6 (D) 59.1 The Correct Answer is (C) 46.6 Solution: Molecular weight of urea(NH2CONH2)is 60.06... View Article
How many moles of electron weigh one kilogram?
(A) 6.023 * 10 23 moles (B) 1 / 9.108 * 6.023 * 108 moles (C) 6.023 / 9.108 * 1054 moles (D)... View Article
How many moles of magnesium phosphate will contain 0.25 mole of oxygen atoms ?
(A) 0.02 (B) 2.5 * 10-2 (C) 1.25 * 10-2 (D) 3.125 * 10-2 The Correct Answer is (D) 3.125... View Article
If NaCl is doped with 10−3 mol % of SrCl2. What is the concentration of cation vacancies?
Solution: Given Conetration of SrCl2 = 10−3 mol% Concentration is in percentage, so that takes a total 100 mol of... View Article
The lanthanide contraction is responsible for the fact that__________.
(A) Zn and Y have about the same radii (B) Zr and Hf have about the same radii (C) Zr... View Article
Iodoform test is not given by:
(A) CH3CHO (B) C2H5OH (C) Pentan-3-one (D) Pentan-2-one The Correct Answer is (C) Pentane-3-one Solution: Iodoform test is given by... View Article
In which of the following most efficient packing in present?
(A) hcp (B) bcc (C) Simple cubic (D) None Of These The Correct Answer is (A) hcp Solution: The packing... View Article
Which of the following molecules is paramagnetic?
(A) O3 (B) N2 (C) CO (D) NO The Correct Answer is (D) NO Solution: Nitric oxide (NO) is paramagnetic... View Article
What is the percentage of nitrogen present in ammonium nitrate? (N=14, H=1, O=16)
(A) 25 % (B) 30 % (C) 35 % (D) 40 % The Correct Answer is (C) 35 %. Solution:... View Article
The outer orbitals of C in ethene molecule can be considered to be hybridized to give three equivalent SP2 orbitals.The total number of sigma(σ) and Pi(π) bonds in ethene molecule is
(A) 1 sigma(σ) and 2 Pi(π) bonds (B) 2 sigma(σ) and 1 Pi(π) bonds (C) 3 sigma(σ) and 2 Pi(π)... View Article
