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Prime factorization of 3136

Solution: We divide 3136 by the smallest prime factor. We keep dividing until it gives a non-zero remainder. 3136/2 = 1568 1568/2 = 784... View Article

What is the formula for sin³x?

Solution: sin3x = (3 sin x - sin 3 x)/4 We know sin 3x = 3 sin x - 4 sin3x Transposing the terms 4 sin3x = 3 sin x - sin 3x Dividing... View Article

Choose the number that is 1/4 of 1/2 of 1/5 of 200.

(a) 4 (b) 5 (c) 20 (d) 40 Solution: 1/5 of 200 = (1/5)×200 = 40 (1/2) of 1/5 of 200 = (½)×40 = 20... View Article

Which of the following are macromolecular colloids?

(A) Soap (B) Starch (C) Cellulose (D) Both (B) and (C) The Correct Answer is (D) Both (B) and (C) Solution: The macromolecular colloids are... View Article

The carbonate of metal is isomorphous with MgCO3 and contains 6.091% of carbon. The atomic weight of the metal is :

(A) 48 (B) 68 (C) 120 (D) 137 The Correct Answer is (D) 137 Explore more such questions and answers at BYJU'S.... View Article

Which of the following mentioned property is more for nitrogen as compared to oxygen

(A) Electron affinity (B) Ionisation energy (C) Both (A) and (B) (D) None Of These The Correct Answer is (B) Ionisation energy... View Article

Which of the given set of compounds have a higher boiling point?

(A) 1-chloropropane (B) 1-chlorobutane (C) Isopropyl chloride (D) None Of These The Correct Answer is (B) 1-chlorobutane Solution:... View Article

HCF of 16 and 24 is

(A) 4 (B) 6 (C) 8 (D) 10 The Correct Answer is (C) 8 Solution: HCF of 16 The factors of 16 are 1, 2, 4, 8, 16 HCF of 24 The... View Article

A solid XY has a bcc structure. If the distance of closest approach between the two atoms is 173 pm, the edge length of the cell is :

(A) (B) 142.2 pm (C) 200 pm (D) The Correct Answer is (C) 200 pm Solution: Distance of closest approach = for BCC Here a refers to the... View Article

On heating, 4.90 g of Potassium chlorate(KClO3) shows a weight loss of 0.384g. What will be the percentage of the original decomposed Potassium chlorate(KClO3)?

(A) 10 % (B) 15 % (C) 20 % (D) 30 % The Correct Answer is (C) 20 % Solution: The reactions will be: 2 mol of KClO3 produce 3 mol O2... View Article

The spin only magnetic moment of Mn4+ is:

(A) 3 BM (B) 4 BM (C) 5 BM (D) 6 BM The Correct Answer is (B) 4 BM Solution: Mn4 = [Ar]3d3 Where, n = 3 Therefore, the spin only... View Article

In which of the following conjugated double bond is present?

(A) 1,2−Butadiene (B) 1,3−Butadiene (C) 1,3−Pentadience (D) Both (B) and (C) The Correct Answer is (D) Both (B) and (C) Solution:... View Article

Assertion: KCN reacts with methyl chloride to give methyl isocyanide.Reason: CN-$$ is an ambident nucleophile.

(A) Assertion is true, but Reason is false. (B) Assertion is false, but Reason is the correct statement. (C) Both Assertion and Reason are... View Article

BrO3- ion reacts with Br- to form Br2 in an acid medium. The equivalent mass of Br2 in this reaction is:

(A) (B) (C) (D) The Correct Answer is (A) Solution: n-factor = E.w. = Explore more such questions and answers at... View Article

Among KO2, AlO-2 BaO2 and NO+2 unpaired electron are present in:

(A) KO2 (B) BaO2 (C) NO+2 and BaO2 (D) KO2 and AlO-2 The Correct Answer is (A) KO2 Solution: KO2 contain one unpaired electron and it is... View Article

Which of the following can be the nth term of an AP?

(A) n3 + 1 (B) 4n + 3 (C) 3n2 + 5 (D) None OfThese The Correct Answer is (B) 4n + 3 Solution: 4n + 3 can be the nth term of an AP because... View Article

Which of the following is a wrong statement?

(A) Fast reactors use a moderator (B) Fast neutrons have energies above 1000eV (C) Slow or thermal neutrons have an energy of the order... View Article

An element having a bcc structure has 12.08 * 1023 unit cells. The number of atoms in these cells is:

(A) 12.08 * 1022 (B) 12.08 * 1023 (C) 24.16 * 1023 (D) 48.38 * 1023 The Correct Answer is (C) 24.16 * 1023 Solution: The Zeff of BCC... View Article

If the conductivity of 0.02 M solution of KCL at 298 K is 0.0248S cm-1.Calculate its molar conductivity.

(A) 112 Scm2mol-1 (B) 124 S cm2mol-1 (C) 136 S cm2mol-1 (D) 148 S cm2mol-1 The Correct Answer is (B) 124 S cm2mol-1 Solution: k... View Article

When acidified K2Cr2O7 solution is added to Sn2+ salt, then Sn2+ changes to:

(A) Sn (B) Sn+ (C) Sn3+ (D) Sn4+ The Correct Answer is (D) Sn4+ Solution: K2Cr2O7 is an oxidizing agent, which converts Sn2+ into its... View Article