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If A = {8, 9, 10} and B = {1, 2, 3, 4, 5}, then the number of elements in A × A × B are

(a) 15 (b) 30 (c) 45 (d) 75 Solution: Given A = {8, 9, 10} B = {1, 2, 3, 4, 5} n(A) = 3 n(B) = 5 Number of... View Article

Which of the following is most soluble in water?

(A) AgI (B) AgF (C) AgCl (D) AgBr The Correct Answer is (B) AgF Solution: Among the given silver halides, Silver fluoride [AgF] is... View Article

Assertion: Phenolphthalein is an acid-base indicator. Reason: In an acid-base titration, this indicator is used.

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

Phenol with CCl4 and KOH gives salicylic acid. This reaction is known as_______.

(A) Siemlet reaction. (B) Rosenmund's reaction. (C) Friedel-Craft reaction. (D) Reimer - Tiemann reaction. The Correct Answer is (D)... View Article

Which of the following transitions in hydrogen atoms emit photons of highest frequency?

(A) n=1 to n=2 (B) n=2 to n=1 (C) n=2 to n=6 (D) n=6 to n=2 The Correct Answer is (B) n=2 to n=1 The n=2 to n=1 transitions in... View Article

Which one of the following compounds most readily undergoes substitution by SN2 mechanism?

The Correct Answer is (B) Solution: The increasing order of the nucleophilic substitution by SN2 mechanism is: alkyl halide < sec alkyl... View Article

Which of the following elements produce H2 gas with sodium hydroxide?

(A) Zn (B) Al and Pb (C) Si and Sn (D) All of these. The Correct Answer is (D) All of These. Solution: In the above-given elements,... View Article

Given: (1) Cu2+ + 2e- → Cu, E° = 0.337 V(2) Cu2+ + e- → Cu+, E° = 0.153 V. What will be the Electrode potential E for the reaction: Cu+ + e- → Cu

(A) 0.30 V (B) 0.38 V (C) 0.52 V (D) 0.90 V The Correct Answer is (C) 0.52 V Solution: For the given reactions: (1) (2)... View Article

Which of the following statements is true about the Tyndall effect?

(A) It is observed only when the size of the particles is generally between 10−11 and 10−9 m in diameter. (B) It is observed only... View Article

What is the oxidation state of C in the product obtained during the following reaction?

(A) 0 to 2 (B) 0 to +2 (C) 0 to -2 (D) +2 to -2 The Correct Answer is (B) 0 to +2. Solution: In the above-given reaction, Here: O... View Article

Which of the following will have a metal deficiency defect?

(A) FeO (B) ZnO (C) KCl (D) NaCl The Correct Answer is (A) FeO. Solution: In metal deficiency defects, a cation is missing from... View Article

Which of the following has the maximum percentage of carbon in it?

(A) Pig iron (B) Cast iron (C) Hard steel (D) Wrought iron The Correct Answer is (B) Cast iron. Solution: Cast iron has the maximum... View Article

Which set of quantum numbers is possible for the last electron of Mg+ ion?

(A) n = 1, l = 0, m = 0, s = +1/2 (B) n = 2, l = 3, m = 0, s = +1/2 (C) n = 3, l = 0, m = 0, s = +1/2 (D) n = 3, l = 2, m = 0, s = +1/2... View Article

Balance the following chemical equation by oxidation number method.

Solution: The balanced chemical equation by oxidation number method is: Explore more such questions and answers at BYJU'S.... View Article

Among the molecules SO2, SF4, ClF3,BrF5 and XeF4. Which of the following shapes does not describe any of these molecules?

(A) V shape (B) Bent shape (C) square pyramidal (D) Trigonal bipyramidal The Correct Answer is (B) Bent shape Solution: Water, ozone... View Article

Which of the following orbital overlapping will form Pi bond?

The Correct Answer is (C) Solution: Lateral overlapping of orbitals will form pi bonds. s orbital will always overlap axially with any other... View Article

Assertion:Decomposition of vegetable matter into compost is an endothermic reaction. Reason: Decomposition reaction involves breakdown of a single reactant into simpler products.

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

The molecular weight of oxide of an element is 44. The equivalent weight of the element is 14. The atomic weight of the element is____.

(A) 7 (B) 14 (C) 28 (D) 56 The Correct Answer is (B) 14 Solution: Let the molecular formula of an oxide be M2Ox The given... View Article

Which of the following compounds reacts with NaNO2 and HCl at -4°C to yield alcohol (OR) phenol?

(A) C2H5NH2 (B) C6H5NH2 (C) CH3NHCH3 (D) C6H5NHCH3 The Correct Answer is (A) C2H5NH2 Solution: C2H5NH2 is an aliphatic primary amine, which... View Article

In the titration of CH3COOH against NaOH, which of the following indicator acts as a suitable indicator for this titration?

(A) Methyl red (B) Methyl orange (C) Phenolphthalein (D) Bromothymol blue The Correct Answer is (C) Phenolphthalein Solution: In the... View Article

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