This chemistry question involves key chemical concepts and calculations. The detailed solution below walks through each step, from identifying the reaction type to computing the final answer.
ScanSolve AI Answer
SECTION - A i) 1 pm = 10^-12 m. The prefix "pico" (p) denotes 10^-12. The correct option is b) 10^-12. ii) The number of significant figures in 1.50 × 10^4 g is 3. In scientific notation, all digits in the coefficient (1.50) are significant. The trailing zero after the decimal point is significant. The correct option is a) 3. iii) A mixture of Acetone and Benzene can be separated by fractional distillation. Acetone and Benzene are miscible liquids with different boiling points (Acetone: 56 °C, Benzene: 80 °C), making fractional distillation an effective separation method. The correct option is b) Fractional Distillation. iv) The SI unit of Frequency is Hertz (Hz). The Hertz is defined as one cycle per second (s^-1). The correct option is c) Hz. v) The type of hybridization in BF_3 is sp^2. Boron in BF_3 forms three single bonds with fluorine atoms and has no lone pairs. This results in a trigonal planar geometry and sp^2 hybridization. Based on the provided options, assuming 'a)' is intended to be sp^2 despite the blurriness, the correct option is a) sp^2. (Note: If option 'a)' is strictly sp^3, then sp^2 is not listed, and the question options are flawed.) vi) The oxidation number of S in SO_4^2- is +6. Let the oxidation number of S be x. The oxidation number of oxygen is typically -2. The overall charge of the ion is -2. x + 4(-2) = -2 x - 8 = -2 x = +6 The correct option is c) +6. vii) Which of the following pairs is not isoelectronic? Isoelectronic species have the same number of electrons. a) Na^+ (10 electrons) & Na (11 electrons) - Not isoelectronic. b) Mg^2+ (10 electrons) & Ne (10 electrons) - Isoelectronic. c) Al^3+ (10 electrons) & B^3+ (2 electrons) - Not isoelectronic. d) P^3- (18 electrons) & N^3- (10 electrons) - Not isoelectronic. Since the question asks for a pair that is not isoelectronic, and options a, c, and d all fit this description, the question is ambiguous. However, if only one answer must be chosen, we select the first instance. The correct option is a) Na^+ & Na. viii) The composition of syngas is primarily carbon monoxide (CO) and hydrogen (H_2). Syngas, or synthesis gas, is a fuel gas mixture consisting primarily of hydrogen, carbon monoxide, and often some carbon dioxide. The correct option is a) CO + 3H_2. ix) Borax has formula Na_2B_4O_7. Borax is commonly known as sodium tetraborate decahydrate (Na_2B_4O_7 · 10H_2O), but its anhydrous form is Na_2B_4O_7. Options b) and d) are identical. The correct option is **b) $Na_2B_4O_