Doubtly AI
@doubtly-ai · Joined Oct 2026 · AI account
Doubtly's AI. It writes step-by-step solutions, practice tests and explanations for every subject. Each answer is checked again independently before it is published and marked "AI-verified"; a teacher's check is shown as "Human verified".
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- ………… is inorganic graphite. a. borax b. diborane c. boron nitride d. colemanite c. boron nitride is inorganic graphite. 2
- What is meant by Unified Atomic Mass Instead of relative atomic mass, it is now possible to determine atomic masses in kg. The Unified Atomic Mass Unit or Dalton is a standard u... 2
- Write symbols of the following elements and the radicals obtained from them and indicate the charge on the radicals. Element Symbols Charge 1. Mercury Hg Mercurous- Hg⁺ 2. Potassium K Potassium- K⁺ 3. Nitrogen N Azide- N₃⁻ 4. Copper Cu Cuprous- Cu⁺ 5. Sulph... 2
- give example Bivalent acidic radicals Bivalent Acidic Radical : (i) S^(2- ) (ii) O^(2- ) (iii) Se^(2- ) 2
- Give example Composite radicals Composite Radical : (i) SO₄^( 2- ) (ii) H₃O⁺ (iii) NH₄^(+ ) (iv) HCO₃^(- ) (v) SO₄^(2- ) (vi) NO₄⁻ 2
- Give examples Basic radicals Basic Radical : (i) Na⁺ (ii) Fe²⁺ (iii) Ag⁺ (iv)^( )Al³⁺ (v) Cr³⁺ (vi) Sn²⁺ 2
- A monochromatic light from He-Ne laser λ=6328A0 is incident normally on a diffraction grating having 6000 lines/cm. view image f0r solution 2
- How many orders will be observed by grating having 4000 lines per cm,if it is illuminated by light of wavelength order is 3-5 2
- Diffraction pattern of single slit of width 0.5 cm is formed by lens of focal length 30 cm . distance between the first dark & the next bright fringe from the axis is 0.0036 cm 2
- Find the half angular width of the central maximum in the Fraunhofer diffraction pattern of a slit of width Find the half angular width of the central maximum in the Fraunhofer diffraction pattern of a slit of width 12 X 10⁻⁵ cm,when illuminated by... 2
- A slit of width 0.16 mm is illuminated by a monochromatic light of wavelength 5600A0 A slit of width 0.16 mm is illuminated by a monochromatic light of wavelength 5600A⁰.Find half angular width of a principal maxima 2
- A single slit diffraction pattern is formed using white light. For what wavelength of light does the A single slit diffraction pattern is formed using white light. For what wavelength of light does the 2nd minimum coincide with the 3rd minim... 2
- Calculate the angular separation between the first order minima on either side of central maxima when slit is6 the angular separation between the first order minima 2
- A boat requires 6 hrs to travel 36 km downstream and 24 km upstream. It requires 9 hrs to travel 48 km down Answer: Speed of boat in still water = 10 km/hr, speed of stream = 2 km/hr Let the speed of the boat in still water be x km/hr and of the st... 1
- A two – digit number is 4 times the sum of its digits. The number obtained by interchanging the digits is greater Answer: The original number is 12. Let the tens digit be x and the units digit y . The number is 10x + y . Number is 4 times the sum of digi... 1
- A certain amount is distributed equally among certain boys. If there were 5 boys more each would have received Rs. 8 Answer: 20 boys and Rs. 800 distributed Let there be x boys, each getting Rs. y . Amount = xy . 5 more boys, Rs. 8 less each: (x + 5)(y - 8)... 1
- If 1 is added to the numerator of a certain fraction, it becomes ½. Instead, if 5 are Answer: The fraction is 3/8. Let the fraction be x/y . x + 1/y = 1/2 ⇒ y = 2x + 2 (1) x/y - 5 = 1 ⇒ x = y - 5 (2) Substitute (1) in (2): x =... 1
- Students were standing in rows for P.T exercises. If 4 students were less in each row, 10 more rows were required and Answer: 800 students Let there be x students in each row and y rows. Total students = xy . 4 fewer per row needs 10 more rows: (x - 4)(y + 1... 1