Z= 8, Z =25 এর ইলেকট্রন বিন্যাস হবে-

Created: 4 months ago | Updated: 2 months ago

1 s^{2} 2 s^{2} 2 p^{2} 3 s^{1} (A r) 3 d^{5} 4 s^{1} 4 p^{1}

1 s^{2} 2 s^{2} 2 p^{3} 3 s^{2}, (A r) 3 d^{2} 4 s^{2} 4 p^{3}

1 s^{2} 2 s^{2} 2 p^{4} 3 s^{0}, (A r) 3 d^{5} 4 s^{2} 4 p^{0}

1 s^{2} 2 s^{1} 2 p^{4} 3 s^{1}, (A r) 3 d^{4} 3 s^{4} 4 p^{2}

306

কোনটি প্রাইমারি স্ট্যান্ডার্ড পদার্থ নয়? (Which is not a primary standard substance?)

Created: 4 months ago | Updated: 2 months ago

K M n O_{4}

H_{2} C_{2} O_{4}

K_{2} C r_{2} O_{7}

N a_{2} C O_{3}

231

Created: 4 months ago | Updated: 2 months ago

J . K^{- 1} K g^{- 1}

J . K^{- 1} m^{- 1}

J . K^{- 1} m o l^{- 1}

J . K^{- 1}

182

Created: 4 months ago | Updated: 2 months ago

B a C l_{2} (a q) + H_{2} S O_{4} (a q) \to B a S O_{4} (s) + H C l (a q)

B a^{2 +} (a q) + S O_{4} (a q) \to B a S O_{4} (s)

B a^{2 +} (a q) + 2 S O_{4} (a q) \to B a (S O_{4})_{2} (s)

B a^{2 +} (a q) + S {O_{4}}^{2 -} (a q) \to B a S o 4 (s)

Admission ঢাকা বিশ্ববিদ্যালয় ক ইউনিট ২০১৪-২০১৫ রসায়ন

709

Created: 4 months ago | Updated: 2 months ago

C a C l_{2}

M g S O_{4}

M g C O_{3}

C a S O_{4}

220

Created: 4 months ago | Updated: 2 months ago

4-10% HCOOH

4 - 10 % C H_{3} C O O H

40% HCOOH

40% HCHO

189