De 8 - K thi th i hc(2 Thi gian lm bi 90 pht S 08 1 Ion X2...

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K× thi thö ®¹i häc(2) ( Thêi gian lµm bµi : 90 phót) Đ S 08 1. Ion X 2+ có c u hình electron là 1s 2 2s 2 2p 6 . Xác đ nh v trí c a X trong b ng HTTH? A. Chu kỳ 2, nhóm VIII A . B. Chu kỳ 3, nhóm II A . C. Chu kỳ 4, nhóm I A . D. Chu kỳ 2, nhóm II A . 2. T hai đ ng v c a cacbon là 12 C, 14 C và 3 đ ng v c a oxi là 16 O, 17 O, 18 O có th t o ra ể ạ đ c bao nhiêu phân t khí cacbonic khác nhau? ượ 3. Trong m t phân nhóm chính c a b ng tu n hoàn, đi t trên xu ng d i thì đi u kh ng ướ đ nh nào sau đây là đúng? A. S đi n tích h t nhân gi m d n. B. Đ âm đi n tăng d n. C. Bán kính nguyên t tăng d n. D. Tính kim lo i gi m d n. 4. Trong phòng thí nghi m HNO 3 đ c đi u ch theo ph n ng sau: ượ ế NaNO 3 (r n) + H 2 SO 4 đ c → HNO 3 + NaHSO 4 Ph n ng trên x y ra là vì A. axit H 2 SO 4 có tính axit m nh h n HNO ơ 3 . B. HNO 3 d bay h i h n. ơ ơ C. H 2 SO 4 có tính oxi hoá m nh h n HNO ơ 3 . D. m t nguyên nhân khác.
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