将下列氢化物按热稳定性从大到小的顺序 排列正确的是( ) A: HF > H2O > NH3 > PH3 > AsH3 B: H2O > HF > NH3 > PH3 > AsH3 C: HF > H2O > AsH3> PH3 >NH3 D: NH3 > HF >H2O > PH3> AsH3
将下列氢化物按热稳定性从大到小的顺序 排列正确的是( ) A: HF > H2O > NH3 > PH3 > AsH3 B: H2O > HF > NH3 > PH3 > AsH3 C: HF > H2O > AsH3> PH3 >NH3 D: NH3 > HF >H2O > PH3> AsH3
下列分子按键角大小排列,其顺序正确的是( )。 A: H2O>NH3>PH3>AsH3 B: AsH3>PH3>NH3>H2O C: NH3>H2O>PH3>AsH3 D: NH3>PH3>H2O>AsH
下列分子按键角大小排列,其顺序正确的是( )。 A: H2O>NH3>PH3>AsH3 B: AsH3>PH3>NH3>H2O C: NH3>H2O>PH3>AsH3 D: NH3>PH3>H2O>AsH
下列各组物质沸点高低顺序中正确的是( ) A: NH<sub>3</sub>>AsH<sub>3</sub>>PH<sub>3</sub> B: H<sub>2</sub>Te>H<sub>2</sub>Se>H<sub>2</sub>S>H<sub>2</sub>O C: CH<sub>4</sub>>GeH<sub>4</sub>>SiH<sub>4</sub> D: HI>HBr>HCl>HF
下列各组物质沸点高低顺序中正确的是( ) A: NH<sub>3</sub>>AsH<sub>3</sub>>PH<sub>3</sub> B: H<sub>2</sub>Te>H<sub>2</sub>Se>H<sub>2</sub>S>H<sub>2</sub>O C: CH<sub>4</sub>>GeH<sub>4</sub>>SiH<sub>4</sub> D: HI>HBr>HCl>HF
偶函数y=f(x)在(-∞,0)上单调递增,则有( ) A: f(-3)>f(π)>f(-3π) B: f(π)>f(-3)>f(-3π) C: f(-3π)>f(-3)>f(π) D: f(-3)>f(-3π)>f(π)
偶函数y=f(x)在(-∞,0)上单调递增,则有( ) A: f(-3)>f(π)>f(-3π) B: f(π)>f(-3)>f(-3π) C: f(-3π)>f(-3)>f(π) D: f(-3)>f(-3π)>f(π)
下列碳正离子的稳定性顺序是:( ) A: (1) > (2) > (3) > (4) B: (2) > (4) > (3) > (1) C: (1) > (3) > (2) > (4) D: (2) > (4) > (1) > (3)
下列碳正离子的稳定性顺序是:( ) A: (1) > (2) > (3) > (4) B: (2) > (4) > (3) > (1) C: (1) > (3) > (2) > (4) D: (2) > (4) > (1) > (3)
Most of the houses in the village were burnt to _____ during the war. A: an ash B: the ash C: ash D: ashes
Most of the houses in the village were burnt to _____ during the war. A: an ash B: the ash C: ash D: ashes
下面化合物的熔点高低次序是:( ) A: (1)>(3)>(2) B: (3)>(2)>(1) C: (1)>(2)>(3) D: (3)>(1)>(2)
下面化合物的熔点高低次序是:( ) A: (1)>(3)>(2) B: (3)>(2)>(1) C: (1)>(2)>(3) D: (3)>(1)>(2)
将下列化合物按极性大小排列顺序:(1)CH4 (2)CH3F (3)CH3Cl (4 )CH3Br (5)CH3I A: (1)>(2)>(3)>(4)>(5) B: (5)>(4)>(3)>(2)>(1) C: (2)>(3)>(4)>(5)>(1) D: (3)>(4)>(5)>(1)>(2)
将下列化合物按极性大小排列顺序:(1)CH4 (2)CH3F (3)CH3Cl (4 )CH3Br (5)CH3I A: (1)>(2)>(3)>(4)>(5) B: (5)>(4)>(3)>(2)>(1) C: (2)>(3)>(4)>(5)>(1) D: (3)>(4)>(5)>(1)>(2)
比较下列化合物的碱性强弱(1)脲(2)乙酰胺(3)乙胺(4)丙二酰脲 A: (1)>(2)>(3)>(4) B: (2)>(4)>(3)>(1) C: (3)>(1)>(2)>(4) D: (4)>(2)>(3)>(1)
比较下列化合物的碱性强弱(1)脲(2)乙酰胺(3)乙胺(4)丙二酰脲 A: (1)>(2)>(3)>(4) B: (2)>(4)>(3)>(1) C: (3)>(1)>(2)>(4) D: (4)>(2)>(3)>(1)
下列物质(1) CaO;(2) MgO;(3) NH3;(4) PH3熔点由高到低的顺序为:( ) A: (1) > (2) > (3) > (4) B: (1) > (2 ) > (4 ) > (3) C: (2) > (1) > (4) > (3) D: (2 ) > (1) > (3 ) > (4 )
下列物质(1) CaO;(2) MgO;(3) NH3;(4) PH3熔点由高到低的顺序为:( ) A: (1) > (2) > (3) > (4) B: (1) > (2 ) > (4 ) > (3) C: (2) > (1) > (4) > (3) D: (2 ) > (1) > (3 ) > (4 )