Among the following groupings which represents the collection of isoelectronic species: A) CO,`NO^(+)`, `CN^(-1)`,`C_(2)^(-2)` B) `N_(2)`,`C_(2)^(-2)`,CO,NO C) NO,`CN^(-1)`,`N_(2)`, `O_(2)^(-1)` D) `NO^(+1)`,`CN_(2)^(-2)`,`O_(2)^(-1)`, CO

The number of paramagentic species among the following is O_(2), CO, N_(2), C_(2), CsO_(2), BaO_(2), CO_(2)

Among the following oxides how many of them are suboxides ? (a) C_(3)O_(2) , (b) N_(2)O , (c ) NO_(2) , (d) CO (e) Fe_(3)O_(4) , (f) KO_(2)

If sinx+cos e cx=2, then sin^n x+cos e c^n x is equal to 2 (b) 2^n (c) 2^(n-1) (d) 2^(n-2)

How many of these molecules are diamagnetic and have bond order more than 2 O_(2)^(2+), CO, overset(-)CN, NO, NO^(+), N_(2), O_(2)^(+), N_(2)^(2-), O_(2)^(2-)

For the following reaction in gaseous phase, CO + (1)/(2) O_2 to CO_2 ,(K_c)/( K_p) is

Among the following optical activity is possible in (a) [Co(H_(2)O)_(2)(NH_(3))_(3)CI]^(o+) (b) [Co(H_(2)O))_(4)CI_(2)]^(o+)] (c ) [Co(NH_(3))_(4)(NO_(2))CI]^(o+) (d) [Co(CN)_(5)NC]^(Θ) .

Which would exhibit ionisation isomerism (a) [Co(NH_(3))_(6)][(C_(2)O_(4))_(3)] (b) [Co(NH_(3))_(5)Br]^(2+)SO_(4)^(2-) (c ) K_(3)[Fe(CN)_(6)] (d) K_(3)[Fe(C_(2)O_(4))_(3)] .

How many of the following species have bond order of 2.5 ? N_(2)^(o+) (ii) N_(2)^(Theta) (iii) O_(2)^(o+) (iv) O_(2)^(Theta) (v) NO (vi) CN .

The general formula C_n H_(2n+2) represents_____.

If n is a positive integer then ^nC_r+^nC_(r+1)=^(n+1)^C_(r+1) Also coefficient of x^r in the expansion of (1+x)^n=^nC_r. In an identity in x, coefficient of similar powers of x on the two sides re equal. On the basis of above information answer the following question: If n is a positive integer then ^nC_n+^(n+1)C_n+^(n+2)C_n+.....+^(n+k)C_n= (A) ^(n+k+1)C_(n+2) (B) ^(n+k+1)C_(n+1) (C) ^(n+k+1)C_k (D) ^(n+k+1)C_(n-2)