• A. ${\mathrm{CH}}_4$
• B. ${\mathrm{NH}}_3$
• C. ${\mathrm{H}}_2\mathrm{O}$
• D. ${\mathrm{CO}}_2$

Answer: Option D

Explanation:

• A. $C{H}_{3}CH=C{H}_2$
• B. $C_6{H}_{5}OH$
• C. $C_6{H}_{5}N{H}_2$
• D. $C_6{H}_{5}C{H}_3$

Answer: Option D

Explanation:

• A. $C{H}_{3}COC{H}_3$
• B. $C{H}_{3}C{H}_{2}C{H}_{2}OH$
• C. $C{H}_{3}CH=C{H}_2$
• D. $C{H}_{3}C{H}_{2}COOH$

Answer: Option A

Explanation:

• A. $N_2$
• B. $O_2$
• C. $N{H}_3$
• D. $Ar$

Answer: Option C

Explanation:

• A. $d_{x^2-y^2}, d_{z^2}$
• B. $d_{xy}, d_{z^2}$
• C. $d_{yz}, d_{x^2-y^2}$
• D. $d_{xy}, d_{xz}$

Answer: Option A

Explanation:

• A. ${\mathrm{Br}}_2\mathrm{C}={\mathrm{CBr}}_2$
• B. ${\mathrm{COCI}}_2$
• C. $HCHO$
• D. ${\mathrm{BF}}_3$

Answer: Option C

Explanation:

• A. ${\mathrm{CH}}_3^{+}$
• B. ${\mathrm{CH}}_3^{-}$
• C. ${\mathrm{NH}}_2^{-}$
• D. ${\mathrm{NH}}_4^{+}$

Answer: Option B

Explanation:

• A. $\mathrm{CH}\equiv \mathrm{CH}$
• B. ${\mathrm{CH}}_2={\mathrm{CH}}_2$
• C. ${\mathrm{C}}_6{\mathrm{H}}_6$
• D. ${\mathrm{CH}}_4$

Answer: Option A

Explanation:

• A. $\left[Ar\right]3d^{5}4s^1$
• B. $\left[Ar\right]4s^{2}3d^4$
• C. $\left[Kr\right]4d^{5}5s^1$
• D. $\left[Kr\right]4d^{4}5s^2$

Answer: Option A

Explanation:

• A. $s{p}^3$
• B. $s{p}^2$
• C. $sp$
• D. $s{p}^{3}d$

Answer: Option B

Explanation:

• A. $2Na+C{l}_2\to 2NaCl$
• B. $AgN{O}_3+NaCl\to NaN{O}_3+AgCl$
• C. $C{l}_2+H_{2}O\to HCl+HOCl$
• D. $FeC{l}_3+SnC{l}_2\to SnC{l}_4+FeC{l}_2$

Answer: Option C

Explanation:

• A. $C{O}_2$
• B. $H_{2}S$
• C. $C_2{H}_2$
• D. $O_2$

Answer: Option B

Explanation:

• A. $HCOOH+HCOONa$
• B. $NaOH+NaCl$
• C. $Aq.N{H}_3+NaOH$
• D. $Aq.N{H}_3+N{H}_{4}Cl$

Answer: Option D

Explanation:

• A. $K_w=1\times {10}^{-14}$
• B. $P{K}_w=14$
• C. $\left[H_3{O}^4\right]\left[OH\right]=K_w$
• D. $K_w=1\times {10}^{-14}M$

Answer: Option D

Explanation:

• A. $B_{e}C{l}_2$
• B. $PC{l}_5$
• C. $BC{l}_3$
• D. $C{l}_2$

Answer: Option B

Explanation: