• A. $Mg{\left(OH\right)}_2$

Answer: Option A

Explanation:

• A. $PH\downarrow PC{O}_2\downarrow$
• B. $PH\uparrow PC{O}_2\uparrow$
• C. $PC{O}_2\uparrow PH\downarrow$
• D. $PHC{O}_3\uparrow PH\downarrow$

Answer: Option C

Explanation:

• A. $H_{2}O$
• B. $C{O}_2$
• C. $N{H}_3$
• D. $P{H}_3$

Answer: Option B

Explanation:

• A. $NaCI$
• B. $AgN{O}_3$
• C. $ZnS{O}_4$
• D. $AlC{l}_3$

Answer: Option B

Explanation:

• A. $C{H}_4$
• B. $C{H}_{3}Cl$
• C. NaCl
• D. $PC{l}_3$

Answer: Option C

Explanation:

• A. 6 – 10% HCOOH
• B. $6–10\%C{H}_{3}COOH$
• C. $6–10\%C_2{H}_{5}COOH$
• D. $6–10\%C_6{H}_{5}COOH$

Answer: Option B

Explanation:

• A. Fe
• B. $C{l}_2$
• C. $B{r}_2$
• D. $I_2$

Answer: Option C

Explanation:

• A. $Cao$
• B. $Ca{\left(OH\right)}_2$
• C. $C{H}_3{\left(COO\right)}_{2}Ca$
• D. $Ca{u}_2$

Answer: Option A

Explanation:

• A. $40kgm{s}^{-1}$
• B. $100kgm{s}^{-1}$
• C. $4kgm{s}^{-1}$
• D. $400kgm{s}^{-1}$

Answer: Option D

Explanation:

• A. $f=\frac{pv}{2}$
• B. $f=\frac{p}{2}\times m$
• C. $f=\frac{PN}{120}$
• D. $f=\frac{120}{PN}$

Answer: Option C

Explanation:

• A. $১{০}^{৬}$
• B. $১{০}^{৮}$
• C. $১{০}^{৫}$
• D. $১{০}^{৯}$

Answer: Option A

Explanation:

• A. $\frac{১}{৫}$
• B. $\frac{১}{৬}$
• C. $\frac{১}{৪}$
• D. $\frac{১}{৩}$

Answer: Option A

Explanation:

• A. $f=0.5$ PV
• B. $f=P 0.5 N$
• C. $f=\frac{PV}{120}$
• D. $f=120\times PI$

Answer: Option C

Explanation:

• A. 1m
• B. $\frac{1}{2}m$m
• C. $\frac{1}{12}m$m
• D. 18m

Answer: Option C

Explanation:

• A. $C{H}_4$
• B. $C_2{H}_4$
• C. $C_2{H}_2$
• D. $C_6{H}_6$

Answer: Option A

Explanation: