MHT CET 2019 :: Chemistry :: General questions

• Chemistry - General questions

 The bacteriostatic antibiotic  from the following is 

Answer:

Explanation:

Among the following antibiotics, tetracycline is a bacteriostatic antibiotic, it inhibits the growth of bacteria in the body by interfering with bacterial protein production DNA replication or other aspects of bacterial cellular metabolism this group includes: Chloramphenicol, sulfonamides spectinomycin etc.

On the other hand, penicillin  , aminoglycosides and ofloxacin are examples of bactericidal antibiotic.

Calculate the difference between heat of combustion of carbon monoxide gas at constant pressure and at constant volume at 27° C ?

 (R=2 cal K^-1 mol^-1)

Answer:

Explanation:

 Given,

 T=27° C=300K

 R= 2 cal K^-1 mol^-1

 Reaction for combustion of carbon monoxide is given as :

$CO(g)+\frac{1}{2}O_{2}(g)\rightarrow CO_{2}(g)$

 $\therefore$      $\triangle n_{g}=1-1.5=-\frac{1}{2}$

 Now, the difference between  heat of combustion of carbon monoxide gas at constant pressure and at constant volume is given by

$\triangle H -\triangle U= \triangle n_{g} RT$

$\therefore$     $\triangle H -\triangle U=-\frac{1}{2}\times 2\times300=-300 cal$

 When CuSO₄ solution in water is treated with concentrated HCl it turns

Answer:

Explanation:

 When CuSO₄  solution in water is treated with conc. HCl, the deep blue solution slowly turns yellow-green due to the formation of copper chloride complex

How many isoprene units are present in abscisic acid ?

Answer:

Explanation:

 Abscisic acid with molecular formula C₁₅ H₂₀ O₄ is composed of three isoprene units. The structure of abscisic acid is shown below:

 Which of the following methods is used to separate wolframite and stannic oxide present in cassiterite?

Answer:

Explanation:

 Magnetic separation is used to separate wolframite and stannic oxide present in cassiterite. This method is based upon the difference in the magnetic properties of the ore components. In this process, either ore or gangue is magnetic in nature.

• Chemistry - General questions