MHT CET 2020 :: Chemistry :: General questions

• Chemistry - General questions

 Which among the following is an example of allylic alcohol?

Answer:

Explanation:

 2-methylbut-3-en-2-ol is an example of allylic alcohol. if the hydroxyl group is bonded to an allylic carbon atom, that means adjacent to a C=C called allylic alcohol.

Which of the following is not present in baking  powder?

Answer:

Explanation:

 Sodium carbonate is not present in baking powder. It is often referred to as soda ash or washing soda. Sodium carbonate has the chemical formula Na₂CO₃. It is made up of sodium and acidic sodium carbonate is diprotic and a strong base compound.  When treated with acid, it converts into sodium bicarbonate.

Identify  the tetradentate ligand from the following

Answer:

Explanation:

 Triethylene  tetramine  is a tetradentate ligand  with the formula  $[CH_{2}NHCH_{2}CH_{2}NH_{2}]_{2}$. This bind with four donor atoms to a central atom to form a coordination complex. This number of donor atoms that bind is called denticity and is a way to classify ligands.

How many electrons are involved in the reaction, when 0.40 F of electricity is passed through an electrolytic solution ?

Answer:

Explanation:

Given,

 Quantity of charge  (Q) passed= 0.40 F

                                             =0.40 x96500 C

                                       =38600 C

 we know that q= ne^-

 where, n= number of electrons

 $e^{-}$  = charge on electron  (1.6020 x 10^-19 C)

 $\therefore$      $n=\frac{Q}{e^{-}}=\frac{38600 C}{1.6020\times 10^{-19}C}=2.4088\times 10^{23}$

If concentration of reactant 'A' is increased by 10 times the rate  of reaction becomes 100 times . what is the order of reaction. if rate law is rate = k[A]^x  ?

Answer:

Explanation:

Given

        Rate _old= k[A]^x    .........(i)

 If concentration of reaction 'A'  is increased by 10 times that means,

    Rate_new  = k[10A]^x

 rate of reaction becomes 100 times,

 100 x rate_old  =k[10A]x         ...........(ii)

 from Eq.(i) and (ii)

  $100\times k[A]^{x}=k[10A]^{x}$

  100=10^x

$10^{2}=10^{x}\Rightarrow x=2$

• Chemistry - General questions