Browse by Stream
QnA
Home
QnA
Go To Your Study Dashboard

Get Answers to all your Questions

header-bg qa
Filter By
Clear Filter

All Questions

The refining method used when the metal and the impurities have low and high melting temperatures, respectively is:
Option: 1 vapour phase refining
Option: 2 distillation
Option: 3 liquation
Option: 4 zone refining
 

As we have learnt,

 

Liquation -

In this method, a low melting metal like a tin can be made to flow on a sloping surface. In this way, it is separated from higher melting impurities.

-

Liquation, a technique for separating constituents of ore, a metal or an alloy by partial melting. When the material is heated to a temperature where one of the constituents melts and the other remains solid, the liquid constituent can be drained off. 

 

Therefore, Option(3) is correct.

View Full Answer(1)
Posted by

Ritika Jonwal

If a person is suffering from the deficiency if nor-adrenaline, what kind of drug can be suggested ?  
Option: 1 Anti-inflammatory
Option: 2 Antidepressant
Option: 3 Antihistamine
Option: 4 Analgesic

Non-adrenaline is a neurotransmitter. If nor-adrenaline is low, a person may suffer from depression. Hence, an antidepressant drug is suggested.

Anti-depressant → drug, which enhances the mood.

Therefore, the correct option is (2).

View Full Answer(1)
Posted by

Kuldeep Maurya

Crack CUET with india's "Best Teachers"

  • HD Video Lectures
  • Unlimited Mock Tests
  • Faculty Support
cuet_ads

The following molecules act as an :
Option: 1 Antidepranant
Option: 2 Anti-bacterial  
Option: 3 Antiseptic
Option: 4 Anti-histamine

Brompheniramine works by blocking the action of histamine, which causes allergic symptoms.

Hence, it acts as an antihistamine.

Therefore, Option(3) is correct.

View Full Answer(1)
Posted by

Kuldeep Maurya

The mechanism of action of "Terfenadine'' (Seldane) is:
Option: 1 Activates the histamine receptor
Option: 2 Inhibits the secretion of histamine
Option: 3 helps in the secretion of histamine
Option: 4 inhibits the action of histamine receptor

Seldane is an antihistamine drug.

The mechanism of action of “Terfenadine” (Seldane) is to inhibit the action of histamine receptor.

Therefore, the correct option is (4).

View Full Answer(1)
Posted by

Kuldeep Maurya

JEE Main high-scoring chapters and topics

Study 40% syllabus and score up to 100% marks in JEE

Which one of the following compounds possesses the most acidic hydrogen ?
Option: 1
Option: 2
Option: 3
Option: 4

Among these, Option 2 has the most acidic H, Due to the presence of the 3 (COOR) group. More resonating structure more stability of negative charge.

Therefore, Option(2) is correct.

View Full Answer(1)
Posted by

Kuldeep Maurya

The antifertility drug "Novestrol" can react with
Option: 1 \mathrm{ZnCl _{2} / HCl ; FeCl _{3} \text { Alocholic } HCN}
Option: 2 \mathrm{Br _{2} / \text { water; } ZnCl _{2} / HCl ; FeCl _{3}}
Option: 3 \mathrm{\text { Alcoholic } HCN ; NaOCl ; ZnCl _{2} / HCl}
Option: 4 \mathrm{Br _{2} / \text { water } ; ZnCl _{2} / HCl ; NaOCl}

Alkyne group will react with \mathrm{Br _{2} \text { water }}

Tertiary alcohol will react with \mathrm{ZnCl _{2} / HCl}

Phenolic group will react with \mathrm{FeCl _{3}}

Therefore, Option(2) is correct.

View Full Answer(1)
Posted by

Kuldeep Maurya

NEET 2024 Most scoring concepts

    Just Study 32% of the NEET syllabus and Score up to 100% marks

Match the following drugs with their therapeutic actions : (i) Ranitidine                                      (a) Antidepressant (ii) Nardil(Phenelzine)                        (b) Antibiotic (iii) Chloramphenicol                         (c) Antihistamine (iv) Dimethane(Brompheniramine)   (d) Antacid                                                                   (e) Analgesic
Option: 1 (i)-(a); (ii)-(c); (iii)-(b); (iv)-(e)
Option: 2 (i)-(d); (ii)-(a); (iii)-(b); (iv)-(c)
Option: 3 (i)-(e); (ii)-(a); (iii)-(c); (iv)-(d)
Option: 4 (i)-(d); (ii)-(c); (iii)-(a); (iv)-(e)

Drugs with their therapeutic actions :

Ranitidine \rightarrow Antacid
Nardil (Phenelzine)\rightarrow Antidepressant
Chloramphenicol \rightarrow Antibiotic
Dimethane (Brompheniramine) \rightarrow Antihistamine

Therefore, Option 2 is correct.

View Full Answer(1)
Posted by

Kuldeep Maurya

Match List - I with List - II
List - I List - II
(Class of Drug) (Example)
(a) Antacid (i) Novestrol
(b) Artificial Sweetener (ii) Cimetidine
(c) Antifertility (iii) Valium
(d) Tranquilizers (iv) Alitame
Choose the most appropriate match :
 
Option: 1 (a) - (ii), (b) - (iv), (c) - (iii), (d) - (i)
Option: 2 (a) - (iv), (b) - (i), (c) - (ii), (d) - (iii)
Option: 3 (a) - (ii), (b) - (iv), (c) - (i), (d) - (iii)  
Option: 4 (a) - (iv), (b) - (iii), (c) - (i), (d) - (ii)

We know these facts about drugs.

(a) Antacid: Cimetidine
(b) Artificial Sweetener : Alitame
(c) Antifertility : Novestrol
(d) Tranquilizers: Valium

So, the correct match:  (a)-(ii), (b)-(iv), (c)-(i), (d)-(iii)

Therefore, the Correct option is (3)

View Full Answer(1)
Posted by

Kuldeep Maurya

Crack CUET with india's "Best Teachers"

  • HD Video Lectures
  • Unlimited Mock Tests
  • Faculty Support
cuet_ads

The chemical that is added to reduce the melting point of the reaction mixture during the extraction of aluminium is :
 
Option: 1 Kaolite
Option: 2 Cryolite
Option: 3 Calamine  
Option: 4 Bauxite

Cryolite (Na3AlF6) is added to reduce the melting point of the reaction mixture during the extraction of aluminium.

Therefore, the Correct option is (2)

View Full Answer(1)
Posted by

Kuldeep Maurya

Match List I with List II 
List - I List-II
a. Mercury i. Vapour phase refining
b. copper  ii. Distillation refining 
c. Silicon iii. Electrolytic refining
d. Nickel iv. Zone Refining
 
Option: 1 a-ii, b-iv, c-iii, d-i
Option: 2 a-i, b-iv, c-ii, d-iii
Option: 3 a-ii, b-iii, c-iv, d-i
Option: 4 a-ii, b-iii, c-i, d-iv

We know these - 

(a) Mercury --------> Distillation refining

(b) Copper --------> Electrolytic refining

(c) Silicon --------> Zone refining

(d) Nickel --------> Vapour phase refining.

Therefore, the Correct option is (3)

 

View Full Answer(1)
Posted by

Kuldeep Maurya

JEE Main high-scoring chapters and topics

Study 40% syllabus and score up to 100% marks in JEE
filter_img