Assertion : Plumbago is an allotropic form of lead. Reason: in Roman, lead is called Plumbum.

Monjur Alahi

Assertion : Plumbago is an allotropic form of lead.
Reason: in Roman, lead is called Plumbum.
A. Both A and R are true and R is the correct explanatoin of A
B. both A and R are true but R is the correct explanation of A
C. A is true but R is false
D. A is false but R is true


0 like 0 dislike
1 views
Share with your friends

1 Answers

Salim Ahmed Kawsar

Call

Correct Answer - D
Assertion: Plumbago is another name of graphite like lead, graphite also marks paper.

0 like 0 dislike
1 views
Talk Doctor Online in Bissoy App
In which allotropic form of sulphur, puckered `S_8` rings are not present ?

Correct Answer - A Plastic sulphur contains irregular chains of sulphur atoms.

2 Answers 1 views
Given below are assertion and reason. Point out if both are ture and reason is correct explanantion (A), both true but reason is not correct explanati

Correct Answer - B Cenozoic/Caenozoic. Geolocial era that began 65 million years ago. Marked by emergence of Himalayas and Alps, and spred of mammals.

2 Answers 1 views
Which out of the following oxides of lead finds use in lead accumulator ?

Correct Answer - D In lead accumulator, cathode is a grid of lead packed with `PbO_(2)`

2 Answers 1 views
Lead can be cut with knife and scratched with finger nail. Which property depicts this quality in lead ?

Correct Answer - C Lead can be cut with a knife and scratched with finger nail, as lead is quite soft.

2 Answers 1 views
An oxide of lead which is used in lead storage batteries, in safety matches and is a powerful oxidising agent is

Correct Answer - B `PbO_(2)` is used in lead storage batteries, in safety matches and is a powerful oxidising agent.

2 Answers 1 views
Assertion : The man who fits or fixes water pipes in our homes etc. is called a plumber Reason: Pipes used for carrying water were made up of lead at

Correct Answer - A Both assertion and reason are correct . Lead is called plumbum in Roman

2 Answers 1 views
Assertion (A) All collision of reactant molecules lead to product formation. Reason (R) Only those collisions in which molecules have correct orientat 2 Answers 1 views
Main ore of lead is gaalena.This is mined and separated from other minerals by froth flotation.There are two methods of extracting the lead. (i)First

Correct Answer - C `3PbS+3O_2 (air) to PbS+2PbO+2SO_4`

2 Answers 1 views
Ozone is triatomic allotropic form of oxygen.It is an unstable , dark blue diamagnetic gas, `O_3` is thermodyanamically unstable and decomposes to `O_

Correct Answer - B `2KOH+5O_3 to 2KO_3`(orange coloured ) +`5O_2 +H_2O`

2 Answers 1 views
Some question (Assertion-Reason type) are given below. Each question contains STATEMENT-1(Assertion) and STATEMENT-2(Reason) . Each question has 4 cho

Correct Answer - D A body can float into liquid even if the density of liquid is less then the density of solid.

2 Answers 1 views
X