Chemistry-

General

Easy

### Question

#### The enthalpy change for there action 2C(graphite)+3H2(g)→C2H6(g)is called–

- Enthalpy of formation
- Enthalpy of combustion
- Enthalpy of hydrogenation
- Enthalpy of vaporisation

#### The correct answer is: Enthalpy of formation

## Book A Free Demo

+91

Grade*

Select Grade

### Related Questions to study

chemistry-

#### This reaction is called

#### This reaction is called

chemistry-General

chemistry-

#### Which of the following is a nonreducing sugar?

#### Which of the following is a nonreducing sugar?

chemistry-General

chemistry-

#### Which of the following aldohexoses give the same osazone derivative ?

#### Which of the following aldohexoses give the same osazone derivative ?

chemistry-General

chemistry-

#### Observe the following laboratory tests for a–D(+) glucose and mention +ve or –ve ion from the code given below

#### Observe the following laboratory tests for a–D(+) glucose and mention +ve or –ve ion from the code given below

chemistry-General

chemistry-

#### The correct functional group X and the reagent/reaction conditions Y in the following scheme are

#### The correct functional group X and the reagent/reaction conditions Y in the following scheme are

chemistry-General

chemistry-

#### The following carbohydrate is

#### The following carbohydrate is

chemistry-General

chemistry-

#### The correct statement(s) about the following sugars X and Y is(are) :

#### The correct statement(s) about the following sugars X and Y is(are) :

chemistry-General

physics-

#### A copper rod of length L and radius ris suspended from the ceiling by one of its ends. What will be elongation of the rod due to its own weight when are the density and Young’s modulus of the copper respectively?

The weight of the rod can be assumed to act at its mid-point.

Now, the mass of the rod is

⟹

Here,

Now, we know that the Young’s modulus

⟹

or

On putting the value of

or

Now, the mass of the rod is

⟹

Here,

*L*= length of the rod.Now, we know that the Young’s modulus

⟹

or

On putting the value of

*M*from Eq.(i), we getor

#### A copper rod of length L and radius ris suspended from the ceiling by one of its ends. What will be elongation of the rod due to its own weight when are the density and Young’s modulus of the copper respectively?

physics-General

The weight of the rod can be assumed to act at its mid-point.

Now, the mass of the rod is

⟹

Here,

Now, we know that the Young’s modulus

⟹

or

On putting the value of

or

Now, the mass of the rod is

⟹

Here,

*L*= length of the rod.Now, we know that the Young’s modulus

⟹

or

On putting the value of

*M*from Eq.(i), we getor

physics-

#### The value of force constant between the applied elastic force and displacement will be

Force constant, K

#### The value of force constant between the applied elastic force and displacement will be

physics-General

Force constant, K

physics-

#### A student plots a graph from his reading on the determination of Young’s modulus of a metal wire but forgets to label. The quantities on and axes may be respectively

#### A student plots a graph from his reading on the determination of Young’s modulus of a metal wire but forgets to label. The quantities on and axes may be respectively

physics-General

physics-

#### If the ratio of lengths, radii and Young’s modulus of steel and brass wires shown in the figure are and , respectively. The ratio between the increase in lengths of brass and steel wires would be

Given,

Let Young’s modulus of steel be , and that of brass be

(i)

and (ii)

Dividing Equation (i) by Equation (ii), we get

(iii)

Force on steel wire from free body diagram

Newton

Force on brass wire from free body diagram

Newton

Now, putting the value of in Equation (iii), we get

Let Young’s modulus of steel be , and that of brass be

(i)

and (ii)

Dividing Equation (i) by Equation (ii), we get

(iii)

Force on steel wire from free body diagram

Newton

Force on brass wire from free body diagram

Newton

Now, putting the value of in Equation (iii), we get

#### If the ratio of lengths, radii and Young’s modulus of steel and brass wires shown in the figure are and , respectively. The ratio between the increase in lengths of brass and steel wires would be

physics-General

Given,

Let Young’s modulus of steel be , and that of brass be

(i)

and (ii)

Dividing Equation (i) by Equation (ii), we get

(iii)

Force on steel wire from free body diagram

Newton

Force on brass wire from free body diagram

Newton

Now, putting the value of in Equation (iii), we get

Let Young’s modulus of steel be , and that of brass be

(i)

and (ii)

Dividing Equation (i) by Equation (ii), we get

(iii)

Force on steel wire from free body diagram

Newton

Force on brass wire from free body diagram

Newton

Now, putting the value of in Equation (iii), we get

chemistry-

#### Salicin (structure given below) is a glycoside, found in the bark of willow tree, used in relieving pain. Observe the following reaction of salicin

The correct statement (s) is (are) :

#### Salicin (structure given below) is a glycoside, found in the bark of willow tree, used in relieving pain. Observe the following reaction of salicin

The correct statement (s) is (are) :

chemistry-General

physics-

#### Which one of the following is the Young’s modules (in for the wire having the stress-strain curve shown in the figure

Young’s modulus is defined only in elastic region and

#### Which one of the following is the Young’s modules (in for the wire having the stress-strain curve shown in the figure

physics-General

Young’s modulus is defined only in elastic region and

physics-

#### The diagram shows the change in the length of a thin uniform wire caused by the application of stress at two different temperatures and . The variation shown suggest that

Elasticity of wire decreases at high temperature at higher temperature slope of graph will be less

So we can say that

So we can say that

#### The diagram shows the change in the length of a thin uniform wire caused by the application of stress at two different temperatures and . The variation shown suggest that

physics-General

Elasticity of wire decreases at high temperature at higher temperature slope of graph will be less

So we can say that

So we can say that

chemistry-

#### IfΔHf ofICl(g),Cl(g),andI(g)is17.57,121.34and 106.96Jmol–1respectively.Thenbonddissociation energyofIClbondis-

#### IfΔHf ofICl(g),Cl(g),andI(g)is17.57,121.34and 106.96Jmol–1respectively.Thenbonddissociation energyofIClbondis-

chemistry-General