Question

P is a white crystalline solid. On heating it changes to a
yellow solid Q.A colourless gas R is evolved and a reddish-
brown gas S is also evolved.

a. Identify P,Q and S.
b. Identify the type of reaction.
c. Write the balanced chemical equation.

Answer 1

Explanation:

HERE IS YOUR ANSWER,

⇔ Well the crystalline salt is :

→ Lead Nitrate (PbNO₃)

⇔ The reddish brown gas evolved is :

→ Nitrogen Dioxide (NO₂)

This gas is evolved when lead nitrate get's oxidized to lead oxide.

Answer 2

Explanation:

the third side of triangle be x m.

Then, two equal sides of triangle =(3x-4)m

Given, perimeter of triangle =55m

∵

x

+

3

x

−

4

+

3

x

−

4

=

55

⇒

7

x

−

8

=

55

⇒

7

x

=

55

+

8

⇒

7

x

=

63

⇒

x

=

63

7

∴

x

=

9

Hence, the dimension of the triangle are 9m,

(

3

×

9

−

4

)

m and

(

3

×

9

−

4

)

m, i.e 9, (27-4), and (27-4)m, i.e. 9m, 23m, and 23m