Question

Pls solve this physics question

Answer 1

Answer:

displacement reaction is answer

Answer 2

Question 1 :

When 3.0 g of carbon is burnt in 8.00 g of carbon dioxide is produced. What mass of carbon dioxide will be formed when 3.00 g of carbon is burnt in 50.00 g of oxygen ? Which law of chemical combination will govern your answer ?

Answer :

Our answer will be governed by the law of constant proportions. Now,since carbon and oxygen combine in the fixed proportion of 3:8 by mass to produce 11 g of carbon dioxide, therefore, the same mass of carbon dioxide (11 g) will be obtained even if we burn 3 g of carbon in 50 g of oxygen. The extra oxygen (50 - 8 = 42 g oxygen) will remain unreacted.

Question 2 :

Write down the formula of :

• Sodium oxide
• Aluminium chloride
• Sodium sulphate
• Magnesium hydroxide

Answer :

• $\bf{Na_{2} O}$
• $\bf{AlCl_{3} }$
• $\bf{Na _{2} S}$
• $\bf{Mg(OH)_{2} }$

Question 3 :

What are polyatomic ions ? Give examples

Answer :

Those ions which are formed from group of joined atoms are called polyatomic ions.

Examples : $\bf{ NH {}^{ + } _{4} \: \: \: and \: \: \: NO{}^{ - }_{3}}$