Download App

Metals and Non-Metals — Science STD 10 — Question

CBSE BoardEnglish MediumSTD 10ScienceMetals and Non-Metals3 Marks
Question
Iqbal treated a lustrous, divalent element M with sodium hydroxide. He observed the formation of bubbles in reaction mixture. He made the same observations when this element was treated with hydrochloric acid. Suggest how can he identify the produced gas. Write chemical equations for both the reactions.
✓

Answer

The divalent element M is a metal. It reacts with both sodium hydroxide (alkali) and dilute hydrochloric acid to evolve hydrogen gas.
M(s) + 2NaOH(aq) → Na2MO2(aq) + H2(g)
M(s) + 2HCl(aq) → MCl2(aq) + H2(g)
The gas burns with a pop sound when a burning match stick is brought near it.

Need a full question paper?

Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.

Start Generating Free

Explore more

More "Answer the questions.[Che-3M]" from Metals and Non-Metals→Metals and Non-Metals — all question types→Science STD 10 question papers→CBSE Board STD 10 question papers→CBSE Board question paper generator→

Similar questions

What is a homologous series? Find the difference in molecular mass between the two consecutive members of a homologous series. State how in a homologous series of carbon compounds the following properties vary with increase in molecular mass:
a. Melting and boiling points
b. Chemical properties
→
You might have noted that when copper powder is heated in a china dish, the surface of copper powder becomes coated with a black colour substance.
  1. How has this black coloured substance formed?
  2. What is that black substance?
  3. Write the chemical equation of the reaction that takes place.
→
How can ethanol and ethanoic acid be differentiated on the basis of their physical and chemical properties?
→
Why are some of these called saturated and the other unsaturated compounds?
→
Iqbal treated a lustrous, divalent element M with sodium hydroxide. He observed the formation of bubbles in reaction mixture. He made the same observations when this element was treated with hydrochloric acid. Suggest how can he identify the produced gas. Write chemical equations for both the reactions.
→
How is ethene prepared from ethanol? Give the reaction involved in it.
→
Explain giving chemical equation, how are esters prepared? Specify any one property and one use of esters.
→
An element A burns with golden flame in air. It reacts with another element B, atomic number 17 to give a product C. An aqueous solution of product C on electrolysis gives a compound D and liberates hydrogen. Identify A, B, C and D. Also write down the equations for the reactions involved.
→
$P, Q$ and $R$ are 3 elements which undergo chemical reactions according to the following equations :
a. $P _2 O _3+2 Q \rightarrow Q _2 O _3+2 P$
b. $3 RSO _4+2 Q \rightarrow Q _2\left( SO _4\right)_3+3 R$
c. $3 RO +2 P \rightarrow P _2 O _3+3 R$
Answer the following questions :
i. Which element is most reactive?
ii. Which element is least reactive?
iii. State the type of reaction listed above.
→
An organic acid X is a liquid, which often freezes during winter time in cold countries, having the molecular formula C2H4O2. On warming it with methanol in the presence of a few drops of concentrated sulphuric acid, a compound Y with a sweet smell is formed.
  1. Identify X and Y. Also write their formulae showing the functional group present in them.
  2. Write a chemical equation for the reaction involved.
→