Advertisements
Advertisements
प्रश्न
A basic oxide will be formed by the element ______.
विकल्प
K
S
P
Kr
Advertisements
उत्तर
A basic oxide will be formed by the element K.
Explanation:
Potassium (K) is an alkali metal, and metals characteristically react with oxygen to form basic oxides. When potassium oxide (K2O) dissolves in water, it produces a strong base called potassium hydroxide (KOH). Conversely, Sulphur (S) and Phosphorus (P) are non-metals that form acidic oxides, while krypton (Kr) is an unreactive noble gas.
APPEARS IN
संबंधित प्रश्न
Metal A has electronic configuration (2, 8, 1) and metal B has (2, 8, 8, 2). Which is more reactive? Why? Identify these metals.
Write equations for the reactions of iron with steam.
Show the formation of Na2O by the transfer of electrons.
A student added few pieces of aluminium metal to two test tubes A and B containing aqueous solutions of iron sulphate and copper sulphate. In the second part of her experiment, she added iron metal to another test tubes C and D containing aqueous solutions of aluminium sulphate and copper sulphate.
In which test tube or test tubes will she observe colour change? On the basis of this experiment, state which one is the most reactive metal and why.
State whether the following statement is true or false:
Non-metals react with dilute acids to produce a gas which burns with a ‘pop’ sound.
Name two metals (other than zinc and iron) which can displace hydrogen from dilute hydrochloric acid?
You are given samples of three metals - sodium, magnesium and copper. Suggest any two activities to arrange them in order of their decreasing reactivities.
What happens when calcium reacts with water? Write the chemical equation of the reaction of calcium with water.
Write the chemical equation of the reaction which takes place when iron reacts with dilute sulphuric acid. What happens when the gas produced is ignited with a burning matchstick?
Write the equation for the reaction of:
Iron with dilute hydrochloric acid.
Name the products formed in the given case. Also indicate the physical states of all the substances involved.
The elements whose oxides can turn phenolphthalein solution pink are ______.
An element E reacts with water to form a solution which turns phenolphthalein solution pink. The element E is most likely to be:
(a) S
(b) Ca
(c) C
(d) Ag
Which one of the following four metals would be displaced from the solution of its salt by the other three metals?
(a) Zn
(b) Ag
(c) Cu
(d) Mg
In a solution of lead acetate, a strip of metal M was dipped. After some time, lead from the solution was deposited on the metal strip. Which metal is more reactive, M or lead?
Calcium floats over water during the reaction with water. Give reason.
Answer the following question:
An element X on reacting with oxygen forms an oxide X2O. This oxide dissolves in water and turns red litmus blue. State whether element X is metal or a non - metal. Explain with a proper example.
Explain the following:
Reactivity of aluminium decrease if it is dipped in nitric acid.
Aluminium is used for making cooking utensils. Which of the following properties of aluminium are responsible for the same?
(i) Good thermal conductivity
(ii) Good electrical conductivity
(iii) Ductility
(iv) High melting point
An alkali metal A gives a compound B (molecular mass = 40) on reacting with water. The compound B gives a soluble compound C on treatment with aluminium oxide. Identify A, B and C and give the reaction involved.
Which of the following property is not responsible for copper to be used as electrical conduction wires?
