Preparation of Hydrogen from Steam

Q.

K + H₂O -> KOH + H₂ . How to balance this equation without hit and trial method.

Q. Aluminium reacts with oxygen to form .

1. $Al{O}_3$
2. $A{l}_2{O}_3$
3. $A{l}_3{O}_2$

Q.

Define an alloy and an amalgam. State the main constituents of the following alloys: Stainless steel, bronze. In which property is each of them different from its main constituent?

Q.

A metal used for making bullets?

Q. On heating(Strong) the mixture of powdered iron and copper(||) oxide in a crucible:
(A)formation of iron(||)oxide and copper takes place
(B)formation of copper(|||)oxide and iron(||)oxide takes place (C)no reaction takes place

Q.

Which chemical element is alloyed with Copper to make Bronze?

Q. Which of the following non-metals reacts and catches fire on exposure to air?​

1. phosphorus
2. nitrogen
3. sulphur
4. hydrogen

Q.

Fill in the blanks with the right words given within the brackets:

Metals are _________ while non-metals are ________ of heat.

Q.

Name the alloy whose constituents are iron, nickel, and chromium.

Q. Why alloys are preferred over metals?

Q.

Give reasons why copper is used to make hot water tanks and not steel (an alloy of iron).

Q. A few milligrams of Iron [II] chloride was left exposed to air. It was observed that there was a change in its appearance, and gain in its weight.
What change in appearance is observed?
Why is there a gain in weight?

Q.

An alloy of Pb and Sn in equal proportion is called

1. solder

2. type metal

3. constantan

4. gun metal

Q.

What is an alloy? Name the alloy which has copper, nickel, and zinc as its constituents. What is the main use of this alloy?

Q.

Give three practical applications of good conductors

Q.

Name the substances that take part in a chemical reaction.

Q.

The substance that takes part in a chemical reaction is known as

1. Reactant

2. Product

3. Equation

4. Both A and B

Q. Which of the following metals is not in solid state at room temperature?

1. Mercury
2. Sodium
3. Aluminium
4. Silver

Q.

Name the main constituent metal in the following alloy?

Stainless steel

Q.

Name a metal nitrate which on heating changes into a metal.

Q.

A light and strong alloy is required for making the bodies of aircrafts. What should be its constituents?

Q. What is obtained when a metal oxide of the highly reactive metals react with water?

1. metal carbonate
2. metal hydroxide
3. pure metal
4. They do not react with each other.

Q.

Addition of __________ [antimony/tin/German silver/bell metal/brass] to lead lowers the melting point of the alloy solder.

Q. Aluminium reacts with "X" to form aluminium oxide. Identify the element "X".

1. Hydrogen
2. Ozone
3. Oxygen
4. Water

Q.

The two main metals in Bronze are:

1. Copper and zinc

2. Copper and lead

3. Copper and nickel

4. Copper and tin

Q.

How does formation of alloys improve the properties of metals?

Q. Aluminium reacts with "X" to form aluminium oxide. Identify the element "X".

1. Water
2. Hydrogen
3. Oxygen
4. Ozone

Q.

Why do we need alloys?

Q.

Write one typical use of the following:

Mercury

Q. Which of the following metals is not in solid state at room temperature?

1. Silver
2. Sodium
3. Aluminium
4. Mercury