Properties of Bases

Q. Metal oxides react with water to form .

1. acids
2. bases
3. salts

Q. Baking soda is ________ in taste.

1. bitter
2. sour
3. salty
4. sweet

Q. A solution of ________ is formed when the white ash formed by burning magnesium ribbon is dissolved in water.

1. magnesium hydroxide
2. magnesium oxide
3. magnesium chloride
4. magnesium carbonate

Q. What is the basic difference between the baking soda and baking powder?

1. Baking powder contains baking soda mixed with tartaric acid
2. Baking soda contains baking powder mixed with tartaric acid
3. No difference
4. Baking soda contains baking powder mixed with tartaric acid and sometimes cornstarch

Q. When a non-metal reacts with oxygen, it forms a non-metallic oxide. This non-metallic oxide when reacted with $H_{2}O$, form a substance, ‘X’ with pH value less than 7. What is the nature of X ?

1. Neutral
2. Basic
3. Acidic
4. Salt

Q. Bases are soapy to touch and sour in taste.

1. True
2. False

Q. Substances containing bases are in taste and to touch.

1. bitter
2. sticky
3. slippery
4. sour

Q.

A colourless liquid turns blue litmus paper into red and reacts with magnesium to produce a gas. What is the colourless liquid ?

Q.

Fill in the blanks.

Magnesium + ____________ $\to$Magnesium oxide.

Q. A popular metal X reacts with oxygen gas to give an amphoteric oxide. Identify the metal X. (amphoteric oxides show both acidic and basic behaviour).
$X+O_2\to \text{Amphoteric Oxide}$

1. Na (Sodium)
2. C (Carbon)
3. Al (Aluminium)
4. K (Potassium)

Q. Consider the following statements.

Statement 1: Bases are sour in nature.
Statement 2: Bases are soapy to touch.

1. Both statements are true.
2. Both statements are false.
3. Only statement 1 is true.
4. Only statement 2 is true.

Q. In the reaction given below, M is an alkali metal which reacts with oxygen and gives X. Select a suitable option pertaining to the product X.
$M\left(Metal\right)+O_2$ $\to X\left(Metaloxide\right)$

1. Acidic oxide
2. Basic oxide
3. Amphoteric oxide
4. Salt

Q.

Everything that is a base need not be an alkali.

1. True

2. False

Q. What is sodium oxide + water?

Q.

A green coloured chromium compound A on fusion with alkali gives a yellow compound B which on acidification gives an oragne compound C which reacts with NH4Cl to form orange compound D . D on heating gives A back . identify A, B, C, D and give reactions

Q. Alkalis

(a) have sour taste
(b) are soluble in water
(c) turn blue litmus red
(d) have all of these properties