PRACTICE TEST -2-Class 10 – Science -Chemistry -Chapter 4 – Carbon and its Compounds

In a covalent bond formation:

Ethanol reacts with sodium and forms two products. These are

An element X has 6 electrons in its outermost shell. Then the number of electrons shared by X with another atom to form a covalent bond is:

Assertion: When a hydrocarbon is combusted in air, carbon monoxide is always the major product.

When two pairs of electrons are shared, bond is

Identify the unsaturated compounds from the following

A group closely related compounds which can be expressed by a general formula & in which two consecutive members differ by 14 in their molecular masses is called:

Which pollutant gas can be produced as a result of incomplete combustion of octane (C8 H18)?

Which of the following statement(s) is/are correct?

The number of carbon compounds is very large because:

Which of the following statements are correct?

The chlorination of methane is an example of:

Which of the given statements is true?

______ is the perfectly crystalline allotrope of carbon.

An organic compound 'A' produces a gas with brisk effervescence when sodium bicarbonate is added to it. The compound 'A' contains the same number of carbons as in ethane. The compound 'A' reacts with ethanol to form a sweet-smelling compound 'C' in presence of conc.  H2SO4 acid. Then the name of compound A and the gas evolved is :

Assertion: In O/W emulsion, soap is mixed.

While cooking, if the bottom of the vessel is getting blackened on the outside, it means that:

In the presence of the acid catalyst, ethanoic acid reacts with ethanol to produce________.

Washing soaps produce scum with hard water and not much foam because hard water contains:

Which statement about bonding is not correct?