Explore topic-wise InterviewSolutions in Current Affairs.

Which of the following is the correct decreasing order of atomic radius for following elements?
B, Al, Ga, In

Which of the following alloy has copper as its constituent?

Fill in the following blanks with suitable words:
(a) Magnesium liberates ........ gas on reacting with hot boiling water.
(b) The white powder formed when magnesium ribbon burns in oxygen is of...
(c) Ordinary aluminium strips are not attacked by water because of the presence of a layer of ....on the surface fo aluminium.
(d) A metal having low melting point is ... but a non-metal having very high melting point is ...
(e) Calcium is .... reactive metal than sodium.

In stainless steel alloy, iron metal is mixed with:
(a) Cu and Cr (b) Cr and Ni (c) Cr and Sn (d) Cu and Ni

What would you observe in the following case?

When carbon monoxide is passed over heated copper oxide.

On 2nd February, 2016, A purchased from B goods for Rs. 17,500. A paid Rs. 2,500 immediately and for the balance gave a promissory note to B, payable after 60 days. B immediately endorsed the promissory note in favour of his creditor C for the full settlement of a debt of Rs. 15,400. On the due date of the bill, C presented the bill to A, which the latter dishonoured and C paid Rs. 50 as noting charges. On the same date, C informed B about the dishonour of the bill and B immediately settled his debt to C by cheque for Rs. 15,050 which includes noting charges. A settled B's claim by cheque for the same amount. Record the necessary journal entries in the books of B.

(a) Do basic solutions also have $H^{+}$ (aq) ions? If yes, then why are they basic?

(b) When a solution becomes more acidic, does the pH get higher or lower?

Which of the following metals can we cut with a knife?

Painting a wooden block or wall is a chemical change or not as there is a change in colour?

Which gases are evolved in the thermal dissociation of nitric acid?

$\text{A + B}\leftrightharpoons \text{C + D}$

The above reversible reaction is in equilibrium. What will be the effect on chemical equilibrium if the concentration of D is decreased in the system?

An important fertilizer produced by sulphuric acid industrially is :

what is the reaction of a non-metallic oxide with base?

Arrange F, Cl, O, and N in the decreasing order of electronegativity.

Why carbon atom cannot lose or gain electron to form octet

1. Write the name and chemical formula of the main product formed by heating baking soda

People use a variety of methods to wash cloth. Usually, after adding soap,they 'beat' the clothes on a stone or beat it with a paddle scrub with a brush or agitate the mixture in a

washing machine .Why is this agitation neccessary to get clean clothes?

Alloying is not done for which of the following purpose?

(a) What is meant by (i) a group, and (ii) a period, in a periodic table?

(b) How many periods and groups are there in the long form of the periodic table?

(c) Give two examples each of (i) group 1 elements (ii) group 17 elements (iii) group 18 elements.

What is the chemical formula of (a) baking soda, and (b) washing soda ?

The salt that forms neutral solution in water is

(a) What happens when dilute hydrochloric acid is added to sodium carbonate ? Write a balanced chemical equation of the reaction involved.

(b) Which gas is liberated when dilute hydrochloric acid reacts with sodium carbonate ? How will you test for the presence of this gas ?

The daffodil plants grow best in a soil having a pH range of 6.0 to 6.5. If the soil in a garden has a pH of 4.5, which substance needs to be added to the soil in order to grow daffodils?

(a) salt

(b) lime

(c) sand

(d) compost

Fill in the following blanks with suitable words :
(a) The next higher homologue of ethanol is ___
(b) The next homologue of $C_2{H}_{5}OH$ is ___
(c) The next higher homologue of ethane is ___
(d) The functional group present in ethanol is ___
(e) Organic compounds having $-\stackrel{O}{\stackrel{||}{C}}-OH$ functional group are known as ___

The gram molecular mass of water is 18 g. The number of water molecules present in 60 g of water is:

Consider the food chain: $Grass\to Deer\to Lion$ What will happen if all the lions are removed from the above food chain?

What volume of Butane is burnt for every $1000c{m}^3$ of air used in the reaction under the same conditions.

Statement 1: Concentrated sulphuric acid reacts with metals and oxidises them.

Statement 2: Concentrated sulphuric acid reacts with non-metals and reduces them.

A __ is a substance which changes the rate of a chemical reaction without itself undergoing any chemical change.

Metals are arranged in the electrochemical series based on the ease with which atoms of metals __ (lose/gain) electrons to form positively charged ions.

In a physical change, which of the following takes place?
(i) No new substance is formed.
(ii) The change is reversible
(iii) The change is temporary

In the contact process, $S{O}_3$ is dissolved in concentrated Sulphuric acid to produce:

The two metals which are extracted by means of electrolytic reduction of their molten salt are:
(a) magnesium and manganese (b) iron and aluminium
(c) zinc and magnesium (d) magnesium and aluminium

The number of carbon atoms inthe organic compound name as 2, 2-dimethylpropane is :
(a) two (b) five (c) three (d) four

Na⁺ is smaller than Na atom because:

__is the gradual destruction of materials by chemical reaction with their environment.

The amount of energy released when a neutral gaseous atom gains one electron is called__.

What is isomer? Is this means similar to allotropes?

Balance the following equation

Al+HCl gives AlCl₃+H₂

24 cc Marsh gas $\left(C{H}_4\right)$ was mixed with 106 cc oxygen and then exploded. On cooling. The volume of the mixture became 82 cc, of which 58 cc was unchanged oxygen.
Which law does this experiment support?
Explain with calculation.

How to rember chemical equations?

The correct ground state configuration of Phosphorus is:

What happens when zinc react with hot and concentrated KOH?

A salt can be between produced by reacting