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Which of the following trend shows the electron affinity values for the halogens?

Those reactions in which oxidation and reduction takes place simultaneously are known as

Which of the following elements has the highest electronegativity?

Which of the following property is generally not shown by metals?

Draw the electron dot structures of the following compounds and state the type of bonding in each case:
(i) $C{O}_2$

(ii) $MgO$

(iii) $H_{2}O$

(iv) $HCI$

(v) $MgC{l}_2$

The atomic numbers of three elements A, B and C are given below :

Element Atomic number

A 5

B 7

C 10

(i) Which element belongs to group 18? (ii) Which element belongs to group 15?

(iii) Which element belongs to group 13? (iv) To which, period/periods do these elements belong?

The formula of baking soda is :

(a) $K_{2}C{O}_3$

(b) $KHC{O}_3$

(c) $NaHC{O}_3$

(d) $KN{O}_3$

The number of isomers formed by the hydrocarbon with molecular formular $C_5{H}_{12}$ is :
(a) 2 (b) 5 (c) 3 (d) 4

An element which is an essential constituent of all organic compounds belongs to the following group of the modern periodic table :

(a) group 4 (b) group 14 (c) group 15 (d) group 16

What is formed during the fermentation of glucose?

A white amphoteric oxide reacts with sodium hydroxide to give sodium zincate and water. Name this amphoteric oxide.

Which one of the following is employed as an antihistamine?

Identify the name of the process that is used to obtain pure water for industrial purpose.

What is Calcination? Write two uses of it? [3 MARKS]

Which of the following represents a double displacement reaction?

Write the chemical name and formula of (a) common salt, and (b) caustic soda.

Uses of ammonia in daily life

Which of the following graphs is correct for a zero order reaction?

Which of the following is an explosive produced by sulphuric acid?

The correct order of increasing energy of atomic orbitals is

A compound whose molecules are superimposable on their mirror images even though they contain an assymetric carbon atom is

Mam/sir how we will get to know that how many structural isomers should be drawn for a particular compound ?

What is a synthesis reaction ?

The bond dissociation energy of H-H, C-C,C-H bonds respectively are 104.2, 83.1 and 98.8kcal/mole . The electronegative of c is?

When drops of blue litmus solutions are added to dil. HCl and aqueous NaOH taken in two different test tubes A and B respectively, what will be the colour changes occurring?

Why does the blue colour of copper sulphate solution changes to green colour when an iron nail is dipped in it ? Write chemical equation.

Question 10
The flow of energy in an ecosystem is always

(a) unidirectional
(b) bidirectional
(c) multi directional
(d) no specific direction

Why covalent bond attracted to each other ever they don't have ions

When ammonium hydroxide is added to solution B, a pale blue precipitate is formed . This pale blue precipitate dissolves in excess of ammonium hydroxide giving an inky blue solution. Name the cation present in solution B.

Is glucose an acid, or a base? Do it dissociate ?

End product in this reaction is $CHCH+HBr\to X\stackrel{KOH}{\to }$

What if francium reacts with water???

Why was the system of classification of elements into triads not found suitable?

In the calcination process, the type of reaction taking place is _____ .

Question 17.
Which one of the following can be used as an acid-base indicator by a visually impaired student?
(a) Litmus
(b) Turmeric
(c) Vanilla essence
(d) Petunia leaves

Electrons are _____ particles.

Match the four starting meterials (P, Q, R, S) given in List – I with the corresponding reaction schemes
(I, II, III, IV) provided in List – II and select the correct answer using the code given below the lists.
$\begin{array}{cc}P.Zn& 1.Self-reduction\\ Q.Cu& 2.Pyrometallurgy\\ R.Pb& 3.Bessemerisation\\ S.Fe\left(steel\right)& 4.Roasting\end{array}$

Which amongst the following molecules contains the maximum number of hydrogen atoms in it?

Why corrosion always happen layer by layer ?

X is an intermediate between suspension and solution. It is also a homogeneous looking like heterogeneous mixture in which particles have size between 1nm to 100nm. Name X.