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Chemistry - Science Questions asked by Filo students

Views: 5,767

Which of the following does not represent electrical power in a

$VI$
$R^{2}$

Topic:

Chemistry

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Views: 5,738

Which among the following is (are) double displacements reactic (i)

Pb + CuCl_{2} ⟶ PbCl_{2} + Cu

C + O_{2} ⟶ CO_{2}

(i) and (iv)
(i) and (ii)

Topic:

Chemistry

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Views: 5,532

Which one of the following types of medicines is used for treatin

Antibiotic
Anạg
Antacid
Antise

Topic:

Chemistry

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Views: 5,258

Queation In the given figure Suppose the resistore

R_{1}, R_{2}, R_{3}

heve the katus of \ 5 \Omega, 10 \Omega, 30 \Omega

ros p a t i v a l y, Whi c hh or ib u eco nn e tt o ba tt oryo f

12 \mathrm{~V}$. Whalate al. Curoent through ach Raistor bic Ioted arownt in the incuit Q6 total irvout rovitume

Topic:

Chemistry

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Views: 5,328

Which of the following is not mention in the four players in criminal justice system?

Police
Villagers
Judge
Defence lawyer

Topic:

Chemistry

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Views: 5,074

8. Explain with examples (i) Atomic number, (ii) Mass number. (iii) Isotopes and iv) Isobars. Give any two uses of isotopes. 9.

Na^{*}

has completely filled

K

L

shells. Explain. 10. If bromine atom is available in the form of, say, two isotopes

_{35}^{79} Br (49.7%)

^{81} Br (50.3%)

. calculate the average atomic mass of bromine atom.

Topic:

Chemistry

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Views: 5,463

Explain the nature of the covalent bond using the bond formation in

CH_{3} Cl

. 5. Draw the electron dot structures for

ethanolcacid.
$H_{2} S$ .
propanone.
$F_{2}$ .

Topic:

Chemistry

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Views: 5,627

218 series of alkenes. We are now in a position to answer the following questions :

Give the general name of the class of compounds having the general formula $C_{n} H_{2 n - 2}$ . Write name of the first member of this homologous series.
What is a homologous series ? Explain with an example.
State two characteristics of a homologous series.
What is the difference between two consecutive homologues :

Topic:

Chemistry

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Views: 5,809

in terms of molecular mass ? (ii) in terms of number and kind of atoms per molecule?

Complete the following statement :

Topic:

Chemistry

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Question 10

Views: 5,764

218 series of alkenes. We are now in a position to answer the following questions :

Give the general name of the class of compounds having the general formula $C_{n} H_{2 n - 2}$ . Write name of the first member of this homologous series.
What is a homologous series ? Explain with an example.
State two characteristics of a homologous series.
What is the difference between two consecutive homologues :

Topic:

Chemistry

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Question 11

Views: 5,080

in terms of molecular mass ? (ii) in terms of number and kind of atoms per molecule?

Complete the following statement :

Topic:

Chemistry

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Question 12

Views: 5,671

Which of the following is a capionic detergent?

Sodium Lauryl sulphate.
Sodium stearate
celyltrimathyl ammonlum bromide
Sodium bobecyl - ben zene Sulphonate

Topic:

Chemistry

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Question 13

Views: 5,149

(c) propanone. (d)

F_{2}

. 6. What is an homologous series? Explain with an example.

Topic:

Chemistry

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Question 14

Views: 5,757

4.2 The Structure of an Atom We have learnt Dalton's atomic theory in Chapter 3 , which suggested that the atom was indivisible and indestructible. But the discovery of two fundamental particles (electrons and protons) inside the atom, led to the failure of this aspect of Dalton's atomic theory. It was then considered necessary to know how electrons and protons are arranged within an atom. For explaining this, many scientists proposed various atomic models. J.J. Thomson was the first one to propose a model for the structure of an atom.

Topic:

Chemistry

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Question 15

Views: 5,884

PRACTICE PAPER - II SCIENCE X Time Allowed: 3 hours Maximum Marks: 80 SECTION Á (IVCQS)(1 IVARRS) 1. A student was given four unknown colorless samples labeled

A, B

C

, and D asked to test their Ph by using

pH

paper, he observed that the colour of

pH

paper turned to Red, Blue, Green and Orange respectively when dipped in four solutions. The correct conclusion made by student would be that:

I, II, and III are acidic
I and IV are acidic
II, III IV are basic
II and IV are basic

Topic:

Chemistry

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Question 16

Views: 5,701

Few drops of lemon juice are poured over solid sodium carbonate, when lot of effervescencetakesplace with the volutionof acolorlessgas. Thegasevolvedis

Carbon dioxide
Hydrogen
Carbon monoxide
Methane

Topic:

Chemistry

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Question 17

Views: 5,556

In order to prepare a temporary mount of a leaf peel for observing stomata, the chemicals used for staining and mounting respectively are

Saffranin and Glycerine
Iodine and Glycerine
Iodine and Saffranin
Glycerine and Saffranin

Topic:

Chemistry

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Question 18

Views: 5,642

In the explaining to prove that carbon dioxide is liberated during respiration, what is the role of

KOH

To.absorb water
To absorb $CO_{2}$ and create partial vacuum in the flask
To release water
To release the energy required by the Germinating seeds

Topic:

Chemistry

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Question 19

Views: 5,270

4.2.1 THOMSON's MODEL OF AN ATOM Thomson proposed the model of an atom to be similar to that of a Christmas pudding. The electrons, in a sphere of positive charge, were like currants (dry fruits) in a spherical Christmas pudding. We can also think of a watermelon, the positive charge in the atom is spread all over like the red edible part of the watermelon, while the electrons are studded in the positively charged sphere, like the seeds in the watermelon (Fig. 4.1). Fig.4.1: Thomson's model of an atom Structure of the Atom

Topic:

Chemistry

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Question 20

Views: 5,222

Butanone is a four-carbon compound with the functional group

carboxylic acid.
aldehyde.
ketone.
alcohol.

Topic:

Chemistry

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